GREEN : ENCHODUS IN KANSAS MUSEUM. 99 



the foramen, on the somewhat, thickened edge, is a facet for 

 the articulation of the first large pectoral ray. The cephalic 

 edge unites firmly to the mesocoracoid and the clavicle. A 

 prominent ridge begins just dorsad to the foramen and pro- 

 ceeds nearly cephalad across the suture between the hyper- 

 coracoid and the mesocoracoid, and, gradually diminishing, 

 disappears at the cephalic edge of the mesocoracoid. The 

 cephalic end of this ridge is as near to the median line as is the 

 mesial edge of the large oval foramen of the hypercoracoid. 

 The mesocoracoid (mc) is a much smaller bone, which joins 

 the hypercoracoid on the cephalic edge, and its dorsal edge is 

 firmly united to the clavicle along the line of the ridge men- 

 tioned above. The ventral edge is free. The hypocoracoids are 

 both slightly broken at both ends. A more complete one is 

 shown in plate XIII, figure 1, hco. The figure of the specimen 

 under discussion shows, by means of broken lines, the outlines 

 of these bones, as determined by their impression in the matrix. 

 The ventral margins of these elements are flexed abruptly 

 outward and then inward, which gives them the appearance of 

 having a groove along the mesial edges. These edges are ex- 

 tended cephalad, ending in narrow points near the median 

 line. The caudal ends are broad, rounded, and directed slightly 

 away from the median line. The middle portion of each hypo- 

 coracoid is raised, forming a very flat cone with a rounded 

 apex. Two-thirds of the distance from the apex to the cephalic 

 border in each bone is an oval foramen whose diameter is 

 equal to one-third of the diameter of the foramen in the hyper- 

 coracoid. Three actinosts are present. These articulate with 

 the margin of the hypocoracoid just caudad to the hyper- 

 coracoid. The fin rays are finely divided distally and are 

 wholly unsegmented. 



The measurements of this specimen are : 



Length of skull 150 



Width of skull across sphenotics 70 



Width of skull across pterotics .- 60 



Length of the mandible 145 



Length of the minute teeth of the dentary 2 



Length of the premaxillary teeth 4 



Caudo-cephalic measurement of the opercular 92 



Estimated length of the clavicle 90 



Length of the hypocoracoid 90 



Length of the hypercoracoid 30 



Width of a pectoi'al fin at the middle 80 



