102 GEOLOGICAL SURVEY OF THE TERRITORIES. 
CAMPELOMA MACROSPIRA Meek. 
Plate 30, fig. 2 a. 
Mr. Meek describes this species in vol. iv, U.S. Geol. Sur. 40th Paral- 
lel (King), p. 179, and gives imperfect figures of it on plate xvii of that 
volume. It was originally described by Meek in the annual report of 
this survey for 1872, and fig. 2 a, plate 24, is drawn from the type 
from which he drew that description. Some other examples, collected 
from the same locality which furnished the types, indicate a much larger 
size than even the figure on plate 24. It has been found only in the 
Bear River series of Bear River Valley, Southwestern Wyoming. 
Genus VALVATA Miiller. 
VALVATA SUBUMBILICATA Meek & Hayden. 
VALVATA PARVULA M. and H. 
Dr. Hayden’s collections from the Fort Union series of the Laramie 
Group in the Upper Missouri River region contain the types of both these 
forms. They are described in vol. ix, U.S. Geol. Sur. Terr. (4to ser.), 
pages 290 and 291, respectively. The former is figured on plate 43, but 
the latter is not illustrated. Mr. Meek expressed the belief that it is 
only a variety of the first. 
VALVATA? MONTANAENSIS Meek. 
Mr. Meek describes this form from the Judith River series, Upper 
Missouri River region, in vol. ix, U.S. Geol. Sur. Terr. (4to ser.), p. 591, 
and gives three wood-cuts of it in connection with the description. It 
has not been discovered elsewhere in any part of the Laramie Group. 
Genus ODONTOBASIS Meek. 
ODONTOBASIS BUCCINOIDES White. 
Plate 20, figs. 3a and b. 
Odontobasis buccinoides White, 1376, Powell’s Rep. Geol. Uinta Mts., p. 124. 
Shell of medium size, somewhat robust; volutions six or seven, regu- 
larly convex; suture faintly impressed; surface marked by somewhat 
' strong longitudinal folds or varices which end at the suture upon the 
proximal side of the volutions of the spire, but do not quite reach the 
suture upon the distal side, and upon the last volution they become ob- 
solete before reaching the anterior end of the shell; the whole surface 
is also marked by somewhat coarse revolving raised lines, which, in 
crossing the longitudinal varices, give them a crenulated appearance. 
The revolving lines which traverse a narrow space upon the proximal 
side of the suture, and also the space in front of the revolving furrow of 
the columella, are finer than the others. Odontoid process of the base 
not very prominent, forming a small angular projection at the end of the 
revolving furrow of the columella. 
Length, 37 millimeters ; diameter of the last volution, 22 millimeters ; 
but these proportions vary considerably in different examples, as is 
shown by the two figures on plate 20. 
