82 Teo Lk, (GIGUAGIE NC 
extremity. The two layers of the flattened funnel-shaped polypary are 
pressed almost into contact, which circumstance, together with the slightly 
slicken-sided condition of the specimen, renders its accurate specific descrip- 
tion difficult. Enough, however, can be made out to state that, as flattened, 
the polypary is flabellate, 4o™™ in length, and the same in breath, of a tri- 
angular shape, with the distal side of the triangle rounded. The branches of 
the polypary are subparallel, very gradually diverging, about 1.5™™ apart, 
forking into two branches several times in their course towards the periphery. 
Horizon and locality. 
Upper Dicellograpsus zone, Magog, Canada. 
1 have compared this form with the other species of the genus, and espe- 
cially with those forms which approach it in vertical distribution. Only two 
species have heretofore been described from approximately the same horizon, 
VizZ., D. moffatense Lapw., and JD. meenah Hall. With the former of these 
the present form needs no comparison. The latter species was described 
from the Trenton limestone of Wisconsin. 
Dictyonema perexile Gurley, sp. nov. 
Dictyonema delicatulum Dawson, 1883, Can. Nat. and Quart. Jour. Sci. X., 
pp. 461-3; “D. n.sp. (=D. delicatulum Dawson, preoccupied)” 
Ami, 1889, Ann. Rep. Geol. Surv. Can. for 1887, p. 117 K.). 
Proposed to replace Dawson’s delicatulum, that name having been pre- 
viously used by Lapworth (Quart. Jour. Geol. Soc., London, 1881, XXXVI, 
Os UY/2o)) 
Dictyonema actinotum Gurley, sp. nov. 
Dictyonema hamiltonie Wall, 1865, Can. Org. Rem., Dec. 2, p. 58; 
nonien nudum. 
Specimens seen very incomplete. Branches radiating rapidly, bifurcating 
mostly near the base (in correspondence with their rapid radiation) rather 
conspicuously longitudinal-striate, 0.5-0.6™™ wide, 25-30 in 25™™. Dissepi- 
ments rather stout, wiry, apt to be curved, transverse or slightly oblique. 
Meshes subquadrangular or with rounded angles. Thecz present but indis- 
tinct. Length of mesh uncertain, perhaps 2—2.5™. 
Horizon and locality.—Devonian (Hamilton formation), Kashong Creek, 
Cayuga county, New York. Several specimens badly preserved, but 
apparently of this species, occur in the Hamilton at Moscow, N. Y. 
Dictyonema blairt Gurley, sp. nov. 
Proximal end of polypary unknown. Branches radiating slowly, sub- 
parallel, usually scarcely but nearly 0.4™™, occasionally 0.5™, ad max., and 
arranged transversely about 20-25 in25™™. Interspaces generally about one 
and one-half times as wide as branches or slightly more. Dissepiments rather 
slender, about 0.25", thick ad max. Sometimes straight. Usually more or less 
