ICHTHYOSATTRID.E. 101 



R. 1343. A smaller tooth ; from Lyme-Regis. Harford Collection. 



46. The crown of a very large tooth, with the contour of the basal 

 portion distorted by pressure ; from Lyme-Regis. 



Presented by Sir Henry de la Beche. 



2150*. The conjoint atlas and axis vertebrae with their intercentrum 

 of a very large individual ; from Lyme-Regis. These 

 specimens are apparently associated with the basioccipital 

 JS r o. 2149 * (p. 99). Hawkins Collection. 



481. The centra of seventy associated cervical, dorsal, and caudal 

 vertebras and portions of ribs, together with the scapulas 

 and coracoids, of a very large individual; from Lyme-Regis. 

 These specimens, which were collected by Miss Anning, are 

 referred to the present species on account of their large 

 size. The vertebras are noticed by Owen in the ' Rep. 

 Brit. Assoc' for 1839, p. 116, where it is stated (from the 

 inclusion of other specimens) that the series numbered 

 150 centra. The largest centra have a vertical diameter of 

 0,160 (6*3 inches), and a transverse of 0,170 (6'6 inches). 

 The cervicals are elongated transversely, the upper costal 

 tubercle being placed mainly on the arch. In the early 

 posterior dorsals (marked 26 and 27) the centrum is 

 transversely elongated, the costal tubercles being approxi- 

 mated, and coalescing on the left side of No. 26. In the 

 later posterior dorsals (No. 33) the centrum becomes 

 narrowed superiorly (as in 2". trigonus, fig. 14), and the 

 costal tubercles are again placed wider apart ; they coalesce 

 in No. 36, which may accordingly be reckoned as the first 

 caudal. The coracoids have no posterior notch, and 

 approximate to the type of those of i". zetlandicus (fig. 30), 

 although they appear to have been shorter. The ridge on 

 the anterior border of the dorsal border of the proximal 

 extremity of the scapula is distinct. 



Purchased. About 1840. 



The reference of some of the following specimens is provisional. 

 R. 1169. The centrum of what is probably the third cervical 

 vertebra; from Lyme-Regis. There is an intercentral 

 facet inferiorly. No history. 



37707. The centrum of a middle dorsal vertebra of enormous 

 dimensions ; from the Lower Lias of Gloucestershire. 

 This specimen, which agrees in characters with the 



