804 MESSRS. W. WEST AND G. S. WEST ON 
Long. 11:5-15 p; lat. 12:5-17 p ; lat. isthm. 3-45 p. 
Hab. Harvey Lake, Pennsylvania. 
93. CoswARIUM SUBCRENATUM, Hantzsch, 1861; Nordst. in 
Ofvers. K. Vet.-Akad. Forh. 1875, no. 6, p. 21, t. 6. fË. 10, 11. 
* Zygospores spherical, about 32-35 p in diameter, clothed 
with scattered spines 8-10 u long suddenly rising from a conical 
base, apices slightly fureate." 
Hab. Arlington, Mass. (H. J. nos. 68 & 71). 
94. C. rumens, Wordst. in Ofvers. K. Vet.-Akad. Fork. 1872, 
no. 6, p. 36, t. 7. f. 23. 
Var. GLABRUM, n. var. 
Var. cellulis glabris, granulis nullis. 
Long. 52 u; lat. 35  ; lat. isthm. 24 p; crass. 30 p. 
Hab. Wyoming, Pa. (H. J. no. 457). 
95. C. ROSTAFINSKII, Gutw. 1890; in Sprawozd. fizyjogr. 
Akad. Umiej. Krakow. xxvii. (1892) p. 67, t. 3. f. 16. 
Var. AMERICANUM, n. var. (Pl. 17. fig. 13.) 
Var. semicellulis apieibus truncatis, supra isthmum glabris; 
a vertice visis tumore glabro utrobique. 
Long. 32 pu ; lat. 24 u; lat. isthm. 11 p; crass. 16 p. 
Hab. Palo Alto, Calif. (H. J. no. 558). 
96. C. wopEsruM, n. sp. (Pl. 17, fig. 12.) 
C. parvum, circiter 11-plo longius quam latum, profundissime 
constrictum,sinu angusto-lineari; semicellule pyramidato-trapez- 
formes, angulis basalibus rectangularibus, lateribus convexis eum 
crenis 4, iis apices versus majoribus et truncatis (vel levissime 
emarginatis), apicibus truncatis rectisque, intra crenas et apicem 
eum granulis minimis indistinctis concentricis et radiantibus; 8 
latere vise late ovatæ; a vertice visse elliptice cum tumore lato 
utrobique; pyrenoidibus singulis. 
Long. 33 p; lat. 26 p; lat. isthm. 7 p; crass. 17 p. 
-Hab. Whitmore Lake, Mich. (H. J. no. 439). 
Compare with C. costatum, Nordst., and C. aphanichondrum, 
Nordst. 
97. C. POLYMORPHUM, Nordst. in Vidensk. Medd. Naturh. 
Foren. Kjóbenh. 1869, nos. 14-15, p. 209, t. 3. f. 31. 
. Long. 36 p; lat. 28 p; lat. isthm. 7 p; crass. 20 p. 
Hab. De Land, Florida (H. J. no. 611). 
