Conjugatfp, Desmidiaceae, Cosmarium. 083 



ricis in series leniter incurvas dispositis obsita; zygotis globosis, 

 spinis longis apiceque fissis armatis. 



Hab. in stagnis iu Britannia (Ralfs, Arciier, Cooke), Nor- 

 vegia (Nordstedt), Bohemia (Hansgirg), Lapponia rossica (Nord- 

 STEDT), America boreali (Wolle), ad « Montevideo, Uruguay » 

 Americae australis (Arechavaleta sec. Wille). — Var. compres- 

 sum Nordst. Freshw. Alg. of N. Zeal. and Austral. p. 46, t. 5, 

 f. 5, Botaniska Notiser 1887, p. 159 et in Notarisia 1888, p. 403: 

 semicellulis e fronte visis dorso interdura truncatis, granulis fere 

 in quincuncem ordinatis, series circ. 15 verticales et oblique tran- 

 sversas efficientibus, punctis inter granula nullis ; a latere visis 

 fere circularibus, a vertice visis anguste ellipticis vel oblongis, late- 

 ribus fere parallelis quasi ut in Cosmario pardali Cohn. Ad « Ar- 

 thur Pass, lacum Lyndon, Omatangi » in Nova Zelandia (S. Berg* 

 gren). Dimens. 54-64^54-56, lat. isthm. 18 a., crass. 27-28 p.. 



118. Cosmarium Brebissonii Meuegh. in Linna^a 1840, p. 219, n. 5, ^5^ 

 Ralfs Brit. Desmid. p. 100, t. XVI, f. 3, Desmaz. Cr. de Fr. ed. 



I, n. 903, ed. II, n. 203, Kuetz. Spec. Alg. p. 176. Br6b. Liste 

 p. 130, Rabenh. Alg. 1224, Fl. Eur. Algar. III, p. 158, Cooke 

 Brit. Desm. p. 100, t. 38, f. 2, Wolle Desm. U. S. p. 75, t. 13, 

 f. 10-11, Hansg. Prodr. p. 200, n. 409, Delponte Desra. subalp. t. 9, 

 f. 17-22. • — ■ Paullo longius quam latius, sinu angusto, extrorsura 

 subampliato; semicellulis semicircularibus, diametro pauUo longio- 

 ribus, angulis inferioribus obtusis approximatis, ventre raodice 

 concavis subplanis, dorso latissime rotundatis; raerabrana muricata, 

 muricibus conicis, acutis, secus series regulares collocatis; cellulis 

 e vertice visis ellipticis vel ovatis; dimens. cell. 110 ^ 80 (Cooke); 

 diam. 45-65 (Wolle) ; dimens. semicell. (?) 50 « 43 (Delponte). 



Hab. iu stagnis Italiae (Delponte, Meneghini), GalliEe (Bre- 

 BissoN, Lemaire, Desmazieres), Angliae (Ralfs, Cooke, Archer), 

 Germaniae (Rabenhorst), Danije (Jacobsen), Suecise (Cleve, Lun- 

 dell), Norvegiae (Nordstedt), Lapponiae rossicae (Nordstedt), 

 Bohemiae (Hansgirg, Schroeter), Belgii (De-Wildeman), Fennia) 

 (Elfving), Americee borealis (WoOD, Wolle), Sibiriae (Kozlowski). 



119. Cosmarium cyclicum Lund. Desm. Suec. p. 35, t. 3, f. 6 d, 2m 

 Cooke Brit. Desm. p. 116, t. 40, f. 11, Hansg. Prodr. p. 196, n. 

 393, Nordst. et Wittr. Desm. Ital. p. 37. — Mediocre, fere tara 

 longum quam latum, perfecte circulare, profunde constrictura, sinu 

 lineari, angustissirao, extrerao nonnunquam arapliato; semicellulis 

 seraicircularibus, ventre planis; aogulis subrectis vel oblique trun- 



