BIRDSEYE LIMESTONE. 
41 
67. 2. MURCHISONIA? ANGUSTATA (n. sp.). 
Pl. X. Figs. 2 a, b. 
Subulate, elongated, narrow ; spire long, sharp ; volutions about nine or ten, rounded ; 
suture simple ; aperture nearly circular; surface ? Length ^ to | of an inch. 
The form of this shell is well preserved in several specimens, but the surface is too much 
eroded to define its markings. There is, in some specimens, obscure evidence of a carination 
on the outside of a few of the lower whorls. 
Position and locality. In the higher part of the Birdseye limestone, associated with 
Phytopsis cellulosum. 
68. 3. MURCHISONIA VENTRICOSA ( n. sp.). 
Pl. X. Fig. 3. 
Conical, abruptly tapering ; breadth about half the length ; volutions about five, ventri- 
cose, subangulated above, rapidly enlarging towards the aperture ; surface covered with 
longitudinal arched threadlike striae, which, tending backwards from the suture, bend 
forward after passing over the angle of the whorl. 
In the specimen under examination, the strife are only partially visible, except on the 
upper part of the volutions : they are precisely like those on the species of Loxonema known 
to me ; but the angular elevation along the upper part of the volution indicates that this 
may be a species of Murchisonia, the Loxonema being destitute of such a carina. In the 
cast, there is no evidence of the band marking the carina as in Murchisonia, but the striae 
bend forward in the same manner on the lower part of the volutions. 
Position and locality. In the higher part of the rock, where it passes into the Trenton 
limestone. Tribe’s-hill, Mohawk valley. (State Collection.) 
69. 4. MURCHISONIA PERANGULATA (n.sp.). 
Pl. X. Fig. 4. 
Fusiform; spire long, acute; volutions rapidly diminishing in size, angular on the 
middle, appressed above and below, except the last one, which is somewhat ventricose. 
There are some obscure traces of striae, and of the spiral band, which enables us to refer 
the shell to the Genus Murchisonia, but it has been so much macerated as nearly to 
obliterate these markings. The shell is readily recognized by the strongly angulated whorls, 
which, above the lower one, are not ventricose. 
Position and locality. It occurs in a siliceous cherty mass of the Birdseye limestone, 
associated with fragments of shells, corals, etc., near the upper termination of the rock. 
Watertown, Jefferson county. (State Collection.) 
[ Paleontology.] 
6 
