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tho Arctio Soa, excep Caloneis fossilis and an Libellus. Sevorat of tho species may even o considerei charao turistioto that ea, vi g. Navicula distans, Achnanthes arctica, Syne trahamischatica, oscinodiScus curvativu8, Odostra glacialis, an lothors It is thus obvious that tho strata in quoslion avo boon oposited by the Arctio ea at an pocli, heia that basin proad ver partes of tho present a relen, hieli pocli probabi was that of the old Aneylus-Sea. In tho introduction of his Diatonis of inlunii, P. T. CLEVE enumerates the leni in formes of Somo natura asSociation o dialoms, characterisin different conditions os climate and water, specintly uter o more Orcies salini ty. V thoro finii the association o brachish ater, o livingalong tho Balti coasis of inland whiel provos o have some species, uel as Epithemia tur9id Var. Festerniannii, Melostra orreri, Coscinodiscus alticus, Campylodiscus Clypeus and C. Echineis in common illi ho fossi flora of tho Lito-rma-deposits By the ricli development of other species, Such
the alter, o ever, ear appea rence of havinitive in amater of greater Salinity, Such a is no present in the most Aouthern par of the Ballio. To hos euological associationes, e an no ad One, that a b calle the marine-arcti formation. It ContainS,among many ther Species of intoms, tho followiti more
abundantly Diploneis plendida GREG. Cocconeis clitellum HB.
Trachyneis asper ΕΗΒ. Campylodi8cus angularis GREG. Pi inularia quadratarea A. S. C. huretii BREB. Amphora Proteus GREG. Nitzschi marginulata GRUN.A. Perroris HB. N. Olaris GRUN.
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Grammotophora arcuata EHB. G. marina . macilenta . M. G. hyalina n. P.
C. subbulliens JGRG. C. lacustris var. ly 4eptentrionalis GRUN. MoreΟVer, a number os form cloari illustrato tho arcticorigine, though usuali present ni in re sew, cattere orisolate Specimens Thos specios may have been introduce lavit l, tho arctio ater, illiser cantii represente i rom hebeginning or later on ocimaled on account of no havingsound the condition necessar for further development. Such are Caloneis aemula A. S.). Navicula directa . M. N. hariana GRUN. N. gelida GRUN. N. distans W. M. . N. glacialis L. N. glaciali Var. Septentrionalis
Amphora polaris OSTR. Achnanthes polaris OSTR. A. eptentrionalis OSTR. Synedra amischatica GRUN. Grammatophora arctica L. Sceptroneis stemmata GRUN. Coscinodiscus hyalinus GRUN. C. ubtilis var glacialis GRUN. There S on the whole, a great resemblance belweon this formation and the lora of tho Arcti Sua, numerate i in therespective ork by LEVE GRUNo an OSTRUP. Ii e no compare illese old arcti dupostis illi thesaltwateritora that immigrato to tho orthurn alti fromtho ouili duriti tho Litorina-opoch, se in that the fol-lowin species oecur abundanti in both
Rhoicosphenia urbata. Cocconeis cutellum.
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Diploneis Smithii and Ma/toyloia elliptica have been found
in neW, ver large varieties. The fossit, arcti form os Hyalodiscus stelliger und of Rhabdonem arcuatum ure Considerabi largor than the fame species in the Litorina ea orno liviri ut the os coas of weden Together With Rhab- donem minutum, o avo the gigantio Rh. Oeεtrupit in tho
By the richo flora by the occurrene O many SpecieStachin in deposit fro the Litorina-epoch, by the absenoe O Somo characteristio Litorinai -formes and finalty by theoiton luxuriant development of the SDecies, it cloe not generallyoffer an difficultius to distinguisti associationes of fossit, marino latomes, deposite in the inland of o-da duringa early-quaternar tranSgression of the Arctic ea, rom thoilora, importe at a lator perio by the ater of tho Lito-
As to the systematic arrangemon I have followed forthe naviculoid formA, LEVE' Synopsis, an for the est SCΗ0ΤΤ' monograph in Di Naturlichen Pilangonia milion, by ΝGLER RΑΝΤΙ , pari I, 6 p. 55-57, with the alterations propoSed by OSTRU in Dansho latomsier. The geographical distribution of the species an varietios bella o great importano for the elucidatior of the geological conditions under hicli the latomacoous strata have been depositod, I have endes uoured to tuo an account of the habitat and the area os auli form. The datas sed aveboen furnished, a to tho Naviculoid forms by CLEvΕ's Synopsis, complete Willi Statomenis, given in tho later papers by risΤRUP. As to the remaining Pennatae and the Centricae, my data re, o dolabi, ver incomplete, Sine I have been provented rom ack of timo to athor at tho notices Soattere in numerou Paper ora the subjeci. A far a thopelagi forins are concerned, oKever, the troatis givon byM GRAN in Nordisches Plankion III, p. 19, has been consulte l. I have also noticuit tho indications ive in hovarious orti by LEVE GRUNOW ar OSTRUP, mentioned
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Abbreviations os localities, sed in the lallowing
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fine, parallel, abola 2 in 10 11 longitudina lino indistinct. On acti id of the valve, therocis a long and narro mari ing
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caloneis fossilis n. p. - l. . . . - Syn. Navicula consimilis A. S. Perag. D. France ab . , . . Valvo linear illi cuneate, acute en is, about si times
longe than road Longili brea illi I p. Axia areabroad , abolit , of the readth of the valve, attenuate lioward tho ends Centra area a broad transverse fascinwith two aint, corroded elongate marking on both idos of tho centra nodule Striae parallel, I in 10 1, eroSSed by an indistinet, marginal, longitudina line. Foss. Kk. KnjGAha, rare mar.)Distr. Baleario Si This species is et characterised an different rom C. consimilis by tho broad axia area It comes probabi nectrio Caloneis late asciat GRUN. A. D. Tab. 1 f. 21 fro the Arctio ea, a forin that has simila mari ing round the centralnodulo, ut diffsersintho latsera areas and thoiroad rounde lendS. There is also a genera resemblance With anicula Pinnulariar mesoleta, draWn by LEV in . R. D. Tab. 2 f. 26 b. This species, however, is state by LEVE himself tot identicat illi Pinnularia molaris GRUN. Syn, Nav. D. I. . l). Nevertheless, tho origina draWin Shows ather divergent striae in tho end of the valvu an atroad axia area, hilo
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Scoliotropis septentrionalis . Sp. - l. I, . . Valve bros di linear illi cuneato endes. Media lineeurvo toWard both encis in tho fame direction. Axia area
indistinci, lighil dilatei round tho mali centra nodule . Clos to the sedi an in thoro is on both siclos a longitudinal