SOME DESMIDS OF THE UNITED STATES. 293 
paucioribusque ; lobo polari latiori et apice convexo, marginibus 
lateralibus cum spina singula preeditis. 
Borgesen’s dimensions are:—Long. 55 u; lat. 35 yg; lat. 
isthm. 65 u; crass. 21 u. 
Hab. Brazil. 
This differs from var. integrius in its more rectangular lateral 
lobes, the lateral margins of which are even slightly divergent ; 
the apex of the polar lobe is also much more convex. 
Var. inrEartus, West ¢ G. S. West, Trans. Linn. Soc. Ser. II. 
(Bot.) v. p. 244, pl. 14. ff. 23-25. — E. spinosum, Wolle, Desin. 
U. S. p. 106, pl. 27. ff. 4—7, 17 (1884), «on E. spinosum, Ralfs 
(1844). 
Var. lobo polari eum spina singula (vel spinulis binis) utro- 
bique infra spinam majorem, incisura infra lobum polarem 
majore et latiore, lobis lateralibus non divisis sed subretusis, 
quadridenticulatis. 
Long. 52-61 p; lat. 32:5-41 p; lat. isthm. 95-10 y; lat. lob. 
polar. 24-30 u; crass. 22-27 p. (Fig. xylogr. 1 d et e.) 
Hab. Minneapolis, Minnesota ; De Land, Florida ; Bridgeport, 
Conn.; Harvey Lake, Pa. 
E. clavatum, W. B. Turn. (l. c. p. 85, t. 11. f. 18), may be a 
form of this variety, but it is insufficiently described and figured, 
and must therefore be held as doubtful. 
94. Evasrrum PrCTUM, Borgesen, l. c. p. 939, t. 3. f. 19. 
Var. SUBRECTANGULARE, n. var. (Fig. xylogr. 1f.) 
Var. minor, semicellulis in parte inferiore subrectangularibus, 
angulis basalibus leviter divergentibus, sub lobum polarem minus 
Constrictis, in centro cum seriebus verticalibus tribus granulorum, 
Supra ea granulis magnis duobus positis, et granulo magno 
singulo juxta incisuram apiealem utrobique, etiam granulis 
nonnullis minoribus intra margines. 
Long. 99 u; lat. 35 u; lat. lob. polar. (e. spin. apical.) 33 p; 
lat. isthm, 9-5 n. 
Hab. Malaga, New J ersey. 
55. E. OCCIDENTALE, n. sp. à 
E. verrucosum, Ehrenb., var. simplex, Joshua, in Journ. Bot. (1885), 
Xi. p.34 t, 984. f 2; West, in Journ. Roy. Mier. Soc. 1890, p. 287. 
fs practi, var. simpler forma tumescens, W. B. Turn. in K. Sv. 
“Akad. Handl. xxv. no. 5, p. 74, t. 11. f. 9*. Cosmarium pro- 
tract 7 i . a | 
e Bary olle, Desm. U. S. p. 83, pl. 17. ff. 27, 98; non C. protractum 
