'240 



THE EXTINCT BATRACIIIA, REPTILIA 



Curassow. It is stouter than In the latter; the glenoid cavity or surface is longer than in the latter, entering 4.5 times 

 the length; in the turkey the same; in Crax alector 5.5 times. The inner ridge to which the ligamentous sheet from 

 the clavicle is attached, is strong as in the turkey; the external ridge is also well marked, and the scapular surface is 

 more prominent posteriorly than in the Crax alector. The posterior (ace is flatter and wider than in the latter, and 



with several small ridges. The distal articular extremity is gone. The size of the pneumatic foramen is Intermediate 

 between that of the turkey and Curassow. 



Measurements. M. 



Length of tibia, 0.245 



" " anterior crest, 0.082 



" " fibular ridge, 0.051 



Diameter of head, antero-posterior, 0.089 



" " transverse, with ext. crest, 0.045 



" " " without do., 0.08 



" " shortest (diagonal), 0.0245 



" of condyles, transverse, 0.017 



" " " antero-posterior (outer), 0.0178 



" shaft, transverse (at middle), 0.0125 



" " shorter " 0.0105 



Length femur, actual, 0.110 



" " restored, 0.140 



Diameter of shaft below neck (transverse), 0.022 



" " at middle " 0.0185 



Length eoraeoid, actual, 0.112 



" " restored, 0.115 



" head from glenoid surface, 0.021 



Diameter, transverse, at middle, 0.018 



" " " end foramen, 0.022 



" antero-posterior, at middle, 0.012 



In recapitulation it may bo noted, that the characters in which this species differs 

 from the common turkey are, the longer tibia and femur, the greater slonderuesx of the 

 same, and the larger pneumatic foramen of the eoraeoid bone. 



The specimens on which it is based were discovered some three or four feet in the Cretaceous marl of the lower 

 bed, by my Mend, Dr. (!. ('. Thompson. Their mineral condition indicates, however, very plainly, that they are not, 

 Cretaceous fossils but tertiary, and I have no doubt they were either dragged into a burrow which entered the Cre- 

 taceous bed, which is in the locality in question near the surface, by a, carnivorous animal, or really fell into a, cavity 

 from (lie thin layer of Tertiary, probably postpliocene, sand which lies immediately above if. The remains were ac- 

 companied by those of a Mammal, which Dr. Thompson assured me lie took out with them. 



Postplioeene of Monmouth Co., New Jersey. 



OX FOOT IMI'lUvSSIONS OP EXTINCT BATRACIIIA AND REPTILIA. 



As is well known, those species pertaining to the classes treated of in the preceding essay, which lived in or near 

 u ;ilcr, have left impressions of their feet on the ancient mud-flats, and lake and ocean shores. Commencing with those 



which have been discovered in the lowest rocks, we have three species from the Carboniferous formation. The oldest 

 is represented by two series of impresions, obtained at different times, in the red shales which pertain to the upper 

 division of the subcarboniferous (Lesley), at a point seven hundred feet below its upper surface. The next, in order, 

 is indicated by a few tracks from the shales of the coal measures, from a point SOOfeet above the conglomerate (Gabb), 

 and therefore, 8450 led. from the top of the coal measures. The latest of these tracks, which were found still higher, 

 came from a point 800 feet below the surface of the coal. 



