SYNOPSIS OP THE VEKTEBRATE FAUNA OP THE PUERCO SERIES. 341 



The femur of the second specimen is nearly perfect. Tlie trochanters are well 

 developed ; the great extending proximad to the head, and connected by a curved 

 ridge with the less. Third trochanter superior in position, its superior i)art overlap- 

 ping the line of the inflMior part of the lesser. Head without fossa or notch lifia- 

 menti ten's. liotular face elevated, wide, with equal l^oiders and sliirht concavity. 

 Condyles well separated. 



Measurements of JVo. S. M. 



Length of inferior molar series 043 



•• " " true molars 0205 



" " " " m. iii '. 007 



Depth of ramus at m. i 015 



p. m. iv 009 



Length of femur (greatest) 098 



Width at head 022 



" " middle of shaft (crushed) Oil 



" " condyles 017 



CHRIACCS 8TENOP8 Sp. nOV. 



Four mandibular rami of three individuals represent this species. Two of the 

 laiiii arc entire to the base of the canine tooth. These show interspaces between the 

 second and third and third and fourth premolars, not seen in such s]iecies as <'. pelvi- 

 dens and C. ,scJilof;seri(iiiUf!. It resembles in this respect the (J. haldw/'iti, but diU'crs 

 from it in characters already mentioned, and in its superior size. The internal cusp 

 of the first inferior premohir is also much better developed. 



The antei'ior cusps of the true molars ai-e more elevated than the posterior, but 

 the diirerence is not so great as in some other species. The fifth is a prominent 

 angle, nearly in line with the fourth, and connected with it by a crest. 'I'he iieel has 

 an external angular cusp with crescentic section, well distinguished from an internal 

 curved border which is connected with a small median posterior angle. This be- 

 comes a prominent cusp in the third molar, which is of average size. Molars with an 

 external eingulum. Enamel coarsely and obsoletely rugose in unused specimens. Tiic 

 first premolar has a well-developed ti'ansverse heel, and anterioi' l)asal cusp. The 

 second has the same, but of i-educed proportions. 



In a specimen (No. 3) cleaned by weathering, the posterior border of the sym- 

 physis is opposite the posterior border of the p. m. iii ; the two mental foramina are 

 below p. m. ii, and the space between p. m. iii and iv. 



Measurements No. 1. M. 



Length of dental series including canine 055 



" molar series Oil) 



" " true molar series 024 



