Clare Island Survey — Fresh-water Algae. 16 9 



Spirotaenia minuta Thur. — SW of D, 24 x 6 - 5/«. 

 obscura Kalfs. — D, 55 x 16-4//. 

 bispiralis West.— W. 



condensata Breb.— 0, 165 x 25/ t ; D, 212 x 20/ ( , a long narrow form, 

 smaller forms down to 122 x 19/* with six turns of the spiral. 

 Mesotaenium chlaniydosporum De Bary.— W; D, 29-7 x 11// : in another place 

 23 x -11,1,24 x 11-5/1,25 x 12//. 



f. minor, W. & G. S. West.— W; D, 20 x 9//. 

 De Greyi Turn.— L, 67-103 x 23-24//; D ; C, a short form intermediate 

 between type and var. breve, 70 x 21//. 



var. tenuis W. & G. S. West. — D, an elongated form, 1 05 x 1 5//. 

 endlicherianum Nag. — S, 25 x 7'5/e ; C, 29"7 x 9-2//, another gathering 

 25-3 x 7-7// ; D, 25 x 8-3// ; Cr, 33 x 10//. 

 var. grande Nordst.— M, 53-54 x 13-3//. 

 macrococcum (Kiitz.) Roy. & Biss. — L, 37 x 1 5// ; C, 37 - 15 x 5-4// ; VL; CP, 

 35-35-5 x 14-14-5//. 



var. micrococcum (Kiitz.) W. & G. S. West. — S, 19 x 8 - 3/z; C. 

 Cylindrocystis Brebissonii Menegh.— C, AS, S ; SL, 58 x 18//; CP, L, B, W, M; 

 D, up to 61 x 18-5//. 



var. minor W. & G. S. West.— M; D, 25 x ll-6/t, short forms, 

 in another locality 41 x 125//, some thick forms 29 x 14//. 

 crassa De Bary.— IT, SL, L, C, CP ; D, 47 x 23-4/,, in one place thick 



specimens 475-48 - 3 x 25 (-28)//, also narrower forms 365 x 19-2/1. 

 diplospora Lund. — C, 68 x 29//, also from another place small forms 

 50 x 21//; SL, CI; CP, average size of some 65 x 28 - 7/z, others 

 64 x 24u ; D, 59 x 24,u, also 66 x 26//. 

 Netrium Digitus (Ehrenb.) Itzig. & Eothe— C, up to 360 x 98// ; D, M ; IT, up 

 to 90// lat. ; LG, I, SL, B, W, CP. 

 interruptum i^Breb.) Lutkem. — W, C. 



var. sectum W. & G. S. West.— W. 

 Naegelii (Breb.) W. & G. S. West.- I;, 

 oblongum (De Bary) Lutk. — C. 



var. ANGTJSTATUM var. nov. — Var. cellulis distincte angustiori- 



bus quam in forma typica, 1 23 x 23/<. C, in sphagnum pool. 



var. BREVIUS, var. nov. — A r ar. cellulis diametro 3|-plo longiori- 



bns. C, 86 x 25//, also 86 x 25// in another locality, 

 var. cylindricum W. & G. S. West.— D, 89-108 x 22-5 23//, a 

 large form ; near L. Keel, Achill, 63-70 x 18-3//; C, 79 x lS/i. 

 Penium cruciferum (De Bary) Wittr. — M, 15x8-4//: in a different gathering 

 in the same district up to 27 x 12-5// ; W, 17 x 9'8//. 



R.I.A. PROC, VOL. XXXI. B 16 



