104 KANSAS UNIVERSITY SCIENCE BULLETIN. 



caudal to the fang. The row of minute teeth is continuous 

 past the fang. 

 Measurements : 



mm. 



Length of the mandible 57 



Leng-th of the dentary fang 9 



Length of the four other large teeth 4.5 



Depth at the caudal end of mandible 12 



The following table gives the comparative lengths of the 

 palatine fangs of several of the specimens of Enchodiis doli- 

 chus. Although the ratio of the lengths of the fangs to the 

 other measurements varies, the variation is within narrow 

 limits, so that the sizes of the specimens are nearly propor- 

 tional to the lengths of the fangs. 



No. 831, plate XIV, figure 1 7 



No. 832, plate XV, figure 12 8 



No. 821, plate XIV, figure 2 10 



No. 827, plate XV, figure 11 10 



No. 174, plate XII, figure 2 12 



No. 810, plate XIII, figure 2 16 



No. 808, plate XIII, figure 1 23 



No. 814, plate XI, figures 1, 2, and 3, (estimated) 23 



Eiichodus shiiinardi Le dy. 



Evchodns shumardi, the smallest species of the genus, is 

 represented in the collection by thirteen specimens. The best 

 of these is the skull shown in plate XV, figure 1, specimen No. 

 829. This specimen shows the shape of the head, the protrud- 

 ing mandible, and several other characters heretofore un- 

 known. The premaxillary, ceratohyal, branchiostegal rays, 

 and ethmoid do not lie in position. The ethmoid lies four 

 millimeters directly above the deep groove, on the dorsal side 

 of the palatine, in which it articulates. Only a slender portion 

 of the margin of the left frontal remams to connect the 

 ethmoid with the caudal elements of the skull. The premaxil- 

 lary is reversed. 



The palatine in only three-fourths as long as the palatine 

 fang. The pterygoid in this specimen has no teeth. It is 

 very probable that the tooth border has been broken off of 

 this bone, but this can not be determined. The bones are very 

 delicate, and excepting such parts as the palatine, alveolar 

 borders, and points of articulation, are as thin as paper. The 

 ventral border of the dentary is extended into a thin plate, 

 the cephalic end of which is just under the palatine fang. 



