‘WHITE.] CRETACEOUS FOSSILS. 31 
‘outer border bearing a slender, tongue-like projection, which extends 
outward and forward from the anterior portion of the wing margin. 
Fhe posterior portion of the wing is not accurately known, as all the 
Specimens are more or less imperfect in that respect, but it seems not 
to have been prolonged backward in the form of a pointed projection, 
as it is in Anchura and the typical forms of Lispodesthes. That portion 
of the wing apparently formed a broad, short, blunt projection, which 
was broadly concave beneath, posteriorly ; but there is in our examples 
no appearance of a true posterior canal such as characterizes the typi- 
eal forms of Lispodesthes. Anterior canal comparatively broad and 
long; beak moderately broad, rounded at the anterior end, but with a 
Shorter curve at the left side than at the right. Shell (the callus being 
removed) thin and delicate, its whole surface marked by very fine lines 
of growth, and also by very fine crowded raised revolving “lines, which 
are a little more conspicuous than the former, but they all need a lens 
to render them distinctly visible. There is also a narrow, square shoul- 
dering of the distal border of the volutions of the spire at the suture. 
Length, irom the apex to the end of the anterior canal, 37 millimeters ; 
breadth, across the body volution and wing, 18 milimeters. 
Hig. 7a, plate 11, represents a specimen with the entire callus removed, 
but with the shell proper remaining. Fig. 7 b, of the same plate rep- 
resents an imperfect example with the spire, and a portion of the body 
volution still covered with callus. The indications furnished by the 
other specimens of the collection, all of which are imperfect, are that the 
whole shell, when adult, was covered with callus, as in Dispodesthes 
White and Calyptraphorus Conrad. This shell certainly does not be- 
long to the latter genus, and it also presents some important differences 
‘from the typical forms of Lispodesthes. For example, it has evidently 
‘no posterior canal hollowed out of the callus and extending along the 
spire nearly or quite to the apex, as in the latter genus. This seems to 
be an important difference. A lesser one is the apparent absence of a 
falciform projection of the posterior portion of the wing. It agrees with 
LInispodesthes in general form, in the callus-covering of the whole shell, 
and the anterior tongue-like projection from the wing. I therefore refer 
it provisionally to that genus, notwithstanding the differences before 
mentioned, because no other one of the numerous established genera of 
‘the Aporrhaide will receive it; and because the examples yet known will 
not warrant a full generic diagnosis. For some general remarks on re- 
lated genera, see paragraph following description of the preceding 
species. 
Position and locality—The only specimens yet known, which are cer- 
tainly referable to this species, were collected by Dr. Hayden at ‘‘Dod- 
son’s Ranch, near Pueblo, Colorado”; apparently from strata of the Fox 
Hills Group. <A few imperfect examples found in the Cretaceous strata 
at Bear River City, Southern Wyoming, perhaps belong to this species, 
but they were found only in the condition of casts of the internal cavity. 
Genus TURRITELLA Lamarck. 
TURRITELLA SPIRONEMA Meek. 
Plate 12, fig. 3 a. 
Turritella spironema Meek, 1873, An. Rep. U. S. Geol. Sur. Terr. for 1872, p. 503. 
“Shell rather small, or scarcely attaining a medium size, elongate- 
couival; volutions about fifteen, increasing very gradually in size, mod- 
