Cope.] ^ '* [Jiin. 7. 1870. 



The following are the proportions of the smaller individual, from L. T. 

 Germain: 



In. Lines. 



Length of centrnm cervical (with hall) 34 



Depth hall of same 18.5 



Width " " 21 



Length anterior dorsal 84 



Width cup 24 



Proximal wddth outer face quadratum 28 



Length quadratum to lower edge pit 20 



" opisthotic (see description) 3 4 



" outer margin do 3 4 



This was a large and powerful reptile, and prohably more elongate in 

 proportion to its hulk than the Mosasaurus, well deserving the name 

 jfacrosaurtis, which Owen has applied to an ally. 



From the upper Greensand Bed of the New Jersey Cretaceous. 



Thecachampsa, Gope. 

 The species of this genus have long simple hypapophyses. In "Synop- 

 sis Extinct Batrachia and Reptilia N. A.," p. 63, the question as to the 

 presence or absence of truncate or split hyiiapophyses as in Holops, etc., 

 was left undecided. 



Taphkosphts molops, Cope. 

 In a specimen of this species which I found in place in the bottom of 

 the green sand bed at Hornerstown, N. J., the lateral intersternal bones 

 were distinctly seen in place. They present a rounded interior out- 

 line, and apply to an equal extent of the hyo- and hyposternal 

 bones. They extend but one-third the distance to the median longitudinal 

 suture, and are much as in the existing genus Podocnemis. The speci- 

 men observed measures 10.5 inches in width between the inguinal notches. 

 TAPniiosATjKus, Cope. 

 Suborder Streptosauria. Neiu-al arch not coossified with the centrum, 

 each neurapophysis attached in a rounded pit of the body. 



This genus is proposed for the Plesiosaurus lockwoodii, Cope, Trans. 

 Amer. Phil. Soc, 1869, 40. Were it a true Sauropterygian, I would con- 

 tinue to regard it as a Plesiosaurus, but it is, I have little doubt, one of 

 the same type as Cimoliasaurus, which it resembles, except in the pecu- 

 liar attachment of the neural arch. From the cretaceous clays of New 

 Jersey, the No. 1 of Meek and Hayden. 



Stated Meeting^ January 7th^ 1870. 

 Present, fifteen members. 

 Mr. Fraley, Vice-President, in the Chair. 

 Prof. Marsh, of Yale College, was introduced and took his 

 seat. 



A letter of envoy was received from the Central Physical 



