COEYPHODON. 537 



CORYPHODON ANAX Cope. 

 Plate XLIVe, fig. 6; XLVIIIa. 



Mr. Wortman sends m^ a number of teeth of probably two individuals, 

 wliicb exceed in size those of any species of Coryphodon yet known, and 

 differ in certain details of form from all of them. The specimens consist 

 of incisors, premolars, and molars of both jaws of One animal, and an 

 inferior canine, which from its separate wrapping, I suppose to have been 

 derived from a different locality. 



The incisors and premolars have the form usual in species of the genus, 

 differing only in their large size. A well-preserved superior true molar is 

 probably the third. It has the form usual in the genus, but exhibits two 

 peculiarities. The posterior transverse crest is divided more deeply ^than 

 usual by a deep notch which enters it from the transverse valley. The 

 external portion is the shorter, and exhibits the peculiarity of being con- 

 nected with the external part of the anterior transverse crest. It is as closely 

 connected with this crest as it is with the internal portion of the posterior 

 crest. The external connection does not exist in the other species of the 

 genus, where the two crests are separated at their outer extremities by a 

 deep valley. The posterior basal cingulum is obsolete, while the anterior 

 is well developed. The enamel of this tooth, where not worn, is wrinkled. 



The posterior part of the last inferior molar is characteristic. The 

 posterior transverse crest is short and very oblique, its inner extremity 

 striking the posterior margin near the middle. Here it is elevated into a 

 cusp, which rises above the surrounding parts in a characteristic manner. 

 There is no ledge round its posterior base, but the border expands outwards 

 at the base of the true crest. The additional inner marginal tubercle is 

 low and compressed, as in C. lobatus. A second inferior true molar is nor- 

 mal, with well -developed anterior marginal ridge. The inferior canine 

 mentioned is of large proportions, exceeding by one-half, the dimensions 

 of the inferior canine of C. lobatus. Its crown is curved outwai'ds, and has 

 a basal alate expansion of its internal ridge. 



Measurements : Diameters of last superior molar, anteroposterior, .039 M. ; 

 transverse, .051 M. Diameters of second inferior true molar, anteroposterior, 

 .039 M.; transverse, .028 M. Length of inferior canine, .160 M. Length 

 of crown of canine, .090 M. Diameters of base of crown of canine, ver- 

 tical, .037 M.; transverse, .036 M. 



This species is nearest the C. lobatus in some respects. The short 

 posterior crest of the last inferior molar, with its cusp-like extremity, and 

 the absence of posterior ledge on this tooth, will readily distinguish it. 



