SOME DESMIDS OF THE UNITED STATES. 801 
77. CosmariuM BAILEYI, Wolle, Desm. U.S. p. 64, pl. 16. 
ff. 17, 18. 
Var. MAJOR, West & G. S. West, in Trans. Linn. Soc. Ser. II. 
(Bot.) v. p. 246, pl. 14. f. 36. 
Long. 70-80 u ; lat. 70 u; crass. 32 p. 
Hab. Tallahassee, Florida (H. J. nos. 549 & 550). 
78. C. PACHYDERMUM, Lund. in Act. R. Soc. Scient. Ups. 
Ser. III. ii. p. 39, t. 2. f. 15. 
Var. minus, Nordst. in Act. Univ. Lund, ix. (1873), p. 18, 
t. 1. f. 7. 
Long. 46-52 u; lat. 40—44 p; lat. isthm. 12 u. 
Hab. Cold Spring Harbour, N.Y., frequent (H. J. no. 153). 
De Land, Florida (H. J. no. 581). 
The examples were a little smaller than the Norwegian ones, 
and proportionately shorter; membrane strongly punctate. It 
approaches the Cosmarium mentioned by Nordstedt (in K. Sv. 
Vet-Akad. Handl., Bd. xxii. no. 8, p. 54, t. 5. f. 22), but is a 
little smaller and is also more deeply constricted. 
79. C. caPENSE, De Toni, Syll. Algar. p. 969.—C. pyramida- 
tum subsp. capense, JVordst. in Act. Univ. Lund. xvi. (1880), 
p. 6, t. 1. f. 8. 
Forma minor et isthmo latiori; long. 644; lat. 46; lat. 
sthm. 16. (Pl. 17. fig. 3.) 
Hab. Whitmore Lake, Mich. (H. J. no. 436). 
80. C. prrroratum, Lund. l. c. p. 40, t. 2. f. 16. 
Long. 6l p; lat. 57 p; lat. isthm. 34 p. 
Hab. Plymouth and Laconia, N.H., scarce (H. J. nos. 645 & 
646). Harvey Lake, Pennsylvania, frequent. 
8l. C. ocettarum, B. Kichler et Gutw. in Rosprawy. Akad. 
i "d Krakow. Wydzial. nat.-przyr. xxviii. (1894), p. 164, t. 4. 
Var. AMERICANUM, n. var. 
Var. longior, semicellulis cum lateribus levissime retusis et 
i "cibus subtruncatis, in centro incrassatis; a vertice visis ellip- 
ticis, incrassatis et late tumidis ad medium utrobique, tumore 
wWoquoque leviter retuso. 
Long. 29 u; lat. 24 p; lat. isthm. 5°7 p; crass. 198p. — 
8 variety differs from C. ocellatum var. incrassatum in its 
LINN. JOURN.—BOTANTY, VOL. XXXIII. Z 
