1903] Cushman, — New England Desmids, — II 255 
13. Closterium Ensis Delp. Diam. 42 p, length 550 wm The 
diam. of this specimen exceeds that given by Wolle. Not infrequent. 
New to New England ( H. C. no. 344.) 
14. Closterium juncidum Ralfs. This species was noted among 
the fresh material with excellent zygospores. 
15. Closterium striolatum Ehrb., var. intermedium Ralfs. Diam. 
56 p, length 490 p. About 24 striae in all, distant. Frequent. 
The variety is new to New England. (H. C. no 371.) 
16. Closterium Venus Kg. Diam. 10 p, length across ends 48 y. 
Frequent. (H.C. no. 384.) 
17. Docidium Trabecula ( Ehrb.) Naeg. Diam. at middle 28 
p, at end 16 p, length 440 y. Common. ( H. C. no. 480.) 
18. Calocylindricus connatus (Bréb.) Kirch. Diam, 63-65 y, 
length 83-87 p, isth. 45-50 m. The isthmus seems to be slightly 
narrower than in the figures given by Wolle. Common. (H. C. 
nos. 389 & 381.) 
19. Cosmarium Broomei Thwaites. Diam. 32 yp, length 34 y, 
isth. 12 pw. Frequent. (H.C. no. 377.) 
20. Cosmarium capense Nordst. The specimen compares well 
with the figure given by W. & G. S. West (Jour. Linn. Soc. Lond. 
Bot. xxxii, p. 301, Pl. 17, f. 3.) Rare. Mew to New England. 
(H. C. no. 480.) 
21. Cosmarium laeve Rab., var. septentrionale Wille. Diam. 21 p, 
length 27 x. Common. New to Maine. (H. C. no. 377.) 
22. Cosmarium nitidulum DeNot. Diam. 42 pm, length so y, 
isth. r5 p. Like the figure and description but considerably larger 
than the measurements given by Wolle. Rare. New to Maine. (H. 
C. no. 372.) ; 
23. Cosmarium Fortianum Archer. Diam, 25 m, length 36 p, 
isth. 9 4. Reported but once before from New England, then also 
from Maine. Rare. (H. C. no. 377.) 
24. Huastrum sp. Two species of this genus were found -but 
are not yet identified. 
25. Staurastrum muticum Bréb., var. minus Wolle. Frequent. 
(H. C. no. 347.) 
Boston SOCIETY OF NATURAL HISTORY. 
