Clare Island Survey — Fresh-water Algae. 16 31 



*Navicula atomus Nag. — D. 

 Bacillum Ehrenb. — L. 



Brebissonii Kiitz.— C, IT, I, B, L ; "W, 52*5 x 11/t, valve-view; M, 

 LG, SL; D, 45 x 10'5, valve- view ; Cn, Croaghmore cliffs . 

 var. subproducta V.A. — S.W. of D, 34 x ll(i. 

 bicapitata Lagerstedt. — C, L, SL ; S.W. of D, 56 x 12/<, valve- view ; 



W, 61 x 12ji, valve- view. 

 cryptocephala Kiitz. — L, W, Cr ; C, up to 43 x 10 - 5/i ; D. 



var. exilis V.H. — C. 

 cuspidata Kiitz. — M, C, W. 



crucicula (W. Sm.) V.H. var. protracta Grun. — D, 20 x 6/<. 

 dicephala W. Sm.— C, M, W, L ; D, 29-5 x 95/*. 



elliptica Kiitz.— C, 31 x 14-3/t, valve-view; IT, L, I, AS, B; D, 24-25 x 

 14-2-15/u; W. 



var. ovalis Hilse. — CP ; W, 26 - 6 x 11/*, a rather narrow form ; 



D, 21-6 x ll-6/i. 

 var. oblongella Nag. — C, I, B, M, L ; W, large forms averaging 



29 x llfi. 

 var. minima V. H. — L ; W, up tor 18 x 9/t. 

 exilis (Kiitz.) Grun.— C, 23-3 x 6/t; M, IT, SL, L, B, CI, W, D, CP. 

 Gastrum (Ehrenb.) Donk. var. placentula (Ehrenb.) V. H. — C, D, L ; in 

 all three localities it occurred in fresh water, but near the sea ; in 

 the last locality it was among Spirogyra. 

 gibba (Ehrenb.) Kiitz.— C, 67 x 11/t up to 86 x 14/t ; M ; W, 50-5 x 8/i. 

 gibberula W. Sm. — W. 

 *gracillima Greg. — C, a variety with very faintly subundulate 



margins. 

 *gregaria Donk. — C, a large form up to 46 x 12(i. 

 gracilis Kiitz.— D ; C, 51 x 10 valve-view ; Croaghmore cliffs. 

 *hilseana Janisch. — CP, C. 

 Iridis Ehrenb.— C, IT. 



var. Amphirhyncus (Ehrenb.) De Toni. — C, D, L. 

 var. producta (W. Sm.) V. H.— D, W, C, SL. 

 lanceolata Kiitz. — C, L; D, 51 x 10/t. 



var. phyllepta (Kiitz.) V. H. — C ; W, small forms 23 x 6/i. 

 limosa Kiitz.— M, L, D ; C, 53 x 9/<, a narrow form ; W, 66 x 17'5/i, 

 54 x 14-3/i, 56 x 13-3/t. 



var. gibberula (Kiitz.) V. H.— IT, L. 

 Legumen Ehrenb.-SL, Cr; C, 76 x 15%; W, 75-5 x 14-6. 

 var. decrescens Grun. — 1), 70 x 13-4/1, a narrow form. 



