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, S. 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 distinct 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. 



Hah. New Mexico (Webster). 



LII. — Descriptions of two new Fossil Cow7-ies characteristic of 

 Tertiary beds near Melbourne. By Frederick M'Coy, Prof, 

 of Nat. Science in Melbourne University, and Government 

 Palseontologist for Victoria. 



Cypreea (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 ] inch long to twenty- 

 three at 4 lines long, very rarely dichotomizing irregularly or 

 stopping short, more often turning abruptly out of then- 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 



