126 F. B. Loomis — Wasatch and Wind River Rodents. 



large interior basin. There is the beginning of a ridge inward 

 from the protocone. The incisors are much compressed, 

 measuring on the broken section 5-| mm deep by 2f mra wide. 

 The series of four lower molariform teeth occupy 15 mm . 



B 



Fig. 1. Paramys primaevus, x4; A, upper series of the right side; B f 

 lower premolar 4 and molar 1 of the left side ; ai, anterior intermediate 

 or paraconule ; c, anterior marginal ridge ; h, hypocone ; hd, hypoconid ; 

 m, metacone ; md, metaconid ; ms, mesostyle ; msd, mesostylid ; p, proto- 

 cone ; pa, paracone ; pad, paraconid ; pd, pi'otoconid ; ps, parastyle ; pi, 

 posterior intermediate or metaconule. 



Paramys quadratics sp. nov. 



Type No. 226a, a lower jaw of the right side, with three 

 teeth (molar 1 lacking), found in Buifalo Basin near Meeteetse, 

 Wyo. 



The jaw is the largest of those known from the Wasatch, 



Fig. 2. Paramys quadratics, x 4 ; lower jaw of the right side. 



the lower teeth being distinguished by being nearly as wide as 

 they are long, the cusps being plump and marginal, the interior 

 basin being very large and fairly deep. Premolar 4 has the 



