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SOME DESMIDS OF THE UNITED STATES. 287 
40. Evasrrum SINUOSUM, Lenorm. (1845); Ralfs, Brit. Desm, 
p. 85, t. 13. f. 5a, b, c (1848). 
Long. 56-60 p; lat. 36-40 u; lat. isthm. 10 u; crass. 22 y. 
Hab. De Land, Florida, abundant (H. J. no. 600). 
4l. E. ansatum, Ehrenb. (1832); Ralfs, l. c. p. 85, t. 14. f. 2. 
Var. TURGIDUM, Börgesen, in Vidensk. Medd. f. d. naturh. 
Foren. Kjóbenhavn (1890), p. 938, t. 3. f. 15. 
Hab. Wake Forest, N.C., abundant (H. J. no. 535). 
“In some specimens the sides of the semicells are almost 
straight," 
42. E. SUBHEXALOBUM, n. sp. (Pl. 16. fig. 7.) 
E. parvum, cireiter 14-plo longius quam latum, profunde 
constrictum, sinu angusto-lineari; semicellule subtrilobe, lobis 
lateralibus oblique truncatis, marginibus truncatis ad sinum 
convergentibus, lateribus multo concavis, lobo polari lato subrect- 
angulari, angulis superioribus leviter rotundatis, apice convexo 
cum ineisurá profunde lineari in medio; a latere vise subovatz, 
apice rotundato-trur.cato, lateribus eum tumore singulo ad partem 
inferiorem ; a vertice vise elliptic, tumoribus binis ad medium 
utrobique. 
Long. 40 u; lat. 26 p; lat. isthm. 6 u; crass. 15 p. 
Hab. De Land, Florida (H. J. no. 586). 
This species is closely allied to E. quadrioculatum, West & G. S. 
West, but as it possesses distinet characters we think it should 
be considered as another species. It is distinguished from the 
above-mentioned Asiatic species by its proportionately broader 
cells, its different lateral margins and basal angles, as well as in 
the apex and the poles of the vertical view. 
43. E. pyramrparum, West, in Journ. Linn. Soc. xxix. (Bot.) 
P.139, pl. 20. f. 13. (P1. 16. fig. 14.) 
Long 28 u; lat. 20 u; lat. isthm. 6 p. 
Hab. Florida (H. J. no. 427 a). 
he figures of this species previously given (cff. supra) are 
ed bad and do not adequately represent the species; we 
erefore give a more accurate figure of an American specimen. 
43a. E. INTERMEDIUM, Cleve, in Ofvers. Sv. Vet.-Akad. Forh. 
(1864), no, 10, p. 484, t. 4. f. 1; Lund. in N. Act. R. Soc. Se. 
PS. Ser, TT, vii. no. 2, p. 21, t. 2. f. 4. 
The typieal American form of this species appears to have 
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