SOME DESMIDS OF THE UNITED STATES. 308 
inflation. The breadth of the isthmus in var. Schliephackianum 
is somewhat variable. 
87. CosMARIUM EXIGUUM, Arch. in Proc. Dubl. Nat. Hist. Soc. 
1864, p. 49, pl. 1. ff. 32-33; Nordst. in K. Sv. Vet.-Akad. 
Handl. xxii. no. 8, p. 58, t. 6. f. 12 (1888). 
Forma major, semicellulis rotundatioribus ; long. 4l, ; lat. 
24 u; lat. isthm. 9 p. 
Hab. Whitmore Lake, Mich. (H. J. no. 559 a). 
Forma angulis basalibus rectangularibus et sinu angusto 
lineari; long. 17 p; lat. 10 p; lat. isthm. 4 p; crass. 6 y. 
(Pl. 16. fig. 15.) 
Hab. Florida. 
88. C. REGNELLII, Wille, var. MADAGASCARIENSE, West & G. 
S. West, in Trans. Linn. Soc. Ser. IT. (Bot.) v. p. 58, pl. 6. f. 39. 
Long. 17 p; lat. 19 p; lat. isthm. 4 p. 
Hab. De Land, Florida. 
89. C. DIFFICILE, Lüfkem. im Verhandl, d. k.k. zool.-botan. 
Ges. Wien, xlii. (1892) p. 551, t. 8. £. 3. 
Long. 31 u; lat. 20 p; Jat. isthm. 6 p. 
Hab. Harvey Lake, Pennsylvania. 
90. C. REPANDUM, JVordst. in Botan. Notiser, 1887, p. 162; in 
K. Sv. Vet.-Akad. Handl. xxii. no. 8, p. 58, t. 6. f. 14 
(1888). 
Forma wrNon.—C. odontopleurum, Arch. in Ann. Scott. Nat- 
Hist. (1894), p. 169, t. 2. f. 13. 
Long. 15-17 p ; lat. 14-15:5 p; lat. isthm. 5'5 p. 
Hab. Harvey Lake, Pennsylvania. 
(Cfr. Borge, in Nuova Notarisia, 1896, p. 57 ; and West & G. 
S. West, in Journ. Bot. xxxv. (1897) p. 120.) 
31. C. Rzoxzsir, Reinsch, in Abhandl. Naturhistor. Gesellsch. 
Nürnberg, Bd. iii. p. 112, t. 7. f. 8. 
Long. 12 u; lat, 12 p 5 lat. isthm. 5 p; crass. 5 p. 
Hab. Laconia, N.H. 
: pa C. s1ocuLarum, Menegh.; Ralfs, Brit. Desm. p. 95, t. 15. 
Var. DEPRESSUM, Schaarschm. in Magyar. Tudom. Akad. Math. 
* Ternész, Közlem. xviii. (1882) p. 270, t. 1. £. 10. 
z2 
