26 GEOLOGICAL SURVEY OF THE TERRITORIES. 
“ Although the specimens show the pattern or style of the original 
coloration of this shell quite distinctly, the colors themselves may, of 
course, have been different in the living shell. Usually the zigzag mark- 
ings are quite distinct on the specimen as found, but on some examples 
the bands are blended, and become fainter, so that the surface merely 
presents a light brownish tinge. Itis always polished, however, on all 
the specimens seen. 
“This species seems to be more nearly allied to WV. nebrascensis M. 
& H., from the Jurassic beds, near the head of Wind River, than .to 
any other form with which Iam acquainted. It may be readily distin- 
guished, however, by its more depressed spire, and the slight flattening 
of its volutions above, as well as by its more flattened and more concave 
inner lip. It likewise attained a larger size than any of the specimens 
of that species I have seen. It is one of the most abundant shells ob- 
served at the locality, and is usually found in a better state of preser- 
vation than any of its associates. 
“ Position and locality.—Carleton’s coal mine, Coalville, Utah.” 
This species is closely related to V. incompta White, from marine Cre- 
taceous strata at Hilliard Station, about 40 miles northward from Coal- 
ville, and which is figured on plate 7 of Contributions to Invertebrate 
Paleontology No. 1, Annual Report of this Survey for 1877; but its dif- 
ferences are pointed out in connection with the accompanying descrip- 
tion of that species. 
NERITINA PISIFORMIS Meek. 
Plate 12, figs. 9 a, b, and e. 
Neritina pisiformis Meek, 1873, An. Rep. U. 8. Geol. Sur. Terr. for 1872, p. 500. 
This shell is found associated with N. piswm Meek, which is figured 
on plate 7, accompanying Contributions to Invertebr ate Paleontology 
No. 1, in the Annual Report of this Survey for 1877, and also with many 
other "forms in the marine Cretaceous series of strata exposed at Coal- 
ville, Utah. The figures on: plate 12 have been drawn from one of Mr. 
Meek’s types, enlarged two diameters, while those of NV. piswm, just re- 
ferred to, are ‘ot natural size. In size and general aspect the two species 
are closely alike, as may be seen by comparing the figures of both, and 
as has also been pointed out by Mr. Meek. ‘The following is his descrip- 
tion of this species: 
“Shell smail, subglobose, or obliquely rhombic, the height being 
slightly less than the oblique breadth; spire rather prominent for a 
species of this genus ; volutions three to three and a half, convex; aper- 
ture subovate, considerably contracted by the flattened, moderately 
wide inner lip, which is nearly straight on its inner mar ein, and pro- 
vided there with four small denticles, the upper one of which is largest; 
surface smooth. 
‘‘ Height, 0.30 inch ; greatest oblique breadth, 0.32 inch. 
“This little shell agrees so nearly in size and form with the described 
species (N. pisum) that they may be readily confounded, as they are 
found with the aperture filled with rock. 
““A fortunate fracture of one of the specimens exposed the inner edge 
of its flattened columella, however, and thus enabled me to see that it is 
denticulated, and in this respect differs from Neritina pisum, which seems 
to be entirely without teeth. Further comparisons also show the two 
shells to differ in form, that under consideration having a more promi- 
- nent spire and a more ’elobose outline, being less oblique. 
