102 proceedings op the academy of 



April 11. 



The President, Dr. Ruschenberqer, in the chair. 

 Twenty-eight members present. 



The death of Prof. Constant Dumeril, of Paris, was announced. 

 A paper was presented for publication entitled — 

 "Morphology of the Carpellary scales in Laris." By Thomas 

 Meehan. 



April 18. 



Mr. Yaux, Yice-President, in the chair. 

 Twenty-nine members present. 



Prof. Leidy made the following remarks on some extinct turtles 

 from Wyoming Territory : — 



Several species of extinct turtles from the tertiary deposits of 

 Wyoming differ from those previously described by me from the 

 same formation. They are indicated by imperfect, though suffi- 

 cientl3' characteristic, remains, sent to me by Dr. J. Van A. Carter, 

 of Fort Bridger ; and by others obtained during Prof. Haj^den's 

 exploring expedition the last 3'ear. 



Anosteira ornata. — One of the turtles is founded upon a num- 

 ber of isolated plates and fragments of others of the carapace of 

 about four different individuals, obtained from Church Buttes and 

 Grizzly Buttes, Wj'oming. The specimens are mainly marginal, 

 including two pygal plates. The latter are remarkably thick at 

 the fore part, where they are hollowed into a concavity directed 

 forward, and l*ounded below by a projecting ledge. This con- 

 cavity continues outward and forward upon the contiguous mar- 

 ginal plates as a groove, bounded by an inferior ledge, which 

 would aiJi)ear gradually to become narrower, and disappear at the 

 third marginal plates in advance. The upper part of the pygal 

 plate slopes on each side from a median acute ridge or carina, 

 which subsides at the posterior third. The marginal and P3'gal 

 have all been conjoined with the costal plates by suture, and the 

 former in addition by gomphosis, as in living emydes. The free 

 surfaces of the plates are closely covered with radiant elevations. 

 These centrall}^ form rounded tubercles and peripherally more or 

 less interrupted ridges with more or less interrupted branches. 

 Apparently' in j^ounger plates the elevations form more continuous 

 radiant and branching ridges, which wcnild api)ear in older animals 

 to have become more and more broken so as to form rounded 

 tubercles. In some specimens the radiant ridged appearance is 

 more conspicuous on the under surface of the marginal plates, 



[July 4, 



