PLESIOSATTRIDJE. 



265 



Most of the following specimens probably belong either to P. hawkinsi 

 or to the above-mentioned unnamed form. 



2055*. 



Two imperfect late immature cervical vertebrae; from the 

 Lower Lias of (?) Lyme-Regis, Dorsetshire. In the speci- 

 men figured in the accompanying woodcut the dimensions 

 of the centrum are : — length 0,029 (1*16 inches), height 

 0,028 (1-1 inches), width 0,037 (L45 inches). In size 

 these specimens accord with the later cervicals of No. 2020*, 



Pig. 80. 



Plesiosaurus (cf.) hawkinsi. — Anterior and left lateral aspects of a later cervical 

 vertebra ; from the Lower Lias of Lyme-Kegis. f . Letters as in fig. 69, p. 225. 



but the costal facets are placed lower down on the cen- 

 trum, in which respect they resemble Nos. 2021* and 

 14550. The arches and ribs are not anchylosed to the 

 centra. Hawlcins Collection. Purchased, 1884. 



2055 * a. A similar, but rather smaller imperfect cervical vertebra ; 

 from Lyme-Regis. The neuro-central suture is distinct 

 and the ribs are wanting. Hawkins Collection. 



R. 227 a. Two imperfect anterior cervical vertebra), apparently re- 

 sembling those of the skeleton No. 2022* •" from Lyme- 

 Eegis. The neuro-central suture is obliterated, and the 

 ribs are firmly anchylosed to the centrum. 



Presented by Dr. II. Woodward, 1882. 



