— 187 — 
St. dilatatum, Ehrb. — var. alternans, Breb. — 
St. punctulatum, Breb. — St. polymorphum, Breb. 
—- St. ceyrtoceron, Breb. — St. paradoxum, Meyen. 
— St. gracile, Ralfs. — St. hirsutum, Breb. — St. 
teliferum, Ralfs. —St.Saxonicum, Bulnh. 
— St. polytrichum, Perty. — St.spongiosum, 
Breb. — St.controversum, Breb. — St.ves- 
titum, Ralfs. — St.oxacanthum, Archer. — 
St. furcigerum, Breb. — St. lunatum, Ralis. — 
St. munitum, Wood. The following four are considered 
new species. 
St.bibrachiatum, n.sp., segments subquadran- 
gular, or cuneate, gradually widening upward, truncate at 
ends, lateral extremities each tapering into a single, elongate 
divergent colorless process, rough or denticulate on the mar- 
gins. Arms two to three times as long as the body. End 
view elliptical, with a single process at each end, tips ob- 
tuse dentate. — .00187"—.00225° long with arms. 
.0015—.0016° wide. 
St.cuneatum, .n.sp. Frond as long as wide. Seg- 
ments broadly cuneate with convex bases, producing in front 
view deep constrictions between them. Sides converging 
from the base upward to a truncate end, each with three 
to six sharp teeth, spaces between them deep inverted cre- 
nulations. End view triangular, sides somewhat concave, 
angles bi-trifid, with six radiating central processes rarely 
extending beyond the sides. .00175'—00225‘' each way. 
St. binaculeatum, n. sp. Frond smooth, front 
view subelliptical, inner margins more convex than the outer, 
angles with two spines separated at the base. End view 
triangular, sides slighty concave, angles bluntly rounded with 
two rather long more or less divergent spines on each. 
.0015° long, .002“ wide. 
St.cruciat um, n.sp. Frond small, smooth, front 
view cruciform, the arms mammillare, sinus wide, obtuse 
angled. End view three or four lobed, each slightly tape- 
ring, ends rounded with a number of more or less diver- 
ging setae, as long as the lobes, on the ends of each. 
.001' without setae. 
17) Xanthidium, Ehrb. —X. fasciculatum, Ehrb. — 
ditto var. antelopocum, Ktz. — ditto var. 
polygonum, Ehrb. 
18) Arthrodesmus, A convergens, Ehrb. 
(Torrey Botanical Bulletins 1876. Suppl.) 
