162 



TFIE EXTINCT BATKACIIIA, IlEI'TILIA 



In. 



2 

 1 



Lin. 

 4. 



7.5 



Anteroposterior extent of lust vertebral, 



Width to middle line, 



Thickness in front, 8. 



" [behind, 5.8 



Width costal near head, 1 9. 



Thickness costal near head, - 6- 



The presence of this azygus bone may be abnormal, in which case the group ProrJionias will not be distinguished 

 from Taphrosphys. 



vak. enodts, Cope. 



This may be a, smooth or worn individual of T. molops. The remains are in good condition, and do not appear 

 to have been eroded or corroded. Tt is indicated by a large portion of the plastron of a single individual from Barnes- 

 boro, N. J. It is a species of considerable size and solidity, and is distinguished by the entire absence of any sculp- 

 ture, or of grooves for the margins of horny scuta. The external margin of the whole length of the hypostcnial bone 

 is of equal thickness and nearly equally obtuse, a circumstance uncommon among tortoises. The vertical portion of 

 this bone is massive, indicating strong union with the carapace. The margin of the hyosternal, descending from the 

 bridge-process, is more compressed and acute, as are also other portions of the margin of the anterior lobe of the 

 sternum. 



The ischiadic scar is not far behind the hyosternal suture, and is quite elevated on a broad base. It is wider 

 behind than before. 



Measurements. In. Lin. 



Length of hyosternal from middle of vertical process, 4 3. 



Thickness of margin of do., 5. 



Length of pubic scar, 1 10.2 



Distance behind hyosternal suture, 1 2.5 



Thickness of xiphisternal near do. suture, r >- 



This may be an old T. molops worn smooth. 

 Position: — The upper green-sand bed of the upper cretaceous of New Jersey. 





TAPHROSPHYS LONGINUCIITIS, Cope. 



Spec. nov. 



Established Oil a nearly complete but much fractured individual, from the excavations of David Haines, N". Jersey. 

 This is one of the smaller species, and is of light construction, though rather stouter than the 'l\ sulcatus, Tn 

 many points it resembles the latter species, but differs in many others. 



A marked peculiarity is seen in the greater posterior prolongation of the first vertebra] dermal scutum. Its pos- 

 terior suture enters the first costal bono considerably nearer the costal than the nuchal suture; it is considerably nearer 

 the nuchal than the costal in T. molops, T. sulcatus, and T. leslianus. The costo-first-verl.ebral dermal sutures arc 

 thus less divergent, than iii T. leslianus, at least. The suture with the first vertebral bone is quite concave. The axil- 

 lary pit is strongly marked, but not so much so as in T. molops. 



M. M. 



Width lirst costal bone (proximal), 0.0045 



Thickness (posterior), .0085 



Width from costal suture to transverse dermal, .020 



" axillary pit, .0125 



Three vertebral bones indicate that the most elongate are not so slender as those of the genus Trionyx. The lat- 

 eral outlines arc straight and make an open angle with each other, the short anterior and posterior are gently convex 

 backwards. The last vertebral bone is small and subround. Three rudimental vertebrate were attached beneath the 



