Cosmarium] xi. desmidiacEjE (West). 355 



Soc. 2nd ser. v. 61, t. vii. f. 21), but it is easily distinguished by its 

 shorter cells, its smaller size, its round (not triangular) scrobiculations 

 surrounding the granules, as well as its wider apex. 



This is the only species we know which has the two opposite sides 

 of the hexagons of scrobiculations surrounding each granule, horizon- 

 tally disposed. 



41. C. margaritatum Roy & Biss. in Journ. Bot. xxiv. 194 

 (1886); Roy in Ann. Scott. Nat. Hist. 167, t. ii. f. 12 (1894). 



C. latum Breb. var. margaritatum Lund, in Nova Acta R. Soc. 

 Scient. Tips. ser. 3, viii. 26 (1871). 



Foj-ma minor Boldt. in Bib. till Sv. Vet.-Akad. Handl. Bd. 13, 

 Afd. 3, no. 5, 26 (1888) ; W. et G. S. West in Journ. Bot. 1897, 

 p. 121. 



LiBONGO. — Ad margines flum. Lifune ; Sept. 1858. No. 204. 



42. C. Portianum Arch, in Q. J. M. S. viii. 235-6, t. xi. f. 8, 9 

 (1860) ; in Pritch. Infus. 733 (1861) ; Rabenh. Fi. Europ. Alg. 

 iii. 160 (1868). 



Var. orthostichum Scbmidle in Bericht. Deutsch. Bot. Ges. Bd. 

 xi. Heft. 10, 549, t. xxviii. f. 7 (1893). Forma minor W. et G. 

 S. West in Journ. Bot. 1897, p. 121, t. 368, f. 9. 



LiBOXuo. — Ad margines flum. Lifune ; Sept. 1858. No. 204. 



This approaches C. nephroideum Roy & Biss. (in Ann. Scott. Nat. 

 Hist. 1894, 169, t. ii. f . 3), which seems to differ from C. Portianum 

 var. nephroideum Wittr. both in its smaller size and in the regular 

 arrangement of its granules. 



43. C. trachycyrtum Reinsch, Contrib. Alg. etFung. 83, t. xviii. 

 f. 1 (1875); W. et G. S. West in Journ. Bot. 1897, p. 121. 



HuiLLA. — Inter Porphyrosiphonem Notarisii Kiltz. in udis sylvaticis 

 et apricis inter Mouino et lac. Ivantala ; April 1860. No. 14. 



44. C. punctulatum Breb. in Mem. Soc. Sciences Nat. Cher- 

 bourg, iv. 129, 303, t. i. f. ] 6 (1856) ; Klebs in Schrift. pbys.-okon. 

 Gesellsch. Konigsberg, xx. 37, t. iii. f. 50, 51 (1879) ; W. et G. S. 

 West I.e. 



HuiLLA, — In rivulis prope LopoUo ; May 1860. No. 187- 



Var. elongatum Klebs, I.e., t. iii. f. 53 ; W. et G. S. West in 



Journ. Bot. 1897, p. 122. 

 HuiLLA. — In uliginosia editioribus prope Humpata, Empalanca et 



Lopollo ; May 1860. No. 15. 



45. C. eoneentricum W. B. Turn, in K. Sv. Vet.-Akad. Handl. 

 Bd. 25, no. 5, 62, t. ix. f. 11 (1893). 



Var. radiatum W. et G. S. West in Journ. Bot. 1897, p. 122, 

 t. 368, f. 10. 



HuiLLA. — In nliginosis editioribus prope Humpata, Empalanca et 

 Lopollo ; May 1860. No. 15. 



46. C. Blyttii Wille in Vid.-Selsk. Forhandl. Ohristiania, no. 11, 

 25, t. i. f. 7 (1880) ; W. et G. S. West in Journ. Bot. 1897, 

 p. 122. 



LiBONGO.-^Ad margines flum. Lifune ; Sept. 1858. No. 204. 



