NATURAL SCIENCES OF PHILADELPHIA. l'J', 



November 8th. 



The President, Dr. Ruschenberger, in the Chair. 



Twenty-two members present. 



A paper was presented for publication entitled, " Bud Varieties," 

 by Thomas Meehan. 



Prof. Leidy directed attention to some remains of reptiles on the table 

 which were part of the collection of fossils recently sent to him from Wyo- 

 ming by Prof. Hayden. They consist of the remains of three species of tur- 

 tles and a lacertian, which were briefly characterized and named as follows : 



Emys Jbanesi. The species is founded upon a shell consisting of the nearly 

 complete carapace and sternum, the former much crushed and distorted late- 

 rally. The carapace has been prominently convex, with the margins acute 

 and without conspicuous indentations. The sternum is as well developed as 

 in our common living emydes and of the same shape. The fore part of the 

 sternum forms a semicircle slightly truncate ; the back part Is moderately 

 notched, the notch being about half an inch in depth. 



The intermediate vertebral scutes are longer than broad, and their anterior 

 margin is transversely bow-like, with a deep median angle forward. The sides 

 of the second vertebral scute, joining the first pair of costal scutes, are con- 

 vex outwardly ; joining the second of the latter, are convex inwardly. 



The axillary and inguinal scutes are broader than long. The abdominal 

 and femoral scutes are of nearly equal depth, about 2 J inches; the humeral 

 are half an inch less; and the pectoral and caudal an inch less. 



The sternum is a foot in length ; its anterior portion is 3J inches deep and 

 5 inches wide ; its posterior portion 3f inches deep and 5J inches wide. 



The length of the carapace in the curve has been about fifteen inches ; the 

 width about nine and a half inches. 



The species I have dedicated to my friend Joseph Jeanes, through whose aid 

 we have been enabled to make many additions to the store of palajontological 

 knowledge. 



Emys Haydeni. This species is founded upon an imperfect carapace of an 

 animal probably about the size of the last, but which had not yet reached 

 maturity. It may be distinguished from it by the form of the scute impres- 

 sions. The intermediate vertebral scutes are longer than broad, as in the for- 

 mer. The anterior border of the second vertebral scute is straight, as are 

 also the sides of junction with the first pair of costal scutes, the three lines 

 together forming three sides of a square. The anterior border of the third 

 vertebral scute is nearly straight ; and that of the fourth is deeply bow-like 

 aud convex backward. 



Notwithstanding I have already dedicated several extinct species of animals 

 to my friend Prof. Hayden, I still add another to the list in commemoration of 

 the very many discoveries he has made in vertebrate palasontology. 



Baena arenosa. The genus and species are founded on the greater part of 

 the shell of a turtle, with the carapace broken away in front and fractured in 

 other positions. The sternum, more perfect, has lost its fore extremity. The 

 shell belonged to a mature animal, as indicated by the obliteration of the su- 

 tures of the plates composing the carapace. The surface of the latter, but 

 more especially that of the sternum, presents a finely fretted appearance. 



The carapace is moderately convex and bears a resemblance to that of our 

 common Snapper {Chelydra serpentina). It is, however, not depressed along 

 the middle, which is the most elevated portion of the fossil. The lateral mar- 

 ginal plates are comparatively large and broad, and are abruptly bent. The 

 posterior portion of the carapace, both laterally and at the extremity, is 



1870.] 



