Seni Re LARAMIE FOSSILS 91 
GONIOBASIS CLEBURNI White. 
Plate 30, figs. 4 a, b, c, and d. 
Turbonilla (Chemnitzia) melanopsis White, 1875 (not Conrad), Expl. and Sur. West of 
the 100th Merid., vol. iv, p. 197, pl. xviii, fig. 10 a. 
Goniobasis cleburni White, 1876, Powell’s Rep. Geol. Uinta Mts., p. 122. 
Shell rather large, gradually tapering from the last volution to the apex, 
the sides of the spire being only slightly convex; volutionsapparently nine 
or ten, gradually increasing in size, the last one not being proportionally 
larger than the others ; suture slightly impressed; sides of the volutions 
of the spire nearly flat, or only slightly convex, but the outer and anterior 
sides of the last one having a broad and regular convexity; aperture, as 
indicated by the lines of growth, subovate in outline; outer lip broadly 
sinuate. Surface of the spire marked by numerous strong longitudinal 
ridges or varices, extending from suture to suture, which are slightly 
flexed and slightly oblique to the axis of the shell, or approximately 
parallel with it; the proximal side of the last volution marked by sev- 
eral faint revolving lines, the longitudinal varices of the last volution 
ending before reaching that portion of the surface do not appear there. 
The lines of growth are usually stronger upon the last volution than 
elsewhere, and the varices are sometimes obsolete, at least upon a por- 
tion of its surface. Revolving lines have not been observed upon the 
surface of the spire, but sometimes the edges of the longitudinal varices 
are seen to be faintly crenulate, as if by incipient revolving lines. 
Although a considerabie number of specimens have been collected, 
none have been found with the apex complete, but the length of a full- 
grown specimen is estimated from those obtained at about 50 millime- 
ters ; diameter of the last volution, 19 millimeters. : 
‘IT now think that the shell, which in vol. iv, Expl. and Sur. West of the 
100th Mezid., p. 197 pl. xviii, fig 10 a, I doubtfully referred to Turbo- 
milla (Chemnitzia) melanopsis Conrad, and which was obtained from South- 
western Utah, really belongs to this species. ‘This opinion is supported 
by the fact that Corbicula ( Veloritina) durkeei Meek, was reported from 
the same locality, and which is also figured in the volume quoted; plate 
xxi. This being the fact, the geographical range of G. cleburni is seen 
to be very great. 
Position and locality.—The types of this species were obtained from 
the Bear River Laramie series, near the mouth of Sulphur Creek, Bear 
River Valley, Wyoming. Examples of it, more or less perfect, have 
been found at all, or nearly all, the localities at which the Bear River 
Laramie series has been recognized. It is, therefore, one of the more 
characteristic species of that series of strata. 
GONIOBASIS CHRYSALLIS Meek. 
Plate 30, figs. 6 a and b. 
Goniobasis chrysallis Meek, 1871, An. Rep. U. S. Geol. Sur. Terr. for 1870, p. 316. 
The following is Mr. Meek’s original description of this species: 
“Shell generally almost cylindrical below the middle, but more ab- 
ruptly tapering above; volutions six or seven, flattened, with the upper 
margin thickened, last one not angular, and scarcely larger than the 
next above it; suture well defined. 
“Surface ornamented by distinct vertical costs, often ranged nearly 
in the same line all the way up the spire; these are partly interrupted 
