MOLLUSCA. 
23 
sixtli; all moderately convex and somewhat inflated, the 
upper one of the spire least so. The suture is not appressed 
in any of the whorls. Each lower whorl is crossed by an 
obtuse varix in the direction of the lines of growth, which 
are rather oblique, very slightly sinuous, and very obscurely 
marked by a few concentric striae, which do not disturb the 
general smooth contour. 
The whorls increase slowly, each being about half as broad 
again as the preceding. The base is short, regularly convex, 
and the lines of growth distinct on it. Umbilicus small, so 
far as can be seen. 
The varicose whorls give the shell a character that recalls 
many a more modern genus. As I have not observed this in 
any of the Silurian ILolopecc, it may render the genus a little 
doubtful. 
Locality .—Chorhoti Pass, 16,000 feet. (No. 1754.) 
HOLOPEA PUMILA. 
Plate 2, fig. 18. 
H. depresso-turbinata, lsevis, anfractibus 5 planatis suturisque 
in lentatis, varicibus nullis. Basis subplana, umbilico magno angulari. 
Diam. iunc. 
Similar to the last, but with flatter whorls above and more 
decidedly angular below. The base is very nearly flat, or 
gently sloping to a broad angular umbilicus, and the whorls 
(three or four in number) are obliquely flattened above, indent¬ 
ed at the suture, and crossed by somewhat conspicuous close- 
set lines of growth. 
Our figure represents the fossil as rather too much depressed. 
It is a small species, barely more than a quarter of an inch 
in diameter. 
Locality. —Damchen, 16,000 feet. (No. 1678.) 
PATELLA ? 
* Plate 2, fig. 19. 
The genus is very uncertain; it is an obliquely ovate cast of 
the interior. One of the sides is straight, the umbo very 
