Clare Island Survey — Fresh-waier Algae. 16 35 



Epithemia zebra (Ehrenb.) Kiitz.— C, 49 x 10/i, valve-view ; I, D, L, Croagh- 

 more cliffs. 



var. proboscidea Grun. — C, 55 x 8'b/j. valve-view ; I), Croaghmore 

 cliffs. 

 Hyndmanni W. Sm.— C, 166 x 30^t; Croaghmore cliffs (a small form)- 



A very rare diatom. 

 Sorex Kiitz. — IT; LW, 40^ long, 12^ across, girdle-view. 

 Rhopalodia gibba (Kiitz.) Otto Mull— C, 128-143/x long x 128-13/u, girdle- 

 view; L, I, B, D; W, 118-140/i long; VL. 

 var. ventricosa (Kiitz.) Otto Miill. — C. 

 Eunotia Arcus Ehrenb. — M, "W. 



var. bidens V. H. — W, M ; C, 3L6 x 4ju, valve-view ; L ; D, 



32 x 5"2/x, valve-view, 

 var. minor V. H.— G, CI, M, B, SL, CP ; D, 26-27 x4 M ; 



Croaghmore cliffs, 

 var. uncinata V. H. — B, H. 

 var. hybrida Grun. — I. 

 var. tenella Grun. — C. 

 monodon Ehrenb. — CP. 

 diodon Ehrenb.— SL, C, PC. 

 *triodon Ehrenb.— M. 

 flexuosa Kiitz. var. bicapitata Grun. — W. 

 *exigua (Breb.) Eabenh.— C, D, CP, L. 

 var. nymanniana Grun. — W. 

 Faba (Ehrenb.) Grun.-D; W, 19-3 x 5V 

 gracilis (Ehrenb.) Rabenh. — G, M, L, I, SL; D, short forms 53 x 3 4^ 



also in another gathering 136 x 3/x ; W. 

 *impressa (Ehrenb.) var. angusta Grun. — D, 20-25 x 3-3'3yu. 

 lunaris (Ehrenb.) Grun. — C, L ; W, many were measured from 23 to 98^t 

 long from the same gathering, usually 3'2-4/i wide ; Ac, M, VL, AS- 

 I, CI, D, B, SL, CP, Cn. 



var. bilunaris (Ehrenb.) Grun. — L, D; W, 28-5 x 5-5,u. 

 var. excisa Grun.— Variable in length, 14-31 x 5-6^. 

 var. subarcuata (Nag.) Grun. — 1), L. 



var. EMARGINATOVALIDA nov. var.— Var. cellulis emarginatis 

 ad latus ventrale, crassioribus brevioribusque quam in 

 formas ceteras. D, among Hippuris vulgaris. This variety 

 has twice the breadth of Van Heurck's figure of E. lunaris 

 var. excisa Grun. (=Synedra falcata Breb.). His figure 

 measures 30x4*6^; the Irish specimens are 24 x 7-2ju. 

 (Plate II, fig. 21.) 



E2 



**i T 



