212 BRITISH DESMIDIACEJE. 



forms figured by Klebs as constituting his "var. rotundatum" 

 The granulation he depicts does not seem to us to be very 

 exact, and we are quite at a loss to imagine what his fig. 60 

 represents. 



Var. granulusculum (Hoy & Biss.) West & Gr. S. 



West. (PI. LXXXV, fig. 4.) 



Cosmarium granulusculum Roy &: Biss. Scott. Desm. 1894, p. 102, t. 2, f. 8 j 

 Nordst. Index Desm. 1896, p. 135. 



Semicells with a somewhat narrower apex ; granules 

 of a uniform size and evenly distributed over the whole 

 surface, with no definite disposition. 



Length 35 /x ; breadth 31 ^ ; breadth of isthmus 8 ^ ; 

 thickness 19 p.. 



SCOTLAND. Howford near Inverurie, Aberdeen ; 

 G-illan near Banchory, Kincardine ; Folotry, Perth 

 (Ron $ Bissett]. 



We have not seen any specimens of this variety,, but it 

 appears to stand very near some of the tropical forms of 

 C. punctulatum, differing only in the rather narrower apices. 



189. Cosmarium anisochondrum Nordst. 

 (PL LXXXV, fig. 5.) 



Cosmarium anisochondrum Nordst. Alg. aq. dulc. et Char. Sandvic. 1878, 

 p. 12, t. 2, f . 7 ; Wille, Norges Ferskv. Alg. 1880, p. 27 ; ? Wolle, Desm. 

 U. S. 1884, p. 72, t, 16, f . 43-45 ; De Toni, Syll. Alg. 1889, p. 1029 ; Eoy 

 & Biss. Scott. Desm. 1894. p. 41 ; Nordst, Index Desm. 1896, p. 45 ; 

 West & G. S. West, Alga-fl. Yorks. 1900, p. 76. 



Ursinella anisochondra Kuntze, Revis. gen. plant. 1891, p. 924. 



Cells small, almost as long as broad, very deeply 

 constricted, sinus linear with a slightly dilated ex- 

 tremity ; semicells subsemicircular (trapeziform-semi- 

 circular), base flat, basal angles subrectangiilar, apex 

 widely truncate and very slightly convex, lateral 

 margins with 7 or 8 acute grannies, apex smooth, with 

 two irregular series of minute granules within each 

 lateral margin and with 4 or 5 granules just within 

 the apex, also with a granulated area in the centre of 

 the semicells (granules mostly large and rounded, dis- 



