28 GEOLOGICAL SURVEY OF THE TERRITORIES. 
brate Paleontology No. 1, in the Annual Report of this Survey for 1877. 
The following is Mr. Meek’s description of this species, together with 
his remarks upon the same: 
‘Shell small, depressed-ovate, or broad slipper-shaped; apex very 
small, and depressed to the posterior margin, where it forms one or two 
minute, slightly oblique, compact turns, that do not project beyond the 
margin, but are sometimes even slightly overlapped by it; inner lip very 
_ broad, or shelf-like, and occupying more than half the under side, con- 
vex, and more or less thickened, with the inner margin concave in out- 
line at the middle, and provided with a slight projection on each side, 
but not properly crenate or dentate; outer lip rather thick, obtuse, nearly 
or quite smooth, and continuous around the margins with the inner one; 
aperture small and transversely semicircular. Surface polished, and or- 
namented by from fifteen to twenty light yellowish or cream-colored 
simple radiating coste, separated by shallow, light brownish furrows of 
about the same breadth ;* lines of growth moderately distinct. 
‘‘Length, 0. 31 inch; breadth, 0.25 inch; convexity, 0.12 inch. 
“JT am in some doubt in regard to the proper disposition to make of 
this little shell. In most of its characters it seems to conform pretty 
nearly with Dostia Gray, generally regarded as a subgenus ‘under YVeri- 
tina Lamarck (=Neritella Humphrey). It has a much smaller and less 
prominent spire, however, and a more convex and broader inner lip than 
the type of that group, and also wants the crenulations of the inner lip 
seen in the same. Inits limpet-like form, tumid, greatly developed inner 
lip, and minutely coiled apex, it approaches Velates Montfort, and I am 
not quite sure that it would not be nearer right to eall it Velates bella- 
tula. Still it differs from the typical form of that genus in having its 
apex depressed to the posterior margin, instead of being elevated and 
nearly central, while the margin of its inner lip wants the distinct den- 
ticulations seen in that of that shell. 
“Of course if Humphrey’s catalogue genera are to be adopted on ac- 
count of priority of date over those.of Lamarck and others that were 
accompanied by diagnoses, the name of this shell, supposing the view 
here adopted in regard to its affinities to. be correct, would become Nerv- 
tella (Dostiay bellatula. Ee 
“ Locality and position.—Carleton’s coal mine, Coalville, Utah.” 
NERITINA (VELATELLA) CARDITOIDES Meek. 
Plate 12, fig.:7 a. 
gate ey carditoides Meek, 1873, An. Rep. U. S. Geol. Sur. Terr. for 1872, p. 
This form certainly belongs to the same type as the preceding, and 
there appears to be some ground for suspecting them to belong to one 
and the same species. All the specimens in the collection of both this 
and the other form are more or less imperfect, however, and I therefore 
prefer to treat them as separate species in this article, as Mr. Meek has 
dune. The following is his diagnosis of this form: 
“Shell attaining a moderately large size, broad, oval and depressed 
in form, apex posterior and nearly or quite depressed to the margin, ap- 
parently subspiral; inner lip very broad or forming more than half the 
under side, rather thick, smooth, and nearly flat, or somewhat convex, 
with its straight inner margin sharp and without teeth or erenulations; 
“Of course the colors mentioned are not known to present the same tints in the 
fossil shells that ornamented them when the animal was alive.” 
