Conjugatse, DesmidiacecT, Cosmariura. 999 



rainoribus densioribusque, semicellulis a vertice conspectis late 

 ellipticis, centro verrucis ad puncta reductis, a latere visis circu- 

 laribus. Ad a Lagoa Santa » in Brasilia America3 australis (War- 

 ming). Dimens. 66-77^51-58; crassit. 38-43 a. 



150. Cosmarium latum Breb. Liste p. 128, n. 21, t. I, f. 10, Archer 2387 

 in Pritch. Inf. p. 733, Rabenh. Fl. Eur. Algar. III, p. 158, Wolle 

 Desm. U. S. p. 76, t. 13, f. 14, Cooke Brit. Desm. p. 101, t. 41, 



f. 8, — Magnum, paullo longius quam latius, 80-95 ^ 60-80, pro- 

 funde constrictum, sinu angusto, basi obtuso ; semicellulis late re- 

 niformibus, dorso lateribusque late rotundatis, margine crenula- 

 tis; raembrana granulata, granulis Iq series concentrice leniter 

 curvatas dispositis. 



Hab. in staguis prope « Mezidon » (De-Brebisson) et Parisios 

 in Gallia (Petit), in Vogesis (Lemaire), Anglia (Bennett, Cooke), 

 Suecia (Lundell), Norvegia (Xordstedt), America boreali (Wol- 

 le). Pyrenoides, ut videtur, bini. — Var. margaritatum Lund. 

 Desm. Suec. p. 26, Cosmarium lalum Wittr. Anteckn. p. 12 non 

 Breb. : typo paullo minus ; semicellulis dorso (medio recto) altius 

 convexis, a vertice conspectis oblongo-ellipticis; verrucis densissi- 

 mis multo quam in typo majoribus, in series distinctas regulares 

 et verticales et oblique transversas ordinatis; raembrana inter ver- 

 rucas pellucido-punctata. Ad « Unnarjd, Femsjo, Rappe, Wire- 

 storp » in Smolandia Sueciae. — Dimens. 80 « 68, lat. isthrai 20 ^. 



151. Cosmarium suborbiculare Wood in Proceed. Acad. Nat. Sc. 1870 2388 

 et Freshw. Alg. U. S. p. 129, t. 21, f. 9, WoIIe Desm. U. S. p. 



78, t. 24, f. 24. — Parvum, suborbiculare, longius quam latius, 

 33 ^^ 30, cum margine enormiter crenato vel crenato-undulato ; se- 

 micellulis a latere orbicularibus, a vertice ellipticis; sinu extror- 

 sum angustissirao sed introrsum nonnihil excavato; raerabrana 

 crassa, sparse verruculosa; granulis in semicellulis singulis subdi- 

 stantibus et secus series elongatas duas (interdum unam) exter- 

 nas curvatas et secus series duas internas breves rectasque di- 

 spositis. 



Hah. in lacu « Saco » N. Harapshire Americae borealis (Lewis). 2389 



152. Cosmarium decachondrum Roy et Bisset On Japanese Desraids 

 p. 196, tab. 269, f. 15, Notarisia 1886, p. 187. — Tenue, subun- 

 dulatura, aeque longura ac latura, subcirculare, 30 >» 30, isthrao 9 

 ^. lato; semicellulis apicibus truncatis, 5-6 spinulas gerentibus; 

 semicell. basi recta, sinu leniter extrorsura ampliato, papilla quo- 

 que angulo limitato, lateribus fere indistincte 4-unduIatis; serai- 



