16 24 Proceedings of the Royal Irish Academy. 



Desmidium Swartzii Ag.— C, 41-43^ broad, 20'5-21 M long; W; Cr, 383/* 

 broad, 14'5 long. 

 cylindricum Grev. — C, M; D, average of many specimens 12^ long, 49^ 

 wide. 

 Gymnozyga moniliformis Ehrenb. — C, W ; SL, 24 x 20'8/v., another gathering 



36-40 x 20-23-3/*; D, 25-31 x 16-5-20-2L*. 

 Hyalotheca dissiliens (Sm.) Br6b. — C, AS, I, VL, W, B, Cr ; D, diameter of 

 zyospores 26/x; C, cells 16'3,u, long, 29/* broad, 65/t with hyaline 

 sheath ; CP ; M, 26-28/* broad. 



f. punctata Jacobsen. — C ; CP, 24-25 - 2 broad. 

 undulata Nordst. — L. Creggan, C. 



Order PROTOCOCCOIDEAE. 

 Fam. Chaetopeltideae. 

 Chaetosphaeridium globosum (Nordst.) Klebahn. — C, cells 13'3-15/t broad ; 

 I, cells 9-1 0/* broad; W. 



var. depressum W. & G. S. West. — C, 10-12^t broad. 

 Fam. Volvocaceae. 

 Sub-fain. Volvoceae. 

 Volvox aureus Ehrenb. — C, frequent, average diameter of cells 350/x. 

 Eudorina elegans Ehrenb. — C, SL, I, CI ; D, a number of examples were 

 measured from here, the colonies reached up to 220/*, and as the 

 cells began dividing to form new colonies they varied from 26 to 32/* 

 in diameter as incipient colonies. 

 Gonium pectorale Muller. — C, W. 



Pandorina morum (Muller) Bory.— C, SL, LG, I, CI, W, D ; Cr, cells 8-10/* 

 broad, coenobia 30-45/* broad; M, cells 10-12/* broad. 

 Sub-fam. Chlamydomonadeae. 

 *Carteria multifUis (Fresen.) Dill. — L, up to 16/* broad. 

 Chlamydomonas Pulvisculus (Mull.) Ehrenb. — C, W. 



*Kleinii Schmidle. — D. 

 Sphaerella lacustris (Girod.) Wittr. — C, L, W. 



Fam. Endosphaeraceae. 

 *?hyllobium sphagnicola G. S. West. — D, on Sphagnum cuspiclatum. 

 *Chlorochytrium Knyanum Szymanski. — C. 



Fam. Characieae. 

 Characium debaryanum (Peinsch.) De Toni.— Ac, K. 



♦Pringsheimii A. Br. — L ; C, epiphytic on Oedogonium. 

 subulatum A. Br. — VL. 



