WHITE. ] CRETACEUUS FOSSILS. 2% 
“In size and general appearance it also closely resembles small 
examples of Neritina compacta Forbes, from the Cretaceous rocks of 
India, but it is less oblique, or more globose in form, and has four den- 
ticles instead of only three on its columella. It is possible that I should 
call it Nerita pisiformis, as the denticulations of its columella are rather 
strongly developed for a Neritina, in which genus the columella is 
usually smooth, or only finely crenate. Its general aspect, however, is 
more like species of the latter group. 
“ Locality and position.—Coalville, Utah, from the Cretaceous beds 
below the lower heavy bed of coal mined there. 
Subgenus VELATELLA Meek. 
No diagnosis of this type having yet been published, although Mr. 
Meek proposed a name for it on p. 499 An. Rep. U. S. Geol. Surv. 
Terr. for 1872, I propose the following diagnosis, which is drawn from 
all the yet known forms belonging to it, namely: Neritina ( Velatella) 
bellatula and N.(V.) carditoides Meek, from the estuary Cretaceous strata 
at Coalville, Utah; WN. (V.) patelliformis Meek, and var. weberensis 
White, from the marine Cretaceous strata at the same place; and NV. 
(V.) baptista White from the Laramie Group at Black Buttes Station, 
Wyoming. 
Shell resembling both Dostia and Velates, suboval in outline, depressed 
convex above, flattened beneath; beak minute, incurved, turned a little 
to one side, and depressed nearly or quite to the posterior margin ; inner 
lip large, flattened or slightly convex, its border smooth or crenulate ; 
outer lip usually a little thickened and sometimes crenulate within, and 
more or less contmuous with the inner lip; aperture comparatively 
small; surface smooth or radiately ribbed; usually polished. It differs 
from Dostia in its more nearly perfect bilateral. symmetry and its minute 
apex; and from Velates in having its apex always depressed to the pos- 
- terior border. ey 3 i 
NERITINA (VELATELEA) BELLATULA Meek. 
Plate 12, figs. 8a and b. 
Neritina (Dostia?) bellatula Meek, 1873, An. Rep. U. 8S. Geol. Sur. Terr. for 1872, p. 497. 
The type which in this article is represented by the two following de- 
scribed forms, while it is closely related to Dostia Gray, and Velates 
Montfort, is doubtless worthy of the subgeneric distinction suggested 
for it by Mr. Meek in connection with his specific description of them 
in the Annual Report of this Survey for 1872, pp. 197 and 198. The pub- 
lication of a diagnosis of the type being necessary for its proper recog- 
nition, and Mr. Meek having failed to publish one, I have drawn the 
foregoing one from the characteristics presented by all the known forms 
which are referable to this type. 
The two forms described in this article were discovered by Mr. Meek 
associated together, and torming a part of the estuary Cretaceous fauna 
at Coalville, Utah, which has already been mentioned. Another species 
of the same type N. (V.) patelliformis is found in the marine Cretaceous 
strata of the same neighborhood, and the only other known species be- 
longing to it was discovered by the writer in the upper strata of the 
Laramie Group at Black Buttes Station, Wyoming. The latter form is 
figured, on plate 29; and XN. (V.) patelliformis, together with a variety of 
the same, is figured on plate 7, accompanying Contributions to Inverte- 
