Clare Island Survey — Fresh-water Algae. 16 33 



Navicula stauroptera Gran. — L; Cr, 92 x 15/*, valve-view. 



Tabellaria Ehrenb. — W, 113 x 15/*, another gathering 112 x 15-5/*, 

 103 x 13-3/* ; 0, 114 x 16/* ; M, 120 x 19/*, also small narrow forms, 



83 x 10/*; S, 108 x 12/*; L. 



var. acrosphenia Eabenh. — W. 

 *vulpina Kiitz.— W, 84-90 x 12-5-14-3/*; M, 88 x 14-3/*. 

 viridula Kiitz.— C, L, SL,Cr; W, 72-6 x 16-5-17/*; M, 70 x 16'5/e. 

 f. minor V. H. — W, 44 x 10/z; G, 50 x 10/*, valve-view, 

 var. slesvicensis (Grun.) V. H. — D, 41x11/1, 51x13/*'; W, 



54 x 12-5/t. 

 var. avenacea (Breb.) V. H. — L, 46 x 8'5u, valve-view, 

 viridis Kiitz.— O, M, IT, I, L, CI, B ; W, 91 x 15 3, girdle-view ; SL, CP: 

 D, 102 x 22/*, valve-view ; Cn ; Croaghmore cliffs, 

 var. commutata Grun. — C. 



var. ANGUSTATUM \ r ar. nov. — Var. cellula angusta, diametro 

 7-plo longiori, apicibus non attenuatis. D, 87 x 12-5/*. 

 Vanheurckia rhomboides (Ehrenb.) Breb. — W ; M, up to 94 x 20/* ; L, D ; C, 



84 x 16/i. 



var. saxoniea (Rabenh.) W. & G. S. "West. — G, 51-63 x 

 133-15-4/t; L, As, M, CP, SL, IT, DL, S, I, W, B, 

 CI, D, Cn. 

 viridula Kiitz.— C, L, SL, Cr, W; CP, 108 x 21/*, also from another 



place 73 x 13/*. 

 vulgaris (Theo.) V. H. — C. 

 Amphipleura pellucida Kiitz. — L, W, SL. 

 *Gyrosigma acuminatum (Kiitz.) O.K. — L, 126x14/*, smaller forms 101 X 

 13-5/x; W, 122x13-5**. 

 attenuatum (Kiitz.) Eabenh.-L; W, 227-235 x 27-5-29/*; VL. 



var. scalprum (Grun.) O.K. — C; "W, 127 x 21'3/*. 

 Spencerii (Quekett) O.K.— W, C. 



var. nodifera (Grun.) O.K. — Croaghmore cliffs. 

 **curvulum (Ehrenb.) Eabenh. f. longior (V.H.)— C, 155 x 145/t. 



Tribe Gomphonemeae. 



Gomphonema acuminatum Ehrenb.— C, W, IT, L, I, CI, D ; Cn, 64-69 x 

 * 11-5-14/*, valve-view. 



constrictum Ehrenb.— L, 37 5 x 11-5/*, valve-view ; "W, D, YL ; CP, 34-42/1 

 long, 15-18/* broad, breadth of stalk 4/*. 



var. capitatum (Ehrenb.) V.H. — L, D, CP. 



JS.I.A. PKOC, VOL. XXXI. E 16 



