180 SAUB.OPXERYGIA. 



Tlie undermentioned specimens are referred to the present species 

 by its founder. 



32835. An imperfect tooth of large size, partly imbedded in matrix ; 



{Fig.) from the Upper Chalk of Kent. Figured by Owen in his 

 ' Cretaceous Keptilia' (Mon. Pal. Soc.) pt. i. pi. xiv. fig. 4 

 (reversed). This specimen agrees in every respect with 

 the type teeth of Lutkesaurus figured by Kiprijanoff in the 

 ' Mem. Ac. Imp. St. Petersbourg,' vol. xxxi. pi. xvii., 

 showing the same fine and closely approximated ridges, of 

 which the summits carry a series of small pustules. 



Taylor Collection. 



R. 1215. The broken base of the crown of a similar tooth ; from 

 the Chalk of Kent. JS T o history. 



35268. An imperfect and smaller tooth probably belonging to this 

 form ; from the Cambridge Greensand. The ridges have 

 been somewhat worn away by the action of water. 



Purchased, 1859. 



Genus CIMOLIOSAURUS, Leidy \ 

 Including: — Discosaurus, Leidy 2 . 

 Brimosaurus, Leidy 3 . 

 Elasmosaurus, Cope 4 . 

 Polycotylus, Cope 5 . 

 Mauisaurus, Hector 6 . 

 Murcenosaurus, Seeley 7 . 

 Colymbosaurus, Seeley 8 . 

 ? Oligosomus, Leidy 9 . 

 ? Piptomerus, Cope 10 . 

 ? Trinacromerum, Cragin 1] . 



Skull relatively small, with short mandibular symphysis. Teeth 

 slender and not carinated ; the anterior ones not enlarged. Neck 

 usually greatly elongated, with the anterior vertebras very small. 

 Vertebras with the arches and cervical ribs usually completely 

 anchylosed to the centrum, with frequent obliteration of the suture, 

 and with curved zygapophyses and strongly developed zygosphenes. 



1 Proc. Ac. Nat. Sci. Philad. for 1851, p. 325 (1852).— Amended. 



2 Ibid. p. 326. 



3 Ibid, for 1854, p. 72 (1854). 



4 Ibid, for 1868, p. 92 (1868). 



5 Trans. Amer. Phil. Soc. vol. xiv. pt. i. p. 34 (1870). 



6 Trans. N. Zealand Inst. vol. vi. p. 346 (1874). 



7 Quart. Journ. Geol. Soc. vol. xxx. p. 197 (1874). 



8 Ibid. p. 447. 



9 Proc. Ac. Nat. Sci. Philad. for 1872, p. 39 (1872). 



10 Amer. Nat. vol. xxi. p. 564 (1887). 



11 Amer. Geol. vol. ii. p. 405 (1888). 



