AND AVES OF NORTH AMERICA. 



231 





In. 



Lin. 





Length (not restored,) 



7 



■ 11 



Diameter median, 



Diameter proximal, 



1 



10 



" distal, 



Lin. 

 14 

 3(1 



Portions of shafts, etc. of most of the other long bones are preserved. 



Both ilia remain, one quite perfect. The latter is more prolonged posteriorly than in Cuvier's figure of that 

 bone in Crocodilus biporoatus. The anterior half is much like that in a large smooth toothed 1 [olops from Tinton Falls 

 N. J., lull, presents a pit just behind the anterior tuberosity not found in it. There is a separate oval articular lace 

 below this tuberosity at the usual pubic articulation. The anterior angle of the crest of the ilium is not prominent : 

 more so in the Holops above noted. Crest longitudinally rugose. 



In. Lin. 



Length ilium, (i 7 



Depth behind ischiadic suture, 2 3 



Depth at do :l 5.7 



Depth anterior tuberosity. 

 Length posterior hook ilium, 



Lin. 

 22.4 

 32.2 



The dermal bones are very characteristic and distinguish the genus. They differ in two points from those of Tho- 

 racosaurus and Holops ; first, in having no pits ; second, in having a, prominent median keel. They are rather small 

 subquadrate, and with a, very thick, always obtuse, and sometimes elevated median carina. The latter lias rather the 

 form of a, knob. Many of the bones consist chiefly of tins knob with a small basis. The superior surface is dotted 

 with a. few punctffi and grooves. Length of one of Hie largest 21 1 lines ; depth 5 lines ; width 11.5. Those probably 

 of the cervical or anterior dorsal region have been described by me under Holops obscurus, p. 78. I believe they should 

 be referred here, as those from the dorsal region of the present specimen approach them very closely. Those referred 

 to the Bottosaurus, p. (id, should bo assigned elsewhere. 



From the upper bed of upper Cretaceous green-sand New Jersey. Discovered by .ludson (!. (faskill, to whom I 

 am indebted for portions two individuals. 



Holops, Cope. 



Holops basitrunoatus Owen, Crocodilus basitruncatus, Owen, Journ. Geol. Soc. Loud. V., 184A, ,180 ; Palaeontology, 1800, 

 277 ; Pictct Traito do Paleeontologie, I., 1853, 482. Bottosaurus harlani pars Leidy Cretao. Rept. N. Am. Copo 

 liuj. op. p, 66. 

 Specimens referred to Bottosaurus by me, after Leidy, with doubt, appears to me now to represent a true Holops. 

 The vertebra) and bones described under that head in this work, p.p. OG-7, I accordingly refer to the latter genus 

 as well as fragments of cranium with cervical vertebra from the same localities, referred with doubt to Holops obscu- 

 rus, and described, p. 77, with cuts 19, 20, of the muzzle. The enamel of the tooth in this species is not fluted. 



Holops glyptodon Cope Bujus operis, p. 71. 



Two additional specimens of this species, one from liarnesboro and one from Mullica Hill, N. .J., indicated that this 

 species is a (Javia! of the genus Holops. The character of the fluted teeth is well marked. The median dorsal ver- 

 tebra 1 , are compressed as in II. obscurus, while some of the ccrvicals display a, prominent transverse crest in fronl 

 as in II. basitruncatus, and much more prominent and extended transversely than in II. obscurus ; size similar to H. 

 obscurus. It maybe observed that seven examples of the latter confirm its characters. 



Thecachampsa, Copo. 



The form of the cervical vertebras in this genus was left uncertain in Synopsis of genera, of Mx f inct Crocodilia. p, 

 02. I am now able to slate that Ihe.y possess the elongate simple hypapophyses of Crocodilus, and are quite different 

 from those of Thoraeosa urns. This supposed tertiary Crocodile with bifid hypapophyses, mentioned 1. c, is from a 

 Cretaceous bed in the neighborhood of an Eocene outcrop. 



