green: ENCHODUS in KANSAS MUSEUM. 87 



rosus type, it is thought best to figure it as a small specimen of 

 E. petrosus. The principal measurements are as follows : 



mm. 



Length of vertebral column 550 



Width of skull at the sphenoties 75 



Width of the caudal end of the skull 55 



From the caudal end of the angular to the p:ilatine fang 180 



From same point to top of hyomandibulav 130 



Depth of caudal end of mandible 45 



Length of the palatine fang (estimated) 30 



Cephalo-caudal diameter of the palatine fang at the middle point ... 5 



Length of the post-temporal 47 



Length of the centra 15 



These measurements indicate that the fish was comparatively 

 short bodied, with a large triangular head. If the pectoral 

 fins of this species have the same proportional length as those 

 of Enchodus dolichus (pi. XI) , they are one-half as long as the 

 body. 



The caudal fin of this species, represented by another speci- 

 men (No. 806, pi. VI, fig. 1), has nearly equal rami. They are 

 comparatively slender and composed of rays which are solid 

 near the proximal ends, but the remainder is segmented, and 

 finely divided distally. The most anterior rays are short, un- 

 segmented bars. These gradually increase in length until 

 about the eighth ray, when they become segmented distally. 

 After the twelfth they elongate rapidly, and the fourteenth is 

 large and heavy, forming a large part of the cephalic border 

 of the rami. The rays which attach to the caudal margin of 

 the hypural are very small and about one and one-half times as 

 long as the hypural. The following measurements were taken : 



mm. 



Length of the dorsal ramus 130 



Length of the hypural 15 



Enchodus sp. 



Figures 3, 4, and 5, plate II, represent a fragmentary speci- 

 men which may prove to be^a new species. It is No. 805. It is 

 larger than any of the other American species yet described. 

 The specimen consists of a portion of an opercular, a nearly 

 complete supraclavicle, the caudal end of a dentary, and some 

 very small fragments of the articular. The opercular was cov- 

 ered externally with radiating tuberculate ridges. The caudal 

 portion of this bone is broken away, but the impression (m) 

 left in the chalk shows distinctlv the ornamentation of the ex- 



