190 



THE EXTINCT BATRACIIIA, REPTILIA 



prolonged into a process below, which is merely rudimentarj in the two species named. The oentra of the dorsal 

 vertebra are very cylindrio, and shortened antero-posteriorly. [n an anterior, with diapophyses directed obliquely up- 

 wards, the centrum is very convex in oross-seotion beneath and the artioular faoes are a little deeper than wide. In 

 more posterior dorsals, with diapophyses at the middle of the oentrum, the inferior convexity is also very strong, 

 The articular ball is subpentagonal in outline, its lateral margin being remarkably prolonged forwards towards the 

 basis of the diapophysis. This form prepares us for subpentagonal lumbars such as characterize several speoies of 

 the genus. 



The hypapophysis of the axis is very stout, occupying its whole interior surface;; its artioular face is half as large 

 as the 1m.11 of the oentrum, its posterior margin extending as far as the line of the edge of the hall. The latter a, little 

 broader than deep. That of the seventh to ninth cervical is more nearly round. The diapophysis of the latter has a 

 triangular section, a plane face being anterior, and angle, posterior. 



Length of (7th, 8th or 9th?.i cervical, 



Width ball, 



" neural canal, 

 Expanse of diapophyses, 

 Length nenrapophysis of atlas, 



" of a, median dorsal, 

 Width ball of do., 

 Dcnfh do. do., 



Length of os quadrature, 



" proximal articular face, 

 " distal 

 Width proximal extremity -greatest, 

 " " " —least, 



" great, ala, at middle (within), 



This animal, if the measurements of the Kansas specimen are to be relied on, must have reached a, length of seventy 



feet. 



Portions of an individual of similar proportions are preserved in the Cabinet of the Burlington Co. Lyceum. 



which were found in Gloucester Co., on the farm of David IS. Coles. They consist of two cervicitis, Ave dorsals and 



three oaudals. Those of the first two series resemble those of the Monmouth Co. individual exactly, while tin; oau- 

 dals furnish important additional characters. The latter are furnished with coossirled chevron bones, and their di- 

 apophyses are situated a, little above them, and have an Oval section, 'the articular faces are more nearly r id 



than in some other species, e. g. M. dekayi, and are as deep as wide, with but a slight truncation on the upper ex- 

 ternal outlines. 



Lines. 



88.5 



lifi.T 

 :i!». 



In. 



Lin. 



4 



1 0.5 



8 







10 



7 



5 



4. 





'4 





;i 



5 



:i 



2 



7 



* 



5 



(i 



2 



5 





2 



1 



1 



5 



2 



8 



Length centrum, 



Depth ball. 



Width do.. 



A more posterior caudal of an individual of I he same size, in the Museum of the Acad. Nat,. Sciences, is smaller, 

 and exhibits diapophyses at a, slightly higher position, and more cylindric. Its proportions arc quite similar to those 

 of the caudal measured above. Prom this cause I am disposed to think that this species may have had sub-round, or 



very slightly compressed caudals, far posteriorly in the series, as in M. missuriensis. Nee the measurements of the 

 corresponding vertebral of M. dekayi. 



The remains of a. still more gigantic individual of Ibis species were submitted to me, by Dr. (f. ,1. Fisher, of Sing 

 Sing, New York, in whose possession they now arc. 



The bones were obtained through the efforts of P. R. Brinckerhoff, of Westchester County, N\ Y '., in the latter 



