GREEN: ENCHODUS IN KANSAS MUSEUM. 95 



to be expanded," is easily explained by the fact that only the 

 external surface of the type was exposed, and the bases of the 

 teeth of the dentary can not well be observed from the ex- 

 ternal view, because the outer marp:in of the alveolar border 

 is elevated, forming a thin lamina of bone. (See pi. X, fig. 3, 

 den). The cephalo-dorsal processes over the bases of the 

 fangs are at unequal distances from the bases of the fangs, 

 and the process on the left palatine is considerably larger. 

 The process over the left fang is four millimeters from the 

 base, and that of the right palatine is five. The larger size 

 of the process on the left palatine may be due to the absorp- 

 tion of the osteodentine of the cephalic end, between the 

 process and the base of the fang, preparatory to the depo- 

 sition of osteodentine that is to form the base of a new fang. 

 This explanation is suggested by the appearance of a median 

 section of a larger species, possessing a similar process over 

 the base of the fang (pi. VII, fig. 17). The grooves on the 

 mesio-dorsal surface of these palatines for the reception of 

 the lateral processes of the ethmoid are somewhat larger and 

 longer than in the cotype. The figure represents the palatines 

 relatively more slender also, but this is due to the position 

 they occupy and to some extent to compression. 

 Measurements : 



iii[n. 



Depth of the palatine at the middle of the dorsal fossa for the articu- 

 lation of the ethmoid 9 



Width at the same place 7 



Other fragmentary specimens of this species in the collec- 

 tion are: No. 813, two dentaries; No. 55, two dentaries and 

 one articular; No. 53, portions of toothed elem.ents, probably 

 dentaries; No. 811, an articular and dentary. 



Eiielioclus dolichus Cope. 

 This specimen is represented in the collection by thirteen 

 specimens, figured in this paper, and one pair of dentaries. 

 No. 815, not figured. It is distinguished from the petrosus 

 group by the presence of the fringe of minute teeth on the ex- 

 ternal alveolar border of the dentary, and from Enchodns 

 shumardi by its much larger size, opaque bones, and the teeth 

 relatively less slender. After a careful comparison of all of 

 these specimens with the type specimen of Enchodns dolichus 

 Cope, No. 1820, and with the specimen of Enchodns dolichus, 



