Nyt magazin for naturvidenskaberne

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min ed.

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Not uncommon. here a re curious ab normal divisionii a specimen In Stead O de vel oping wo ne semicelis, he

Rare.

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have observet a single specimen Oi a desin id. hichiarea stri in resemblance o P. Subtile. I domos, hoWever, venture

68. Closterium Archerianum Cleve. Spoci mens of his destia id ei e by O mean Uncommon. The moest ornas e re intermediate et ween the lype an Cl. porrectum Var angustulum It is ver probabi that Cl. Archeria. num liould not se separa ted irona Cl. porrectum, ut e placedas Closterium porrectum var Archerianum Cleve nob. Cl. porrec

nolice it Irona a single ample Sige long 280 ιι, lat. 28 ,

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nounce laterat obes, only three protuberances visibi acrOAAthe celi protuberances caused by an uisitis hichen in o thecell-wall. The largo uastra re ver variable nil hereior I cannot regard his orna ct a separate variety. The charreclerS, whiel, I have potia ted ut ars no sufficient to describe thodes mi as a distinc varie ty. The ulli ne is ver variabie, undin hos largo Euastra it is no good character. At the protuberRnce Were ver much reduced uni could orat he observetiwilli extronae obliquo illumination. In th vertica vie thereare truces of h other tw protuberances a in the figure. Last the thirii charactor cui noti regat dod a good, as it is probab lethat ille cellis otton do volops the proluberances by an utSi de