THE FRESHWATER ALG.E OF CEYLON. 127 
arranged as in (dogonium punctatostriatum, De Bary, Œ. minus, Wittr. &c. The 
oogonia are proportionately very long, and apparently possess a terminal pore. 
Genus ŒDOGONIUM, Link. 
10. GipoGoniuM cryProporuM, Wittr. Dispos. CEdog. Suec. 1870, p. 19; Prodr. Monog, 
(dog. 1874, p. 7. 
Var. VULGARE, Wittr. l. c. 
Crass. cell. veget. 65-104; altit. 31—4-plo major; 
»  OOgon. 22-246; 5, 175-21y. 
Hab. In artificial tank, Peradeniya. 
11. Gpocontum Perri, Wittr. Prodr. Monog. (Edog. 1874, p. 6; Hirn, in Act. Soc, 
Scient. Fennic:e, xxvii. 1900, p. 154, t. 24. fig. 197. 
Crass. cell. veget. 5-84; altit. 3-5-plo major ; 
$5 oogon. 21:5-25 MS » 21-27 [M 
»  Oospor.20:5-215,4; ,, 16-184. 
Hab. Stream, Victoria Park, Colombo. 
12. GipoGontuM PLATYGYNUM, Wittr. Prodr. Monog. (Edog. 1874, p. 17. 
Crass. cell. veget. 5-577 p; altit. 4—5-plo major; 
vn oogon. 195-22; , 10-195. 
Hab. Stream, Victoria Park, Colombo. 
.13. (EDoGONIUM SUBOCTANGULARE, sp. n. (Pl. 17. figs. 1, 2.) Œ. monoicum, oogoniis 
singulis, rectangularibus, levissime inflatis; membrana oogonii crassa (3:4—9'8 m) 
fuscescente ; oosporis subrectangulari-ellipticis, oogonia complentibus angulis 
demptis; cellulis suffultoriis eadem forma ac cellulis vegetativis ceteris; spermo- 
goniis bicellularibus, sparsis. 
Crass. cell. veget. 50-54 4 ; altit. 31—42-plo major ; 
a  oogon. 53-0754; , 82-924; 
,  Oospor. 54-60u; , 73-85; 
».  spermogon. 41-48; ,, 25-27 n. 
Hab. Paddyfield between Kosgoda and Urahaighasmahendai. 
The large size of this C@dogonium and the rectangular oogonia containing the 
suboctangular spores easily distinguish it from any other species. 
14. CEDOGONIUM PYRULUM, Wittr. in Botaniska Notiser, 1872, p. 2; Hirn, /. c. p. 158, 
t. xxv. fig. 136. 
Crass. cell. veget. 8-115 4; altit. 3—41-plo major ; 
»  oogon. 26-29 u; ,, 27-3454n; 
,  oospor. 29-974; „ 20-27 n: 
„  spermogon 8-954; ., 571 n. 
Hab. Stream, Victoria Park, Colombo. 
