1915.] Matthew and Granger, Lower Eocene Wasatch and Wind River Faunas.. 470 
Metatype of Pelycodus angulatus, No. 4184, lower jaw with ps-m,: and alveoli of 
p3;and ms, from Bighorn basin. 
Distinctive characters: Ps-m3; = 15 mm.; ps somewhat narrower than in C. 
scoitianus, more oval, heel cusps less separate, ms relatively smaller. 
Twelve or more jaws from the Lysite horizon in the Bighorn basin and 
two from the corresponding level in the Wind River basin are definitely 
referable to this species, others more fragmentary probably belong to it. 
Fig. 46. Cynodontomys ?latidens, lower jaw, inner, outer and crown views, enlarged 
three diameters. Outline of jaw, natural size. Upper Gray Bull beds, Bighorn basin, Wyo- 
ming. 
One jaw, No. 14695, has all the teeth except the tips of pz and i in perfect 
preservation, affording a good comparison with the jaw of C. scottanus trom 
a higher horizon. ‘Two lower jaws from high up in the Gray Buil beds are 
