green: ENCHODUS in KANSAS MUSEUM. 89 



chus, can not be identified with either the type specimen of that 

 species, which is now before the writer, or with the specimen 

 which Doctor Hay has described and figured as Enchodus doli- 

 chus (Hay, 1903). A comparison of this specimen with the 

 type and the other specimens of this species in the American 

 Museum shows it to be at least four times as large as the pala- 

 tines of that species. While size is not to be depended upon in 

 all cases as a criterion, it seems to be important in this case. 

 Since Enchodus dolichus has the external row of fine teeth on 

 the dentary, and this specimen, No. 86, can not be distinguished 

 from the palatine of another specimen in this museum which 

 does not have the fine fringe of teeth on the external alveolar 

 border of the dentary, it will be classed with the latter. The 

 specimen referred to is No. 817. The dentary of this specimen 

 possesses all of the characteristics that are given for Enchodus 

 dims. Whether it is the same as the type or not will matter 

 little, since a number of species have the same characters as 

 those possessed by the type specimen of Enchodus dirus, and 

 it is hoped that this specimen will have enough definite char- 

 acters to establish the species in a way that will facilitate the 

 work of future systematists, instead of being a hindrance, as is 

 always the case when new species are founded upon insufficient 

 material. This specimen (pi. VI, figs. 3 and 4) differs from 

 that described as Enchodus sievus by Doctor Hay, in not having 

 any ridges on the external surface of the dentary ; only slight 

 traces of tuberculated ridges on the external surface of the 

 articular ; palatine fang laterally compressed and pyrif orm in 

 cross section; the fang has only one cutting edge, which is 

 situated in the median line in front. Other characters are: 

 distinct grooves on the mesio-caudal surface of the fang; a 

 deep groove on the premaxillary, beginning 3 mm. from the 

 alveolar border and as far from the mesial edge, extending 

 caudally, gradually drawing near the median line, so that 

 20 mm. from the cephalic end of the premaxillaries the grooves 

 are only 1 mm. from the mesial edge of the bone. The re- 

 mainder of the external surface is neither ridged nor tuber- 

 culated. The premaxillary teeth are 2 mm. long, very short for 

 a specimen of this size. The premaxillaries are one-half as long 

 as the mandibles. The ethmoid (fig. 3, eth) is composed of 

 two stout beams, which are enlarged and firmly united at the 

 cephalic ends, which, in turn, are flexed abruptly outwards, 

 forming a pair of short processes, the long axis of the cross 



