SOME DESMIDS OF THE UNITED STATES. 283 
Wake Forest, N.C. “Some specimens showed a wide gelatinous 
covering around the cells.” 
18. CrosrERIUM BRAUNII, Reinsch, Algenfl. Franken in Abh. 
Naturhist. Ges. zu Nurnberg, iii. (1866) p. 196, t.12.f.5; Joshua 
in Journ. Bot. xxiii. (1885) p. 35, t. 254. f. 9.—C. areolatum, 
H. C. Wood, 1874; C. maculatum, Hastings, 1892. 
Lat. circ. 50 p. 
Hab. Clay Co., Kansas, abundant (1895) (H. J. no. 636). 
19. C. pecoruM, Bréb. in Mém. Soc. Sci. Nat. Cherbourg, 
iv. p. 151, t. 2. f. 39. 
Lat. circ. 32-40 p. 
Hab. Bridgeport, Conn., occasional (H. J. no. 331) New 
Baltimore, Mich., frequent (H. J. no. 330). 
20. C. DErPoxTII, Wolle, in Bull. Torr. Bot. Club, xii. (1885) 
p. 2.— C. Ralfsii, Bréb., var. Delpontii, Klebs, 1879; C. crassum, 
Delp. (non Rabenh.). 
Lat. 25-31 p. 
Hab. Staten Island, N.Y., very abundant (H. J. nos. 401 & 419). 
Bridgeport, Conn. Near Tallahassee, Florida. Easton, Conn., 
abundant in brook. Seattle, Wash., frequent. 
21. C. pretoneum, Bréb. in Mém. Soc. Sci. Nat. Cherbourg, 
iv. p. 152, t. 9. f. 41. 
Long. 710 p; lat. 19 p. 
Hab. Seattle, Wash., scarce. 
22. C. umwEATUM, KEhrenb.; Ralfs, Brit. Desm. p. 178, 
t. 30. f. 1. 
Var. costatum, Wolle, Alg. U. S. p. 25, t. 61. f. 3. 
Long. 820 u; lat. 30-32 y. 
Hab. Wake Forest, N.C., occasional (H. J. no. 521). “ Seems 
to be distinctly this form, but one specimen recently divided 
shows imperfectly more numerous strim on the new half.” 
Bridgeport, Conn. (1893 and 1895). 
l 23. C. MACILENTUM, Bréb. in Mém. Soc. Sci. Nat. Cherbourg, 
W. p. 153, t. 9. f. 36. 
Long. 560 u; lat. 16-20 p. 
Hab. New Baltimore, Mich. (H. J. nos. 286 & 303). Burlington, 
ans., in ponds with Azolla. 
