GASTROPODA 1071 
Subulites conradi.] 
mm., but in every other respect, as far as we can discover, they are absolutely 
identical. Moreover, the species is recognizable over a geographical range extending 
from Tennessee and Kentucky to Minnesota in one direction, and Ottawa, Canada, 
in another. 
SUBULITES CONRADI, 7. sp. 
PLATE LXXXI, FIGS. 4 and 5, 
Shell extremely elongate-fusiform; the spire slender, long, and tapering not much more gradually 
than the base, which is somewhat truncated; outline on each side gently arcuate, the lower part of the 
middle third of the length perfectly cylindrical; whorls flat, about four and a half in casts of the interior, 
the uppermost of these having an obtuse termination and a diameter of about 6 mm. in a specimen whose 
greatest diameter is about 15 mm.; whorls preceding this not observed; suture linear; aperture long, very 
narrow, expanding gradually from the suture, but contracting again near the base; body whorl tapering 
very gradually. 
This agrees rather closely with all that can be made out of Hall’s poor figure (Pal. N. Y., vol. i, pl. 
XXXIX, fig. 5a) of Conrad’s original type of S. elongatus, but as it differs from the other specimens figured 
by Hall, as well as from specimens obtained from Watertown, N. Y., said to be of Conrad’s species, we 
have hesitated to identify our species with S. elongatus. 
Formation and locality.—Stones River group, Goodhue county, Minnesota. A specimen recently 
received from Mr. W. R. Billings, of Ottawa, Canada, who collected it in rocks of the Black River group, 
associated with S. canadensis, near Ottawa, appears to be of this species. 
Collections.—EK. O. Ulrich (4 specimens); W. H. Scofield (6 specimens). 
SUBULITES CANADENSIS, n. sp. (Ulrich.) 
PLATE LXXXI, FIG. 3. 
Our figure of this species was made up from several fragments of a Subulites collected several years 
ago at Ottawa, Canada. At that time we supposed that the specimens belonged to S. elongatus Conrad, 
and the figure was prepared to show what we knew, or rather what we believed we knew, of that species. 
In going over the subject once more we concluded that it was certainly distinct from S. elongatus. Quite 
recently we received several specimens more of the same form from Mr. W. R. Billings, and learned that 
the species occurs at Ottawa, not in the Trenton limestone, as we supposed, but in the Black River group. 
As the species seems to be a well-marked form, and distinct*from all others known to us, we propose to 
designate it as above. It is amore robust species than S. conradi (one of the fragments before us indi- 
cates a total hight of at least 120 mm.), with the aperture wider below, the whorls slightly convex in the 
spire, and the body whorl more ventricose and tapering more rapidly, while the spire tapers more regu- 
larly and more rapidly. The greatest diameter of the largest fragment is 22 mm. 
Formation and locality.—Black River group, Lot 3, Con. 3 R., Gloucester, near Ottawa, Canada. 
Collection.—E. O. Ulrich. 
SUBULITES DIXONENSIS, 7. Sp. 
PLATE LXXXI, FIGS. 6—8. 
This form is distinguished from S. conradi by its wider aperture and more distinct basal truncation; 
also by the peculiar fullness near the middle of the body whorl, and the more rapid taper downward caused 
thereby. These differences are shown very clearly by our figures of the two species on plate LX XXI. 
Formation and locality.—Three specimens were collected at Dixon, Illinois, where they occurred in 
the upper part of the Stones River group. 
Collection.—H. O. Ulrich. 
