114 15KITISH DESMlDIACE^l. 



IRELAND.- -Ballynaliincli and Lough Derryclare, 

 Galway ! 



Forma glabra -nob. (PL LXVII, figs. 11-13.) 



Dyspliinctium globosum forma subviride Schmidle, Beitr. Algeiifl. Schwarz- 



wald. 11. Rheineb. 1893, p. 91, t. 6, f. 13. 

 Cosmarium moniliforme forma, subviride Schmidle, Chloroph.-Fl. Torfstiche 



Yirnlieim, 1894^ p. 51, t. 7, f. 7. 



Cell- wall smooth. 



Length 34-39 p.; breadth 18-22 /*; breadth of 

 isthmus 14-lG/i. 



SCOTLAND.- -Harris, Outer Hebrides ! 

 Geogr. Distribution. - 



The outward form of the semicells differs in no way from 

 that of typical C. -utricle, whereas its broad isthmus and 

 obovate semicells at once distinguish it from C. moniliforme. 



122. Cosmarium oblongum Bennett. 



(PI. LXXIV, fig. 20.) 



Cosmarium sp. Keinscli, Contrib. Alg\ et Fung-. 1867, p. 82, t. 12, f . 3. 

 Cosmarium oblongum Benn. Freshw. Alg-. Engl. Lake Distr. 1886, p. 10, 



t, 1, f . 16 ; Nordst. Index Desm. 1896, p. 185. 



Calocylindrus oblongus Cooke, Brit. Desm. 1887, p. 123, t. 44, f. 8. 

 Dysphinctium oblongum De Toni, Syll. Alg\ 1889, p. 891. 



Cells somewhat small, about 2-J times as long as 

 broad, moderately constricted, sinus very obtuse- 

 angled; semicells oblong- or ovate-elliptic. Cell-wall 

 smooth. Chloroplasts ? 



Zygospore unknown. 



Length 53 ^ ; breadth 22 ^ ; breadth of isthmus 15 p.. 



ENGLAND.- -Loughrigg, Westmoreland (Bennett). 



Geogr. Distribution.- -France. 



We have not seen this species. It should be compared 

 with C. moniliforme forma elongata. 



123. Cosmarium Hibernicum West. 



(PL LXXIV, fig. 21.) 



Cosmarium Hibernicum West, Alg. W. Ireland, 1892, p. 163, t. 21, f . 19 ; 

 Nordst, Index Desm. 1896, p. 139. 



Cells somewhat large, about twice as long as broad, 



