26 CIMOLIASAURUS. 



New Jersey. The vertebrre have slightly biconcave bodies and are usually Avell 

 preserved, though all the specimens I luive had the opportunity of examining have 

 had their arches and processes broken off, apparently after their discovery. Of such 

 vertebrre thirteen specimens, from Burlington County, N. J., were presented to the 

 Academy of Natural Sciences by Dr. S. G. Morton. They appear to have belonged 

 to the same individual, and consist, as I suppose them to be, of two dorsals and 

 eleven lumbars. 



The body of the dorsal vertebrae. Figs. 13-16, Plate V, is the transverse section 

 of a cylinder compressed from above downward and contracted towards the middle, 

 resembling in form the body of the cervical vertebra referred to Discosaunts. The 

 articular faces are transversely oval, slightly emargiuate above, and are more concave 

 than in the cervical vertebra of Discosaums. They present a central prominence, 

 are bevelled off at the border, and are defined by a subacute edge from the rest of 

 the body. A pair of large venous foramina underneath the latter communicate with 

 channels opening by a single large orifice in the spinal canal, A\liich is depressed 

 towards the middle and wide. The vertebral arch has been coosified with the 

 body, but its loss prevents mie from ascertaining anything in regard to its form. In 

 one of the specimens, as represented in Figs. 13, 14, 15, there projects from the 

 middle of the side of the body a short, robust, cylindroid transverse process, termi- 

 nating in a large irregular facet for the articulation of a rib. In tlic other vertebra. 

 Fig. 16, probably a more anterior one, the transverse process is broken, but its base 

 indicates it to have been of greater vertical extent than in the former specimen, 

 though not quite so Avide, nor does it extend so low, but above appears nearly to 

 have reached the abutment of the vertebral arch. 



The size of the two specimens is nearly equal, their measurements being as 

 follows : — 



Lines. 



Lengtii of the vertebral body 32-33 



Breadth of articular surfaces .......... 52 



Height 42 



Width of spinal canal at the middle ......... 12 



Width of spinal canal at the extremities 15 



Breadth between articular facets of transverse processes . . . .- . 72 



The eleven lumbar vertebrae, of which the largest and smallest specimens are 

 represented in Figs. 17-19, Plate V, and 16-18, Plate VI, do not form an unbroken 

 series, but the specimens successively diminish in size from nearly that of the dorsals 

 just described, to a size rather less than the supposed caudals of Discosaurus. They 

 are nearly identical in form throughout. The more anterior have the body abso- 

 lutely somewhat longer than in the dorsals, though the other diameters are dimi- 

 nished. The articular extremities are also slightly more dished than in the dorsals, 

 and almost devoid of the central prominence. The venous foramina on the under 

 part of the body are nearer together, and the intervening portion of bone appears 

 pinched into a convex ridge. The more posterior specimens, which may be re- 

 garded as caudals, have the articular extremities of their body rather more concave, 

 and undern(>atli they do not form so prominent a ridge between the position of tlie 

 two venous foramina. 



