Clare Island Survey — Fresh-water Algae. 16 23 



Staurastrum oxyacanthum Arch. — C. 



paradoxum Meyen. — C, K, Ac, D, Cr, Cn. 



var. longipes Nordst. — DL, 20/t long, 44/* wide (with processes), 

 isthmus 67ju ; VL, D. 

 pelagicum W. & G. S. "West.— Plankton of LG, and of VL. 

 pilosum (Nag.) Arch.— AS, C, L, W ; D, 34x33,*. 



pileolatum Br£b.— S.W. of D, rare, 41-43 x 20-21/*, also 39 x 23/*, other 

 specimens from another gathering, 40/* long x 2-5-3^ broad across 

 apex, 18'3/j, across base, 12*5/* at isthmus. 

 polymorphum Breb. — C, L, W ; D. 234/* broad, 5-rayed. 



var. PUSILLUM var. nov. — Var. multe parvior, proeessubus 

 gracilioribus et subinflexis, forma corporis ut in forma 

 typica. C, 18-18 - 5/t long. 

 polytrichum Perty. — C, M : S.W. of D, not more than 47/* wide, spines 



6-7 /* long, 

 punctulatum Breb. — C; L, average dimensions 33-34/* long x 32/* wide; 

 IT, LG; W, 39 x 35/*; M, D, C, P. 



var. coronatum (Schmidle) W. & G. S. West. — D. 

 var. pygmaemn (Br£b.) W. & G. S. West.— C, 38 x 35/* ; 

 L, 36 x 29/*, breadth of isthmus 13-3/*, 31-6 x 30-8/*; W ; 

 D, 31-5 x 28 M ; M, 39 x 32-5/*. 

 pungens Breb. — C, rare, south side in small pond. 

 Reinschii Roy.— D, 21-6 x 22/* ; 0, 21 x 23/* ; W, SL. 

 scabrum Breb. — AS, M, CI ; C, 33-35/* broad, 36-37/* long, isthmus 



13 - 5/* broad. 

 Sebaldi Eeinsch. — L, SL, Cr. 



sexcostatum Breb. — C, 42/* long, 40/* wide with processes ; SL. 

 spongiosum Breb. — S.W. of D, rare, 

 striolatum (Nag.) Arch.— D, L, W, C. 

 teliferum Balfs.— C ; W, 36 x 3L5/*; LG. 



tetracerum Ralfs. — C, M, VL, DL, W ; Cr; LG, 21/* broad with processes ; 

 D,Cn. 



f. trigona W. & G. S. West.— D, W. 

 tumidum Breb. — W, M. 

 vestitum Balfs. — W. 

 Spondylosium pulchellum Arch.— C, in many places ; LG, CP; D, frequent, 



average size 17 x 13 - 6/*. 

 Sphaerozosma aubertianum West.— Ac. 

 excavatum Ralfs. — W. 

 secedens De Bary. — D, 9'6/* long, 11/* wide. 



