264 
PROCEEDINGS OF THE ACADEMY OF 
trie undulations, which curve abruptly upwards parallel to the truncate anal 
margin; these undulations are crossed by radiating rows of very small granules, 
only visible by the aid of a lens. 
The anterior muscular impression is oval, arcuate, and surmounted by a small 
accessory impression nearly detached from it. The posterior muscular impres- 
sion is broad oval, not very deep, and placed close up under the posterior ex- 
tremity of the dorsal edge ; from this impression, the pallial line descends, with 
a broad gently concave curve, so as to form a broad very shallow sinus. 
Length 2-85 inches ; height from ventral margin to middle of dorsal edge 1'3G 
inch ; do. from ventral margin to a line drawn from summit of beaks to the 
elevated posterior extremity 1-50 inch; greatest transverse diameter (near the 
centre) 1-11 inch; breadih of posterior hiatus 1-07 inch, height do 1-44 
inch. ^ 
Locality and position. — Leavenworth City, Kansas Territory, Coal measures. 
Allorisma? Cooperi. 
PanopcBa Cooperi, Meek and Hayden. Trans. Albany Inst. vol. iv. p. 11. 
March 2d, 1858. 
This species bears such a striking similarity, in form and general aj^pear- 
ance, to some of the Jurassic and Cretaceous Panopseas, that we were at first 
lead to refer it to that genus, supposing as we then did, that it was a Permian 
species. Since that time we have collected specimens of it in Kansas, show- 
ing that the hinge is edentulous, consequently it cannot be a Panopcea ; we 
therefore now refer it provisionally to the genera Allorisma, King, to which it 
appears most nearly related, though we are not quite sure it is a true Allorisma. 
We found it ranging^ through a considerable thickness of the upper coal 
measures, but we do not think it ranges quite up into the Permian. 
Locality and position. — Near Helena, Kansas Territory, Upper Coal Measures. 
Pleurotomaria subturbinata, n. sp. 
Shell rather thick, obliquely conical ; spire moderately elevated, pointed at 
the apex ; volutions six to six and a half, convex and angular in the middle, 
obliquely concave above, and having around the middle of the last one, just 
below the angle, a rather narrow revolving shallow sulcus. Umbilical region 
not much depressed, but perforated by a very small pit ; aperture suborbicular. 
Surface ornamented by small revolving lines, only preserved on the under and 
outer sides of the body whorl in our specimen, which is somewhat worn, and 
shows no lines of growth. The angle on the middle of the whorls appears to 
he double, or composed of two closely set parallel lines ; suture linear but 
distinct. 
Length 0'36 inch ; breadth 0*29 inch ; spiral angle regular, divergence 69*. 
Locality and position. — Same as last. 
Pleurotomaria humerosa, n. sp. 
Shell ovate turbinate ; spire turreted, moderately elevated and pointed at 
the apes. Volutions five to five and a half, very convex, more or less ob- 
liquely flattened or a little concave above, rounded below, and distinctly an- 
gular at the outer margin of the upper flattened side. Suture distinct ; um- 
bilical region slightly depressed, and having a very small perforation. Surface 
ornamented by about ten rather strong revolving lines, only four of which are 
visible on the turns of the spire, below the angle ; on the obliquely flattened 
space above, there are usually six or seven revolving striae, which are not more 
than half as large as those below the angle. Aperture suborbicular. No lines 
of growth are visible on our specimens, which are somewhat worn. 
Length 0*62 inch ; breadth 0-50 inch, spiral angle about 62°. 
Locality and position, — Grasshopper creek, K. T., Coal Measures. 
[Dec. 
