250 BRITISH DESM1DIACE.E. 



Attersees, 1893, p. 554 ; Eoy & Biss. Scott, Desm. 1894, p. 174 ; Borg. 

 Ferskv. Alg. Ostgronl. 1894, p. 15 ; Borge, Siisswasseralgeii Franz 

 Josefs-land, 1899, p. 761 ; West & G-. S. West, Alga-fl. Yorks. 1900, 

 p. 85 ; Borg. Freshw. Alg. Faeroes, 1901, p. 226 ; Larsen, Freshw. Alg. 

 E. Greenland, 1904, p. 88. 



Cells often larger than the type, crenations bigranu- 

 late (except for 2 or 3 or the smaller ones near the 

 basal angles), with about 3 concentric series of binate 

 granules within the margin (also radially arranged), 

 the rest single ; with 9-13 vertical series of granules 

 forming the granulated band across the base of the 

 semicells. Vertical view with a slight but broad 

 swelling at each side. 



Length 61-81^; breadth 43-58 /^ ; breadth of 

 isthmus 25-32*5 ^ ; thickness 28-35 /x. 



ENGLAND.- -Kirk Fell, Westmoreland ! Arncliffe and 

 Penyghent, W. Yorks ! 



SCOTLAND. Near Scallowav, Shetlands ! 



v 



IRELAND. Achill Island, Mayo ! 



V 



Geogr. Distribution. Austria. Norway. Nova 

 Zembla. Spitzbergen. Franz Joseph Land. Green- 

 land. Faeroes. 



Var. simplex Nordst. (PL LXXXIX, fig. 6.) 



C. speciosum Lund. 3 simplex Nordst. Desm. Spetsb. 1872, p. 31, t. 6, f. 12 ; 

 Desm. Arctose, 1875, p. 22 ; Desm. Ital. 1876, p. 37 ; Alg. aq. dulc. et 

 Char. Sandvic. 1878, p. 12 ; Wille, Ferskv. Alg. Nov. Semlj. 1879, p. 41 ; 

 Boldt, Desm. Gronland, 1888, p. 20 ; Mask. Further Notes N. Zeal. 

 Desm. 1889, p. 16, t. 2, f. 23 ; West, Alg. W. Ireland, 1892, p. 159 ; Eoy 

 & Biss. Scott. Desm. 1894, p. 175 ; Borg. Ferskv. Alg. Ostgronl. 1894, 

 p. 15 ; West & G. S. West, Alga-fl. Yorks. 1900, p. 85 ; Larsen, Freshw. 

 Alg. E. Greenland, 1904, p. 89. 



Semicells more attenuated towards the apex than in 

 the type, crenations entire and all the granules simple, 

 basal vertical series of granules commonly very indis- 

 tinct or absent. 



Length 42-60 ^ ; breadth 30-40 ^ ; breadth of isth- 

 mus 14-20 jji ; thickness 21-26 p.. 



ENGLAND.- -Penyghent, W. Yorks ! Mickle Fell and 

 Cowgill Wold Moss on Widdale Fell, N. Yorks ! 



SCOTLAND.- -Ross, Inverness, Banff, Aberdeen, Kin- 



