Conjugatae, Desmidiaceas, Cosmariutri. 1005 



a latere visis rhoinboideis, angulis rotundatis, lateribu.s superioribus 

 leviter retusis; a vertico conspectis rhomboideo-ellipticis, niedio 

 utrinque tumore rotundato prseditis, ad apices rotundatos tuniori- 

 bus parvis 2 ornatis; membrana achroa, glabra; pyrenoidibus siu- 

 gulis. 



Hab. in« Tinecia» pr, Cracoviam Poloaiae (Raciborski). 



163. Cosmarium Oliveri Schaarschm. Afghan. Alg. p. 240, n. 35, t. 5, 2400 

 f. 22- — Parvuni, tertia parte longius quara latius, 48^31, elli- 

 pticuni, medio profuude constrictum, sinu lineari angustissimo; se- 

 niicellulis a basi recta magis magisque angustatis, apice valde ro- 

 tundatis, lateribus leviter convexis, angulis inferioribus subrectis; 



a vertice visis oblongo-ellipticis, medio inflatis, breviter cuspida- 

 tis; pyrenoidibus singulis; merabrana achroa, glabra. 



Hab. in Afghanistania Asise (Aitchison). — Diflfert a Cosma- 

 rio micro^^phinGto Nordst. praicipue seraicellulis e vertico visis 

 oblongo-ellipticis, niedio breviter cuspidatis. 



164. Cosmarium Holmii Wiile in Wille et Rosenv. Alger fra Nova- 2401 

 ja-Semlja og Kara-Havet p. 84, t. XIII, f. 2. — Magnura, 44 r^.. 

 crassum. fere aeque latum ac longum, 70-76 =; 66-74, sinu amplissi- 

 mo, isthrao 26-28 y.. lato ; seraicellulis elliptico-hexagoniis vel fere 

 ellipticis, a latere visis fere pentagono-orbicularibus, a vertice vi- 



sis ellipticis, raedio utrinque turaore prseditis ; pyrenoidibus singu- 

 lis; raerabrana subtiliter granulata. 



Hab. 3id Ophrydium versatile in Novaia Semlia (T. Holm). 



165. Cosmarium atlantoideum Delp. Specim. Desm. subalp. p. 101, 2402 

 t. VII, f. 22-24. — Cellulis subtetragoniis, tara longis quam latis, 

 21,5 s 21,5, profunde constrictis; semicellulis e fronte reniforrai- 

 triangulatis, fere duplo raagis longis quam latis, angulis rotunda- 



tis, vertice depressis; e latere visis eximie sphsericis, e vertice ob- 

 longo-ellipticis, raedio turaidis; isthrao fere tertiara latitudinis to- 

 tius partem aequante ; pyrenoidibus singulis; raerabrana levi. 

 Hab. in lacu candiano Italise borealis (J. B. Delponte). 



166. Cosmarium microsphinctum Nordst. in Nordst. et Wittr. Desm. 0403 

 Ital. Tyrol. p. 33, t. XII, f. 9, Cosmarium pseudo-pyramidalum 

 forma Nordst. Desra. Arct, p. 19. — Subparvum, 20 fx. crassum, 

 ellipticum, circiter diraidio longius quara latius, 35 s; 25-26, medio 

 modice constrictum, sinu lineari angusto, isthmo 15-16 u.. lato; se- 

 raicellulis semiellipticis, e basi recta magis raagisque angustatis, 

 apice obtuso-rotundatis, non truncatis, lateribus levitor convexis, 

 angulis inferioribus rectis; a vertice visis late ellipticis, apicibus 



