314 MESSRS. W. WEST AND G. 8. WEST ON 
137. SrAvRAsTRUM PACHYRHYNOHUM, JVordst. in Ofvers. K. 
Vet.-Akad. Forh. 1875, no. 6, p. 32, t. 8. f. 94. 
Long. 31-3455 u; lat. 31:5-35 u; lat. isthm. 8-9°5 y. 
Hab. Harvey Lake, Pennsylvania. Minneapolis, Minnesota. 
138. S. sUBLEVISPINUM, n. sp. (Pl. 18. figs. 20-22.) 
S. parvum, 13-plo latius quam longum (cum processibus), 
profunde constrictum, sinu aperto et obtuso ; semicellule cor- 
pore inconspieuo, processibus digitatis duobus late divergentibus, 
marginibus processuum parallelibus ad apices subito attenuatis; 
a vertice vise triradiate, corpore inconspicuo; membrana 
glabra. 
Long. 25 p; lat. 37 p; lat. isthm. 7 p. 
Hab. Laconia, N.H. (H. J. no. 651). 
This species approaches S. levispinum, Biss., but is relatively 
very much broader, has much less body, and has cylindrical 
processes only attenuated at their extremities. 
139. S. PSEUDOTETRACERUM, West & G. S. West, in Trans. 
Linn. Soc. Ser. II. (Bot.) v. p. 79, pl. 8. f. 39.—8. contortum, 
Delp., var. pseudotetracerum, Nordst. in K. Sv. Vet.-Akad. 
Handl. xxii. no. 8, p. 50, t. 5. f. 14. 
Long. s. proc. 15-17 p, c. proc. 24-27 p; lat. c. proc. 21-22 p 
lat. isthm. 5:5 p. 
Hab. Harvey Lake, Pennsylvania. 
140. S. IRREGULARE, West, in Journ. Roy. Micr. Soc. 1894, 
p. 12, pl. 2. ff. 49, 50. 
Long. s. proc. 95 p, e. proc. 20 p; lat. e. proc. 17-24 p; lat, 
isthm. 55 p; crass. 9 p. . 
Hab. Harvey Lake, Pennsylvania. Whitmore Lake, Mich, 
(H. J. no. 451). De Land, Florida. 
141. S. renvisstuum, West & G. S. West, in Trans. Linn. 
Soc. Ser. II. (Bot.) v. p. 78, pl. 8. f. 43. 
Long. s. proc. 11:5 p, c. proc. 23 p; lat. s. proc. 9p 
29 u; lat. isthm. 4 y. 
Hab. De Land, Florida. 
e, proce 
142. 8. toranum, Wolle, 1884; Desm. U.S. p. 137, pl. 41. 
ff. 5-7. 
The plants seen by Johnson and regarded by him as most 
