108 BKITTSH DESMIDIACE^:. 



Forma latior. (PI. LXXIV, fig. 1.) 



C. Cucurbita forma major et latior, West, Alg. Engl. Lake Distr. 1892, 

 p. 729. 



Length 42 ^ ; breadth 27 /x. 



ENGLAND.- -Kirk Fell, Cumberland! Loughrigg, 

 Grisedale Tarn, and Brandreth, Westmoreland ! 



Var. attenuatum Gr. S. West, (PI. LXXIII, figs. 



34-30.) 



Dyspliinctium Cucurbita (Breb.) Haiisg. forma ad apices versus attenuata 

 ibiqvie late rottiiidato-trmicata, Schmidle, Beitr. alp. Alg. 1895, p. 347, 

 t. 14, f. 16. 



Cosmarium Cucurbita Breb. var. attenuatum G. S. West, W. Indian 

 Freshw. Alg. 1904, p. 286, t. 464, f . 18. 



Semicells distinctly attenuated towards the apices, 

 which are rounded -truncate. 



Length 24-46 p.; breadth 15-2-22 p, ; breadth of 

 apex about 10-12 //, ; breadth of isthmus 14-20 p.. 



ENGLAND. Mickle Fell, X. Yorks ! New Forest, 

 Hants ! 



Geogr. Distribution. --Germany. W. Indies. 



This variety is usually somewhat smaller than typical 

 C. Cucurbita. The attenuation of the semicells is sometimes 

 very marked, hut many intermediate states exist. 



117. Cosmarium Palangula Breb. 

 (PI. LXXIV, figs. 4, 5.) 



Penium Palangula Breb. in Diet, universelle d'hist. natur. Paris, vol. iv, 



1844, p. 513. 

 Cosmarium Palangula Breb. in Ealfs' Brit. Desm. 1848, p. 212 ; Breb. 



Liste Desm. 1856, p. 132, t. 1, f . 21 ; Arch, in Pritcli. Infus. 1861, p. 735 ; 



De Not. Desm. Ital. 1867, p. 41, t. 3, f . 24 ; Eabenh. Flor. Em-op. Alg. 



Ill, 1868, p. 174; Aiiderss. Sverig. Chlor. 1890, p. 15; West, Alg. W. 



Ireland, 1892, p. 162 ; Liitkem. Desm. Attersees, 1893, p. 549 ; Eoy & 



Biss. Scott. Desm. 1894, p. 170 ; Nordst. Index Desm. 1896, p. 193 ; 



Liitkem. Desm. Millstiittersees, 1900, p. 10 ; West & G. S. West, Alga-fl. 



Yorks. 1900, p. 94 ; Borge, Alg. erst. Eegiiell. Expecl., II. Desmid. 1903, 



p. 93 ; Beitrage Alg. Schwedeii, 1906, p. 35. 

 C. Palangula Breb. a. genuinum Eabenh. Flor. Europ. Alg. IH 3 1868, 



p. 175. 

 Calocylindrus Palangula (Breb.) Kirchn. Alg. Scliles. 1878, p. 143 ; Cooke, 



Brit. Desm. 1887, p. 125, t. 44, f. 9; West, Alg. N. Wales, 1890, p. 291. 

 Dyspliinctium Palangula (Breb.) Hansg. in Osterr. Bot. Zeitschr. xxxvii, 



1887, p. 99; Prodr. Algenfl. Bohm. 1888, p. 184; De Toni, Syll. Alg. 



1889, p. 879 ; Schmidle, Lappmark Siisswasseralgen, 1898, p. 19. 



Cells small, subcylindrical, about 2-J 3. times as long 



