Co^ie.] -cv4: [March 4, 



Lines. 



Length of eight teeth over convexity 41 



' ' of stoutest tooth . . . , 6.3 



Depth of vasodentine of do 7 



Width of same tooth (over convexity) 28 



Laminar face obtusely angulate on the median line below. 



This species is thick-toothed as in M. pachyodon and M. holmesii, but 

 they are not so clearly three-ribbed in section as this one. The M. rugosus 

 is somewhat similar, but is much wider, with more curvature of teeth 

 and double row of laterals. 



From the marl, pits of the Freehold and Squankum Company, in the 

 Eocene bed at Farmingdale, Monmouth Co. N. J. 



MYLIOBATIS KECTIDENS, Cope. 



Represented by seven consecutive teeth extending from the concave trit- 

 nrating surface, to the end of the series. There are two lateral series of 

 teeth on each side, of which several of those of the inner series at least are 

 wider than long. Those of the median series are entirely plane, and with 

 perfectly straight transverse sutures. The series is very slightly convex in 

 both directions. 



Lines 



Length of seven teeth 38 



Width of each median tooth 15 



Dex)th of vasodentinal layer 4 



This species is to be compared with the M. vicomicanus m. In it there 

 are twice as many (12) teeth in a series of the same length and width as 

 the present ; the median series are recurved at the extremities ; in this 

 one straight. 



This species is from Harrisonville, N. J., from marl excavations which 

 are chiefly in the upper bed of Cretaceous green sand. The rusty color of 

 the specimen indicates that it came from the upper part of the excavation, 

 and therefore probably from a miocene stratum which Prof. Cook shows 

 frequently overlies the green sand proper. 



COELOEHYNCHUS, Ag. 



COELORHYNCHUS ACUS, Cope. 



Established on a portion of the muzzle of a fish similar in some re- 

 spects to the C. rectus, Ag., but smaller than it and much less than the 

 C. ornatus, Leidy, from the same locality. The fragment presents a single 

 median cavity, and externally nineteen ridges separated by narrow grooves ; 

 in the C. ornatus there are from thirty to forty in the same portion of the 

 length. Diameter 1.3 lines. From the Eocene Marl of Farmingdale, 

 Monmouth Co. i^. J. I am indebted to A. J. Smith, Superintendent of the 

 pits, for this and other valuable specimens. 



