WHITE. | CRETACEOUS FOSSILS. 29 
outer lip thick, very obscurely crenate within, and apparently continu- 
ous with the margins of the inner one around behind;. aperture trans- 
versely semicircular, and less than half the size of the under side of the 
shell. Surface ornamented by about fifteen simple, narrow, sharp, and 
subcrenate radiating cost, separated by wider, rounded intermediate 
furrows; lines of growth distinct. 
‘Length about 0.87 inch; breadth, 0.70 inch; convexity, 0.35 inch. 
“This is another curious form allied to the little species I have described 
under the name WN. bellatula. When viewed from the dorsal side, as 
seen lying with the aperture downward, its form and strong radiating 
cost give it much the appearance of the left valve of a Cardita or Car- 
dium. The only specimen of it in the collection has its apex and pos- 
terior and lateral margins broken away, and its broad, smooth, shelf-like 
inner lips broken by pressure inward. Still, however, it gives a tolera- 
bly correct idea of the characters of the shell. In several respects it 
agrees with Velates, and possibly might without impropriety be called 
Velates carditoides. . I suspect, however, that when better specimens can 
be examined it will be found tpyical of an undescribed section, including 
also the little species N. bellatula. Ifso, I would propose for the group 
the name Velatella. I know of no nearly allied type. 
“ Locality and position.—Carleton’s coal-mine, Coalville, Utah. Cre- 
taceous.” 
Genus EUSPIRA Agassiz. 
KUSPIRA UTAHENSIS White. 
This species was erroneously mentioned and described in the An. 
Rep. U.S. Geol. Sur. Terr. for 1877, under the name of H. coalvillensis. 
(See pages 237, 253, and 310; and also explanation of plate 4 of that 
volume. . 
Genus TESSAROLAX Gabb. 
TESSAROLAX HITZII (sp. nov.) 
Plate 15, fig. 2a. 
Shell rather small; length of the spire about one-half that of the 
whole body of the shell exclusive of the canals; its apex a little blunted ; 
volutions about five, that of the body bearing two revolving angles or 
narrow ridges which apparently end respectively upon the two slender 
spines of the outer lip; the whole spire covered with:a layer of callus 
which obscures the sutures, and also the original surface of the volu- 
tions upon which there are apparently some revolving lines; outer lip 
bearing two long slender spines projecting from its border, each being 
grooved upon its under surface; the anterior labial spine directed out- 
ward and forward, and having near its middle a moderate enlargement, 
where it is also bent a little downward; the posterior labial spine grad- 
ually and uniformly tapering from base to point, directed outward and 
slightly curved backward; anterior canal long slender and spine like, 
flexed a little downward and to the left, its grooves being very narrow 
and linear; posterior canal also. slender, its grooves being narrew and 
linear like that of the canal and the labial spines, extending from the 
aperture close alongside of the spire and projecting as a slender spine 
much beyond its apex, from which it gently curves to the right; the 
