256 SATJROPTERYOIA. 



the neural spines being tall and squared at the summits. Dorsals 

 with comparatively long and slightly cupped centra, with a tall 

 and pyriform neural canal. Humerus and femur rugose at the 

 extremities. Ulna and fibula relatively long and narrow. Carpus 

 with 4 proximal and 3 distal bones. 



P. cliduchus was separated mainly on the rugosity of the vertebrae, 

 a character which is well marked in the type of the present species. 



Hob. Europe (England). 



22656. Slab showing the ventral aspect of a nearly entire skeleton, 

 (Fig.) in a somewhat disjointed condition ; from the Lower Lias 

 of Lyme-Begis, Dorsetshire. The type specimen : dis- 

 covered in 1823, and formerly in the collection of the 

 Duke of Buckingham. Described and figured by Cony- 

 beare in the ' Trans. GeoL Soc' ser. 2, vol. i. p. 381, 

 pi. xlviii.; and noticed by Owen in his ' Liassic Beptilia,' 

 Sauropterygia (Mon. Pal. Soc. 1865), p. 1. The skull is 

 somewhat damaged. The vertebrae show distinct rugosities 

 at the borders of the centra, and also the double costal 

 facets. The pectoral girdle is wanting, but the pelvis is 

 in good preservation. The left pectoral and the right 

 pelvic limb are nearly entire. The postaxial bone of the 

 proximal row of the carpus shown in Conybeare's figure is 

 now wanting. Purchased, 1848. 



R. 1313. Slab showing the nearly entire skeleton of a somewhat 

 (Fig.) larger individual ; from Lyme-Begis. Figured by Buck- 

 land in his ' Geology and Mineralogy ' (Bridgewater 

 Treatise), pi. xvi. fig. 2, and noticed by Owen, loc. cit. 

 The skull is seen from the ventral aspect, and exhibits 

 the entire mandible and the broken palatal region of the 

 cranium. The anterior cervical vertebrae are thrown out 

 of place, but the later ones are in apposition and seen 

 from the left side. The dorsal and caudal regions are 

 seen from the right side. The right paddles are nearfy 

 entire ; in the pectoral limb the postaxial proximal carpal 

 is visible, although it is omitted from Bucklaud's figure. 

 Small portions of the pectoral and pelvic girdles are visible. 

 The vertebrae are distinctly rugose, and they appear to 

 agree precisely with those of the imperfect vertebral 

 column figured by Seeley in the ' Ann. Mag. Nat. Hist.' 

 ser. 3, vol. xvi. pi. xv., under the name of P. cliduchus. 



No history. — In Museum before 1832. 



