74 THE EXTINCT BATRACHIA, KEPTILIA 



Third cervical : length to shoulder, 



" " " opposite posterior angle parapophysis, 



" " width between latter points, 



'' " least width behind parapophyses, 



" vertical diameter cup, 



" transverse diameter cup, above, 



" below, 



Fourth cervical : length to shoulder, 



" " " end parapophysis, 



Third dorsal : length to shoulder, 



" " " opposite posterior angle parapophysis, 



" " " of basis of hypapophysis, 



" " width between ends of parapophyses, 



" " " of neural arch just behind diapophyses, 



" " " of anterior cup, 



" " " of neural arch, 



" vertical diameter neural arch, 



" " " cup, 



Fifth dorsal : length to shoulder, 



" " " basis hypapophysis, 



" " width of centrum at middle, 



" " " cup, 



" " vertical diameter at middle, 

 Lumbar : length to> shoulder, 

 " vertical diameter cup, 



" transverse, 



Portions of the frontal and parietal bones of a gavial are figured by Leidy (III., fig. 8). They are shown under 

 the head of H. brevispinis not to be referable to the cranium of that species, or of H. tenebrosus ; whether they can 

 be referred to H. obscurus, H. cordatus, or H. glyptodon is as yet uncertain. 



This species is no doubt a gavial-like animal, very near the T. obscurus. It is sufficiently different in vertebral 

 structure ; probably other differences will be found where other bones are known. 



HOLOPS GLYPTODON, Cope. 

 Tlioracosaurus glyptodon Cope. Geol. Survey of New Jersey, Appendix C. 



This species is indicated by a few teeth only, but they are of so marked a character as to render their recognition 

 and arrangement proper. 



The best preserved specimen indicates a slender, subcylindrical strongly curved crown, with the acute ridge 

 which divides the planes extending to its base. There are probably nine obtuse ridges on the inner or concave face, 

 each about as wide as each interval. Both ridges and grooves are covered with sharp fine longitudinal striae, which 

 are continually interrupted and irregular. 



The pulp cavity, as on others of the genus, is rat her small. Length of crown, 12 lines ; diameter at base, 4.5 1. 

 The apex is slightly compressed and smooth. In an older specimen the minute striae are less distinct, leaving the 

 fluting. 



From Barnesboro, Gloucester Co., N. J. Not found with or near any of the preceding specimens, but with 

 dermal plates not distinguishable from those of H. obscurus. 



In. 



Lin. 



2 



0.75 



1 



4.5 



1 



10.5 



1 



2. 



1 



5.25 



1 



5.25 





11. 



2 





1 



2.25 





23. 





10.5 





14.25 





33.75 





26. 





22.5 





5.25 





7.5 





19. 





21. 





14. 





12.25 





21.25 





18. 





25.5 





20. 





19. 



