SOME DESMIDS OF THE UNITED STATES. 307 
gpherico-elliptiez, apicibus subdepressis ; a vertice vise latissime 
elliptiee ; membrana granulata, granulis in seriebus verticalibus 
20 et horizontalibus 16 regulariter ordinatis. 
Long. 104 u; lat. 70 p; lat. isthm. 28 u; crass. 58 y. 
Hab. Florida (H. J. no. 514). 
We consider this a very distinet species; its form, the 
arrangement of its numerous granules, and its great thickness 
being very characteristic. The nearest species to it is C. con- 
spersum, Ralfs, var. rotundatum, Wittr., from which it is easily 
distinguished by the rounded form of its semicells, its proportion- 
ately greater length, its more numerous series of granules, and 
the form of its vertical view. It might also be compared with 
C. latum, Bréb. 
106. CosMARIUM RENIFORME, Arch. in Journ. Bot. xii. (1874) 
p. 92.—C. margaritiferum var. reniformis, Ralfs. 
Long. 53 p; lat. 43 u ; lat. isthm. 16 u. (Pl. 17. fig. 9.) 
Hab. New Baltimore, Mich. 
Var. compressuM, JVordst. in Botan. Notiser, 1887, p. 159; in 
K. Sv. Vet.- Akad. Handl. xxii. no. 8, p. 46, t. 5. f. 5. 
Long. 55 p; lat. 53 u; lat. isthm. 17 p; crass. 27 p. (Pl. 17. 
fig. 10.) 
Hab. Laconia, N.H. (H. J. no. 661). 
Var. ELEVATUM, n. var. (Pl. 17. fig. 11.) 
Var. semicellulis altioribus, diametro pene 14-plo longioribus, 
angulis basalibus subrectangularibus, lateribus in parte inferiori 
subparallelis. 
Long. 52 u; lat. 36 p; lat. isthm. 14 u; crass. 24 p. 
Hab. Whitmore Lake, Mich. (H. J. no. 434). 
107. C. Naruorsrit, Boldt,in Bih. till K. Sv.Vet.-Akad. Handl. 
Mi. no. 5, p. 20, t. 1. f. 21. 
Long. 53 u; lat. 44 p; lat. isthm. 12:5 y. 
Hab. New Baltimore, Mich. (H. J. no. 278). 
_ 108. C. Turprnir, Brób. in Mém. Soc. Sci. Nat. Cherbourg 
1. p. 127, t. 1. f. 11.—C. Turpinii, forma, Lund. ; C. Turpinii 
var. Lundellii, Gutw. 
Long. 70 u; lat. 50 p; lat. isthm. 14 p; crass. 36 p. 
Hab. Chester, S.C. (H. J. no. 625). Alma, Mich. (H. J. 
no. 619), 
