223 



Measurements. 



M. 



Total length of tlio inandibiilar ramns 0.867 



Total loiiBtli of tho tootli-lino 0.170 



Transverse diaiiicter of the symphysiB 0. OIH 



Transverse diaiiietur of tlic base of a tooth 0.004 



Length of the preniaxillary 0. OCH 



Length of the preniaxillary to tho large tooth 0.010 



Greatest depth of the preniaxillary 0. Ol'.l 



Diameter of tho Large tootli at the base 0.007 



Length of the maxillary to the ilr.st tooth 0. 171 



Depth of the maxillary at the (list tooth 0.019 



Depth of the maxillary at the la-st tooth 0.014 



Depth at the artieiilar ^urface 0.0245 



Found hy tlic writer near Fossil Spring, near Fort Wallace, in Western 

 Kansas. 



Pachyrhizodus KiNGii, Cope. 



KstaUlislieil on tlio proximtil portion of a maxillary I)oiie with tlie articular 

 surtiicc and bases of twelve teeth. It is a species of nearly the same size as 

 the last; l)ut the hone contracts more rapidly than in that one, and presents 

 a stronger interior longiliidinal ridge. The superior articular face is smaller 

 and narrower, being subeiescentic, while the insertion-likt- tuberosity is nearer, 

 and on the inner edge of the outer face, and connected with the articular face 

 by a ridge, and not separated by a groove, as in P caninus. The outer face is 

 depressed below the articular face much more than in that species, so that 

 its lower portion becomes more convex. The roots of the teeth are of the 

 same length as in P. caninus, and, as they are more numerous, they are more 

 closely packed and more cylindric. Their pleurodont character is also more 

 strongly marked. The superior surface of the bone is striate-groovetl longi- 

 tudinally, not transversely nor obliquely. Total depth of bone ;it superior 

 articular face, 0"'.022 ; depth at tenth tooth, O^.Ol 55. 



This species was found near the preceding. It is dedicated to I>r. 

 William Howard King, post-surgeon at Fort Wallace, to whom, and not less 

 to his excellent wife, I am indebted for hospitality and other assistance of a 

 kind essential to the success of my explorations in Western Kansas. 



Pachyrhizodus latimentum, Cope. 



Represented by both mandibular rami and numerous lateral cranial bones 

 of a specimen from the Solomon River, and a portion of a mandible from tiie 

 Smoky Hill, Kansas. Tiie rami are relatively deeper than those of /■*. caninus; 



