Clare Island Survey — Fresh-water Algae. 16 51 



Gyrosigma balticum (W. Sm.) O.K.— CB, 260 x 28/* ; ONE. 



var. ATLANTICTJM var. nov. — G. cellulis minoribus brevioribus- 



que constante sed formae ejusdem ut in forma typica. CB. 

 distortum (W. Sm.) O.K. — CB, 92 x 16-6ju. 

 formosum (W. Sm.) O.K.-CB, 425 x 31;u. 

 Hippocampus (Hass.) — CB. 

 *rigidum (W. Sm.) O.K.— CB. 

 strigilis (W. Sm.) O.K.— CB, 540 x 40//. 

 Orthotropis lepidoptera (Greg.) Cleve. — CNE, 108/* long. 



maxima Greg. — AS, 103 x 16 - 6/*, valve-view. 

 Plagiotropis elegans (W. Sm.) Grim. — C, up to 270/* long. 

 Schizonema Grevillei Ag. — C. 

 Navicula abrupta Greg. — M, 50 x 22/*. 

 *advena Ad. Schrn. — AS. 



var. parea Ad. Scam. — AS ; CNE, 37 x 12/ ( . 

 aspera Ehrenb. — CB, 66x14/*, a small form, also 105xl4 - 5/*; CNE, 

 100 x 19/*, 104-16/*, 104 x 21/*, also short forms 56 x 14/*, 96 x 22/*, 

 140 23-5/* ; AS, 63 x 21/* girdle-face ; K. 

 Bombus Ehrenb. — AS, 63 x 27 , 5/x, isthmus 17'5/*; CNE, 50 x 20/*, isthmus 

 12 - 5/* ; also 50-52 x 18/*, 55 x 24/*. 

 *balnearis Grun. var. MAJOR, var. nov. — Var. cellulis duplo longioribus et 

 latioribus quam forma typica, 70 x 22/*. CNE. 

 cancellata Oonk.-CB,68 x 16-5/*; CNE, 70 x 20-8/*. 

 cincta (Ehrenb.) Kiitz.— C, 37-39 x 7-5-8/* (in a somewhat brackish place). 

 Crabro Ehrenb. — C, 96 x 31 - 6/*, isthmus 22-5/*. 

 digitoradiata Greg. — C, 50 X 10/* ; L, mouth of Bunowen Paver, 69 x 12-5/*. 



var. Cyprinus (W. Sm.) V.H.— AS, 72 x 19/* ; CNE, 65 x 14-2/*. 

 didyma Ehrenb. — AS, 50 x 29/*; C, 29 x 12-5/*, common, a small form ; 



CNE, 34-39 x 15-16/*, 12-5-13/* at isthmus. 

 *forcipata Grav.— CB, 35 x 15/* ; AS, 37 x 18/x ; CNE, 31 x 12//. 

 formosa Greg. — CNE, 148/* long. 

 fusca Greg. var. hyperborea (Grun.) V.H. — AS, 70 x 32-5/t. 



var. delicatula Ad. Schm.— C, 47*23-5/*, a small form; CNE. 

 47 x 21ft. 

 granulata Breb.— CB, 58 x 30it, slightly retuse at sides, others 88 x 47/<, 



neither retuse nor almost flat at sides. 

 humerosa Breb.— AS, 50 x 25/*. 

 interrupta Kiitz. — CB, 53-65/x long, rather small forms; CNE, 57x19/1, 



12-5/i at isthmus, a narrower form 60 x 17/t, 12-2 at isthmus. 

 Liber W. Sm. — CNE, large forms up to 170 x 23/*, also 92 x 1S«. 

 G2 



