436 Prof. F. M‘Coy on two new Fossil Cowries 
These three may be varieties of the same species. There are 
two or three specimens of each species in the Museum, and they 
appear very distinct. 
B. Tail shorter than the body; back with five dark streaks, the 
side ones far from the vertebral, and edging a pale lateral 
streak ; face-streak indistinct, white. 
Tamias americanus, Kuhl. 
Tamias striatus, 8. Baird, M. N. A. 293. 
Sciurus striatus, L. 
Sc. striatus americanus, Gmelin. 
Tamias Lysteri, Richardson. 
Eye with a white streak above and below. 
Hab. Canada, United States of North America, New York, 
Washington, Western Missouri... B.M. 
C. Tail shorter than the body, bushy; back with a distinet dorsal 
streak and an indistinct lateral one on each side. 
Tamias dorsalis, Baird, Proc. A. N.S. Philad. 1855, vii. 332 ; 
Mam. N. A. 300. 
Hab. New Mexico (Webster). 
LII.—Descriptions of two new Fossil Cowries characteristic of 
Tertiary beds near Melbourne. By Frepericx M‘Coy, Prof. 
of Nat. Science in Melbourne University, and Government 
Paleontologist for Victoria. 
Cyprea (Trivia) avellanoides (M‘Coy). 
Sp. Ch. Very thin, ovato-globose, transverse sections nearly 
three-quarters of a circle from the outer lip, the remainder of 
the inner lip curving more rapidly, obtusely rounded behind, 
slightly tapering in front to the short, scarcely notched canal ; 
aperture narrow, of nearly equal width throughout (about seven 
times as long as wide), the outer and inner lips nearly parallel, 
terminating in a very short, straight channel in front, but 
abruptly curved to the right, with the thickened outer lip be- 
hind; spire not prominent, of three turns and a half; surface 
crossed by very narrow, sharply defined, very prominent, thread- 
like ridges, varying from thirty-five at 1] inch long to twenty- 
three at 4 lines long, very rarely dichotomizing irregularly or 
stopping short, more often turning abruptly out of their course 
with a branch-like bend to one side, so as to intercalate short 
ridges, between a longer pair, separated by sharply defined, ° 
broad, flat spaces usually three or four times as wide as the 
