56 MESSES. W. WEST AND G. S. WEST ON 



Yar. srEANGULARE, nov. var. (PL VIII. fig. 3.) Var. major, octava parte longior qiiam 

 lata, angulis inferioribus minus rotundatis, prope angulos inferiores levissime 

 retusis, apicibus subtruncatis, istbmo latiore. 

 Long. 92 ^ ; lat. 81 ^ ; lat. istlim. 51 /i. 

 No. 0. 



61 . CosMARiUM PSEUDOPYRAMIDATUM, Lund. Desm. Suec. p. 41, tab. ii. fig. 18. 

 Long. 54 m; lat. 31 fi; lat. isthm. 13"5 /*. 



No. 0. 



62. CosMAEiUM ELLiPSOiDEUM, Elfv. Antockningar om Finska Desmidieer, p. 13, tab. i, 



fig. 10. 



Eorma minor, Anders. Bidrag till kannedom Sverig. Chlor. p. 16, fig. 9; non Racib. 

 Nonn. Desmid. Polon. p. 28, tab. x. fig. 9, 

 Long. 23 ^ ; lat. 19 ^ ; lat. isthm. 6 ^ ; crass. 11 fx. (PL IX. fig. 25.) 

 No. 1. 



63. CosMARiTJM BiREME, Nordst. Desm. Brasil. tab. iii. fig. 33. 



Var. ROTTJNDATUM, nov. var. (PL VI. fig. 37.) Var. paullo longior, lateribus rotundatis, 

 papilla centrali angustiore. 



Long, 15-15-5 fx; lat. 12-5 ^u; lat. isthm. 3'5 n; crass, cum papilL 11 5-125 fx. 



No. 0. 



One example of this variety was seen which had a second papilla on one side of the 

 apex of one semicell. 



Var. CRASSUM, nov. var. (PL VI. fig. 36.) Var. paullo major, papilla centrali multo 

 crassiori, membrana punctata. 

 Long. 18 ju; lat. 16 ju ; lat. isthm. 4*5 ^; crass. 15 /x. 

 No. 0. 



64. CosMARiiJM TiTHOPHORUM, Nordst. De Alg. et Char. i. p. 6, tab. xvi. fig. 6. Forma 

 apicibus leviter depressis. 



Long. 19 fx ; lat. 20 /u ; lat. isthm. 8 fi ; crass. 145 fx. (PL IX. fig. 26.) 

 No. 1. 



65. CosMARiUM PSEUDOPROTTJBERANS, Kirchn. Alg. Schles. p. 150; Nordst. Desmid. 



Nordensk. expedit. till Gronland, tafl. vii. fig. 3. 



Var. ANGUsTius, Nordst. Freshw\ Algae of New Zeal. & Austr. p. 58, tab. vi. figs. 15, 16. 

 Forma paullo minor. (PL IX. fig. 22.) 

 Long. 23-25 ^i ; lat. 16-17 ^ ; lat. isthm. 5 ^ ; crass. 11-5 ^. 

 Nos. 3 and 22. 



