ijo. 16G6. OSTEOLOGY OF CAMPT08AVRU8—GILMORE. 295 



of the anterior caudal centra is greater vertically than transversely. 

 One of the sacro-caudals shows it to have had a transverse process 

 whose greatest width, at the point of origin at least, is in the vertical 

 direction. The more distal caudal vertebra^, of which there are three 

 present, show the same cylindrical shape, with long pre- and post- 

 zygapophyses, as found in O. hrowni 



The principal dimensions of the holotype are as follows: 



mm. 



Vertical depth of ilium from middle of acetabular l)order (estimated) 105 



Distance between pre- and post-acetabular notches 141 



Width of pubis 63 mm. from the anterior end 105 



(Jreatest length of sacro-dorsnl 58 



Greatest length of first sacral 53. 



Greatest length of second sacral 56 



Greatest vertical depth of sacro-dorsal (anterior end) 70 



Greatest length of caudal centrum bearing chevron (second?) 51 



Greatest width anterior end of caudal centrum bearing chevron (second?) 66 



Greatest height anteri<ir end caudal centrum bearing chevron (second?) 76 



A second specimen. Cat. No. 5820, U.S.N.M., consisting of the well 

 preserved anterior portion of a right ilium, collected by Mr. J. L. 

 Kenney from the Morrison beds of the Jurassic, near Como, Albany 

 County, Wyoming, undoubtedly pertains to this species (see fig. 47). 



CAMPTOSAURUS BROWNI, new species. 



Holotype.— Cut. No. 4282, U.S.N.M. From the Jurassic (Mor- 

 rison beds). Quarry No. 13, 8 miles east of Como, Albany County, 

 Wyoming. Collected by Mr. Fred Brow^n during the years 1885 and 

 1886. Named for the collector, whose discoveries of important fossil 

 sjjecimens have done much to further the science of paleontology. 



The typical specimen consists of a considerable portion of the 

 skeleton, and since the elements have been listed on page 203, it ap- 

 pears unnecessary to again enumerate them. As this skeleton is the 

 basis for that part of the present paper devoted to the osteology 

 of Cmnptosawus, where a detailed description of the bones compos- 

 ing it will be found, it is necessary here to discuss only those char- 

 acteristics by which it differs from the other known species. 



Specific characters. — Iliurrh of moderate depth., with long pre- and 

 post-acetdbular processes; the hinder /'ar^ especially narroic; su- 

 perior border slightly convex with oblique posterior portion short.. 

 Seven vertehrce., of which five are considered sacrals, united hy suture 

 in sacral region. Peg-and-notch articulation confined to the posterior 

 memhers and extending into the anterior caudals. Anterior sacral 

 vertebrae, compressed transversely. Last dorsal with ventral keel. 

 Ischia slender with light expanded distal ends. 



Typically the skeleton represents an animal about IG feet in length, 

 intermediate in size between C. dispar and C. mediiis. While it ap- 



