COSMAKIUVi. 47 



Yar. sphaeruliferum West. (PL LXIX, fig. 13.) 



C. tatricum var. splixruliferum West, Alg. W. Ireland, 1892 p 14 -;> 

 t. 20, f. 19. 



A larger variety with about seven small scrobicula- 

 tions within the margin of each semicell and three 

 near the isthmus; cells in side view distinctly con- 

 stricted in the middle. 



Length 45 //, ; breadth 25 JJL ; breadth of apex 18*5 p, ; 

 breadth of isthmus 15 p. ; thickness 14 -u. 



IRELAND. Lough Shannacloontippen, Galway ! 



In the constricted lateral view of the cell var. splixruliferum 

 agrees with the preceding variety, but the small scrobicula- 

 tions are distinctive and the basal angles are rounded. 



75. Cosmarium anceps Lund. 

 (PI. LXIX, figs. 14-17.) 



Cosmarium anceps Lund. Desm. Snec. 1871, p. 48, t. 3, f . 4 ; Xordst. 



Desm. Spetsb. 1872, p. 36; Wille, Ferskv. Alg. Xov. Semlj. 1879, 



p. 39 ; Cooke, Brit, Desm. 1886, p. 82, t. 36, f. 8 ; West, Alg. X. Yorks. 



1889, p. 292 ; Alg. X. Wales, 1890, p. 288 ; Alg. W. Ireland, 1892, p. 143; 



Alg-. Engl. Lake Distr. 1892, p. 724 ; Liitkem. Desm. Attersees, 1893, 



p. 549 ; Koy & Biss. Scott. Desm. 1894, p. 41 ; Xordst. Index Desni. 



1896, p. 44; G. S.West, Alga-fl. Cambr. 1899, p. 114; West & G. S. 



West, Alga-fl. Torks. 1900, p. 90 ; Alg. X. Ireland, 1902, p. 32 ; Freshw. 



Alg. Orkneys and Shetlancls, 1905, p. 22. 

 Dysphinctium anceps (Lund) Hansy-. Prodr. Algenfl. Bolim. 1888, pp. 187, 



278; DeToni, Syll. Alg. 1889, p. 893. 

 D. anceps forma glabra Gutw. Xonn. Alg. Xov. 1896, p. 43, t. 7, f. 35 c, d. 



Cells small, almost twice as long as broad, longi- 

 tudinally oblong-hexagonal, only moderately con- 

 stricted, sinus slightly open and not deep ; semicells 

 truncate-pyramidate, sides very slightly concave 

 (almost straight), apex truncate and slightly retuse- 

 emarginate, upper and lower angles rounded. Side 

 view of semicell ovate. Vertical view very broadly 

 elliptic with slightly produced (submammillate) poles, 

 ratio of axes about 1 : 1'3. Cell-wall smooth. Chloro- 

 plast axile with one central pyrenoid. 



Zy go spore unknown. 



Length 25-35 /u,; breadth 14'5-19/u; breadth of 



