PLES10SAURID.E. 139 



middle of the shaft 0,172 (7*25 inches), and the width of 

 the distal extremity 0,316 (12-75 inches) ; it is probable, 

 however, that a portion of the postaxial border is wanting 

 at the distal extremity ; since in a specimen in the 

 collection of Mr. M. Fisher, of Ely, the length is 0,936 

 (37 inches), and the distal diameter abont 0,430 (17 

 inches). Phillips notices the present specimen on p. 357 

 under the name of P. grandis, as indicating a form closely 

 allied to the type femur, but mentions a difference at the 

 distal extremity of the femur, which, however, may 

 perfectly well be due to imperfection or to the effects of 

 pressure. Mention is also made of this specimen by 

 Hulke in the ' Quart. Journ. Geol. Soc' vol. xxvi. pp. 

 620, 621, where it is suggested that a third bone may 

 have articulated with the femur; a view which is not 

 supported by the limbs of Peloneustes philarchus. 



Purchased. 



47884. A tibia and the inner half of an associated fibula; from 

 Shotover. Transverse diameter of tibia 0,180 (7*1 inches), 

 vertical 0,100 (3-95). 



Presented by the Hon. R. Marsham, 1877. 



46469. A tibiale ; from Devizes. Same history. 



32500. Cast of a very large pubis. The original was obtained 

 from the Kimeridge Clay of Ely, and is in the collection 

 of Mr. Fisher. The antero-postcrior diameter is about 

 0,660 (26 inches) ; and the specimen presents the squared 

 contour characteristic of the genus. An ischium from the 

 same deposit preserved in the same collection has a length 

 of 0,556 (22 inches), and a diameter of 0,443 (17*5 

 inches) at the proximal extremity; it would agree in 

 relative size with this pubis, and has the same contour as 

 the ischium of Peloneustes cequalis. 



Presented by (Jeorge Baird, Esq., 1857. 



Remains of Immature Pliosatjrs. 



Including : — Plesiomnrus brachyspondylus, Owen \ 

 Plesiosaurus recentior, Meyer'". 

 J 'lesiosaurus Uevis, Owen :| . 



1 Kep. Brit. Assoc, for 1839, p. 78 (1840). 



- Palaologica, p. 112 (1832). 



: ' Cat. Foes. Kept. Mus. R. Coll. Surgeons, p. 02 (1854). 



