ATLANTOSATJKID^. 



145 



Atlantosaurus immanis, Marsh \ 



Distinguished from A. montanus by its superior dimensions; the 

 length of the femur being 2,700 (96 inches). Possibly this species 

 should be referred to Apatosaurus 2 . 



Hob. North America. 



R. 338. Cast of the left femur. The original is the type, and was 

 obtained from the Upper Jurassic of Colorado, U.S.A. ; it 

 is preserved in the Museum of Tale College, Newhaven, 

 Connecticut, U.S.A., and is described by Marsh in the 

 < Amer. Journ.' ser. 3, vol. xv. p. 240 (1878). 



Presented bij Prof. 0. G. Marsh, 1883. 



** Genus PELOROSAURUS, ManteU 3 . 



Known only by the humerus. That bone approximates to the 

 humerus of Brontosaurus, and may not improbably, as suggested by 

 Seeley 4 , belong to Orniihopsis. The type specimen has a median 

 cavity, but this may perhaps be due to decay. Although the name 

 Pelorosaurus is much earlier than Ornithopsis, it seems preferable, if 

 the two be identical, to retain the latter. 



** Pelorosaurus conybeari, ManteU 5 . 



The type species. The type specimen agrees in relative size with 

 the pelvis of Ornithopsis hulkei. 

 Hab. Europe (England). 



28626. The slightly imperfect right humerus ; from the Wealden of 

 {Fig.) Cuckfield, Sussex. The type specimen ; figured by Man- 

 tell in the ' Phil. Trans.' 1850, pi. xxi., and by Owen in 

 his ' Wealden and Purbeck Reptilia/ suppl. ii. pi. xii. 



ManteU Collection. Purchased, 1853. 



R. 713. The shaft of a left humerus, provisionally referred to a 

 young or female individual of this form ; from the Wealden 

 of Sandown, Isle of Wight. This bone apparently 

 presents no characters by which it can be specifically 

 distinguished from the type specimen. 



Presented by J. E. Lee, Esq., 1885. 



1 Amer. Journ. ser. 3, vol. xv. p. 241 (1878). 



2 See Marsh, op. cit. vol. xvii. p. 89 (1879). 

 Phil. Trans. 1850, p. 379. 



4 G-eol. Mag. 1887, p. 479. 5 Op. cit. p. 386. 



L 



