264 SQTJAMATA. 



42948 g. The imperfect centrum of a posterior trunk vertebra. 



42946 h. The centrum of a posterior trunk vertebra. 



42946 i. The imperfect centrum of a smaller trunk vertebra. 



42946 j, k. Two similar but smaller centra. 



42946 1. Three imperfect posterior trunk vertebra?. 



42934. An anterior or middle caudal vertebra with the entire 

 chevron attached. 



42946 m. The centrum of a similar vertebra. 



42946 n. The centra of two posterior caudal vertebrae. 



42946 0. Six imperfect posterior caudal vertebrae. 



42944. An imperfect posterior caudal vertebra. 



11589 a. Cast of a bone which is probably an ulna. 



Mantell Collection. 



42961. A bone probably belonging to the carpus. 



42943, 42945. Two imperfect undetermined bones. 



Mosasaurus dekayi, Bronn \ 

 The following specimen is provisionally referred to this species, but 

 may belong to M. maooimus, Cope 2 . The teeth are fully as large 

 as those of M. camperi. The synonymy is given by Cope 3 . 

 Hah. North America. 



11590. Cast of a tooth. The original was obtained from the Upper 

 Cretaceous of New Jersey, U. S. A., and is figured by Leidy 

 in his ' Cretaceous Reptiles of the United States ' (Smith. 

 Contrib. Knowl.), pi. x. fig. 3. 



Mantell Collection. Purchased, 1838. 



Genus LIODON, Owen 4 . 

 Including :— Nectoportheus, Cope 5 ; Rhinosaurus, Marsh . 

 Rhamphosaurus, Cope 7 ; Tylosaurus, Marsh 8 . 



Assuming that the American forms are rightly referred to this 



1 ' Letheea Geognostica,' 2nd ed. p. 760 (1837). 



2 Proc. Post. Soc. Nat. Hist. vol. xii. p. 262 (1869). 



3 Trans. Amer. Phil. Soc. vol. xiv. p. 193 (1870). 



4 ' Odontography;' p. 261 (1840).— Amended. 



5 Proc. Ac. Nat. Sci. Philad. 1868, p. 181. 



6 Amer. Journ. ser. 3, vol. iii. p. 461 (1872). — Preoccupied. 



7 I 'roc. Ac. Nat. Sci. Philad. 1872, p. 141.— Preoccupied. 



8 Op. cit. vol. iv. p. 147 (1872). 



