220 Dr. J. E. Gray on the Skulls of Hares 
Suborder II. DUPLICIDENTATA, Illiger. 
Cutting-teeth $; upper with a deep angular central groove ; 
molars rootless, $+ or 3-3. Skull with the two optic foramina 
united. 
Fam. 1. Lagomyide = Lagomys, F. Cuvier. 
Tail none visible; ears short, rounded; hind legs short ; 
toe-pads naked, small. Skull depressed, expanded behind. 
Maxilla with a large perforation in front of orbit. Grinders 2-2, 
the upper hinder with a small third lamina on the hinder side ; 
the front grinders shelving backwards. 
1. Ocotoma. Skull: the orbits very large; space between the 
orbits narrow ; nose narrow, bent down. 
Ogotoma Pallasii. (Lagomys ogotoma, Cuvier, Waterh. Glir. 
17. Lepus ogotoma, Pallas, Glires, 30, t.3,44.f.16a@.) B.M. 
2. Lacomys. Skull: the orbits large ; space between the orbits 
broad and flat ; nose broad, shelving, nearly in a line with the 
forehead. 
Asia. 
1. Lagomys alpinus, Cuvier, Waterh. Glir. 15, fig. (Lepus 
alpinus, Pallas, Glires, 30, t. 2,t.44.f.13a,6). Siberia. B.M. 
2. Lagomys pusillus, Desm., Waterh. Gl. 19. (Lepus pusillus, 
Pallas, Glires, 30, t. 1,t. 4. f. 4,9). South Siberia; Ural. B.M. 
3. Lagomys rufescens, Gray, Ann. & Mag. Nat. Hist. 1842, 
p. 266; Waterh. Gl. 20. Cabul. B.M. 
4. Lagomys Hodgsoni, Blyth, J. A. 8. B. 1841, x. 816, t. ; 
Waterh. Gl. 23. Ladakh. 
5. Lagomys nepalensis, Hodgson, J. A. S. B. 1841, x. 854, 
t.; Waterh. Gl. 24. Thibet? Nepal. B.M. 
6. Lagomys Roylii, Ogilby, Royle, Himal. t. 4; Waterh. Gl. 
26. Choor Mountains. 
7. Lagomys hyperboreus, Wagner, Waterh. Gl. 36. (Lepus hy- 
perboreus, Pallas.) North-east Siberia. 
America. 
8. Lagomys princeps, Richards. F. B.-A. 227, t. 19; Waterh. 
G1.28; Baird, N. A. M. 619; Aud. N. A. Q. t. 83 (skin). Rocky 
Mountains. 6B.M. | 
9. Lagomys minimus, Lord, P. Z. 8. 1863, p.98. North-west 
coast of America. B.M. 
Fam. 2. Leporide, J. Gray (Lilljeb. 59). 
Ears large, elongate, often longer than the head. Tail © 
short, bushy; the hind legs much longer than the fore legs, 
