54 



POLYPTYCHODON INTERRUPTUS. 

 Oiven, Odontography^ pi. 72, fig. 4 (1841). 

 a. Cro^vn of tooth ; from the Cambridge Greensand. 



CIMOLIOSAURUS TROCHANTERIUS. 

 Plesiosaurus trochanterius, Owen, Rep. Brit. Assoc, for 1839, 

 p. 85 (1840). 



a. The centrum of a middle cervical vertebra ; from the Lower 

 Greensand bone-bed of Potton, Bedfordshire. Presented by Nor- 

 man Moore, Esq. 



CIMOLIOSAURUS, sp. 

 a. Two specimens of the humerus ; from the Cambridge Green- 

 sand. 



PLESIOSAURUS DOLICHODIRUS. 

 Conybeare, Trans. GeoL Soc, ser. 3, vol. I, p. 389 (1824). 

 a. Slab showing the skeleton, wanting the lumbar and caudal 

 regions ; from the Lower Lias of Lyme-Eegis, Dorsetshire. The 

 palate of the skull is exposed, the cervical vertebrae are scattered, 

 and those of the dorsal region seen from the left side. The right 

 scapula and left coracoid are entire. 



PLESIOSAURUS HAWKINS I 

 Oiven, Rep. Brit. Assoc, for 1839, p. 57 (1840). 

 a. Cast of slab showing ventral aspect of immature skeleton. 

 Original (type) in British Museum (No. 2018*); from Lower 

 Lias of Street, Somersetshire. 



PLESIOSAURUS MACROCEPHALUS. 

 Owen, Rep. Brit. Assoc, for 1839, p. 62, (1840). 

 a. Cast of slab with skeleton of immature individual. Original 

 (type) in British Museum (No. K. 1336); from Lower Lias of 

 Lyme-Eegis, Dorsetshire. 



