AND AVES OF NOKTU AMERICA. 



107 



In. 



Thickness costal, 



" marginal, 



" episternal (average), 



" xiphisternal near outer margin, 



Expanse trochanters, 

 Long diameter shaft femur, 



head of coracoid, 



Lin. 

 5. 

 9.7 

 9. 



7.8 

 3. 



8. 

 17.5 



A largo species is represented by numerous fragments from the Miocene marls of Eastern North Carolina, found 

 for the most part by the Geological Surveyors under Prof. Ken-. This genus is Cretaceous, and is probably intrusive 

 in Miocene beds. It occurs in fragments in connection with the cretaceous Dinosauria, Ilipsibema Cope, and Eadl'O- 

 saurus Loidy, in the few places where they have been found. As the species cannot be well defined, I do not name it. 



A large part of tbo left xiphisternal, with the adjacent part of the hypostcrnal, tbe former bearing the anterior 

 part of I, he imhic sutural scar, was found in the marl at James King's. The size and thickness of the parts indicate 

 tbe largest species of the genus, being at least equal to the same parts in P. strenuus. As the pubic suture is not 

 preserved in the specimen of P. strenuus, I Unci the distinction to bo only indicated by the structure of tbe osseous 

 tissue. This is very much more dense than in the species found in New Jersey, where it is very spongy and open, 

 more so than in the other species. The inferior dense layer is thick, but not thicker than in P. strenuus. The infe- 

 rior surface is somewhat worn, ami does not display marked structure. The pubic sear is elevated, and bears longi- 

 tudinal sutural ridges; it presents the usual obliquity inwards and forwards. 



Thickness at hypostcrnal suture, 

 Width base pubic scar, 



Lines. 

 0.5 

 18. 



TAPHROSPHYS NOPOSUS, Cope. 



This species is chiefly represented by a number of broken costal and marginal bones, from Hornerstown, Mon- 

 mouth County, New Jersey. A costal plate with rib-head from Tinton Palls, Monmouth County, is also in the col- 

 lection of the New Jersey Geologioal Survey, and I have found other portions near Barnesboro, Gloucester County. 

 It is one of the rarest, as well as most strikingly marked, of our extinct Testudinata. 



The costal bones are thin for their size, which exceeds that of other species of our extinct Pleurodira except the 

 hist. The prominent character is seen in the sculpture, which consists of elevated coarse ridges, forming a reti- 

 culate pattern, somewhat as in Trionyx, which are frequently broken into tubercles of various shapes, which arc 

 again oonfluent in some places, forming shorter or longer ribs. These may be short, ourved, or angulate ; there is a 

 series of short straight ones radiating from the intercostal sutures on some of the costal bones. These projections 



are everywhere in strong relief. Portions of two marginal bones fix the position of the species here, and forbid any 

 immediate affinity to the Trionyehidao or Chelydrinac, though the resemblance to Peritrcsius ornatus cannot be over- 

 looked. These bones are marked by impressed pits, less marked than those of the costals. They present an obtuse 

 angle of faces, inclined at more than 90°, showing the bridge to be less angulate than in either P. suleatus or Taph- 

 rosphys molops. On one of the costals traces of the intercostal dermal suture are visible in a continuous groove of the 

 sculpture. Width of a costal bone 2 in., 9 lin. 



I am indebted to John Meirs for this specimen, which was found eighteen feet below the surface of the chocolate 

 marl, which lies below the upper bed of green sand. 



Another individual is represented by a, portion of the plastron taken from the chocolate marl near Barnesboro, at 

 a locality dilt'erent from any of the other species. There is not enough preserved to exhibit the ischiadic attachment j 

 it is therefore uncertain to what genus it belongs. It exhibits, however, the peculiar reticulate sculpture of the P. 

 princeps, but carried to a higher degree. 



It differs in that the surface of the bone is tuborculately rugose, the grooves being deep and wide, and leaving 



