Clare Island Survey — Fresh-water Algae. 16 29 



Chlorobotrys regularis (West) Bohlin. — C, very common with Utricvlaria 

 minor ; M, Cn, C, T>, CP, IT, I, CI, W, B, LG, DL, SL, Cr. This was 

 so variable in size and abundant in one place in Clare Island, 

 growing with Batrachospermv.ru ragum, that I measured a number of 

 examples; they varied from 11 '6 to 25'5 / u in diameter; it was on 

 account of the very large size of some of them that they were 

 measured. 



Class BACILLARIEAE (= Diatomaceak). 



(I have here adopted Van Heurck's arrangement of the Diatoms 

 for convenience.) 



Div. I. BAPHIDIEAE. 



Tribe Cymbelleae. 



Amphora ovalis Kiitz. — C, 52 x 33'5^ ; IT, L, D ; W, 50 X 30^, valve- view, 

 var. affinis Kiitz.— D, 26"6-36 x 14-1-18/i. 

 var. Pediculus (Kiitz.) V. H. (J. minutissima W. Sm.). — B, L. 

 f. minor V. H.— W, 31 x 17'6ju, 29 x 155^. 

 Cocconema affine (Kiitz.) W. & G. S. West.— M, D, L ; CP, average length 22^. 

 caespitosum (Kiitz.) G. S. West.— W, M, L, K. 

 var. lata V. H. — C, 



var. Auerswaldii (Eabenh.) Y. H.— C, W, CP. 

 Cistula Ehrenb.— C, IT, W, M. 

 cuspidatum (Kiitz.) G. 8. West— C, L, D ; W, 74 x 2i/i ; SL. 



var. naviculiformis (Auersw.) W. West. — L ; D, in several 

 places ; W, average size 33 x 7"3^. 

 cymbiforme Ehrenb.— W, M ; C, 56 x 10-3^ ; Croaghmore cliffs; K. 



var. parva (W. Sm.) W. West.— I,, W, CP. 

 *delicatulum (Kiitz.) W. & G. S. West. — C, SL; D, 30 x 5^, valve-view; 



LG, Cr; W, 36"5 x 4-8/u. 

 Ehrenbergii (Kiitz.) G. S. West. — C, large forms up to 125 x 30^, 



136 x 32-5,u, valve-view; L, I, W. 

 gastroides (Kiitz.) W. & G. S. West.— D ; C, 115 M long, also 98 x 22 M , 

 valve-view; M, from 104 up to 180^i long; W, 131 x 26 - 6^, in 

 another place 124 x 25ju ; Croaghmore cliffs, 

 var. minor (V. H.) W. West.— C. 

 gracile (Eabenh.) G. S. West.— W, CP, Ac. 



f. minor (V. H.) W. West.— M, L, SL, W, B. 

 helveticum (Kiitz.) W. & G. S. West.— C, 61 x 9^. 



