Cope.] loO [Aug. 17, 



of a boot with the toe elevated. The inferior edge of the inferior process 

 is acute. 



The inferior border of the ramus is thin. The superior border is thick- 

 ened, and its tooth bearing surface descends on both the internal and ex- 

 ternal faces of the bone. Posteriorly, this face is presented inwards, but 

 this tooth-band narrows forwards on this side, and widens on the external 

 face. Its greatest width on the latter is posteriorly, an inch in front of the 

 widest internal exposure ; it then gradually contracts, its inferior border 

 rising to a short distance behind the symphysis. 



The dental alveoli are small and round, densely packed, and sub-equal 

 in size. Near the middle of the ramus, thirty longitudinal rows may be 

 counted. Not a tooth remains. A transverse section of the greater part of 

 the length of the dentary is strongly convex ; anteriorly it is flat- 

 tened above. 



Measurements. M. 



Length of ramus 834 



" " tooth band - 150 



Depth of symphysis 016 



" at posterior end of tooth band 050 



" at glenoid cavity 019 



'• at angle 030 



Stkatodus oxypogon Cope. 



This fish is represented in Mr. Sternberg's collection by a dentary bone, 

 a probable maxillary, and a portion of the palatine, both the latter without 

 their extremities. A number of vertebrae accompany the jaws, which prob- 

 ably belong to the same individual. 



The dentary is narrow and cuneiform, and rather robust for its depth. 

 The tooth band is wide, covering more than half the vertical diameter of 

 the bone, and is bounded below by a groove. The external face is convex. 

 A delicate groove extends along the superior margin just below it ; and a 

 wide open groove commences behind the middle of the length and ahove 

 the middle of the vertical diameter, opening widely behind. The inferior 

 edge is compressed and flat, and is abruptly distinguished from the convex 

 portion. The symphyseal surface is short, and the infero-anterior border is 

 produced into an acute angle. The teeth are in six rows on the widest part 

 of the band. Of these one contains larger teeth than the others ; at one 

 point it is the second from the external margin, but its position becomes 

 more interior on the anterior part of the band. The teeth are recurved, 

 round in section, and with simple, very acute apices. These are transpa- 

 rent and vitreous ; the remaining portion of the tooth is opaque, and marked 

 with whitish dots. At the anterior extremity of the dentary, but two rows 

 of the smaller sized teeth remain. 



The alveolar fossae of the teeth of the three interior series of the dentary 

 band, have a peculiar character. The internal half of the border has short 

 radiating lines touching its circumference, but the external half' supports 



