PLESI0SATJKIDJE, 



153 



length of this specimen is 0,572 (23 inches). The undermentioned 

 vertebrae agree in relative size with this femur, and in generic 

 characters with those of the type species. 

 Hal. Europe (England). 



R. 1413. Cast of an imperfect cervical vertebra, probably from the 

 middle region of the neck. The original was obtained 

 from the Kimeridge Clay of Ely, Cambridgeshire, and is 

 preserved in the Woodwardian Museum, Cambridge 

 (No. ^ 6 ). It is referred to on p. 99 of Seeley's ' Index to 

 Aves &c. in Cambridge Museum ' as one of the types of 

 Plesiosaurus sterrodirus. The specimen has lost nearly 

 the whole of the neural arch, the whole of the left, and 

 the distal portion of the right rib. The dimensions 

 of the centrum are : — length 0,038 (1-48 inches), width 

 0,078 (3-06 inches), height 0,057 (2-3 inches); these 

 according fairly well in relative size with the type femur. 

 The terminal faces are . nearly flat ; and the rib is anchy- 

 losed to the centrum, although the line of suture is visible. 

 In an associated "pectoral" vertebra in the Cambridge 

 Museum (No. ^) the centrum is relatively longer, with 

 more concave terminal faces ; its dimensions being length 

 0,048 (1-87 inches), width 0,082 (3-21 inches), height 

 0,061 (2*4 inches). In general characters this specimen 

 agrees with the figured " pectoral " or lumbar of P.philar- 

 chus (No. E. 1253), with the exception that, as in the 

 cervicals, the base of the neural canal is sunk into the 

 centrum, which has somewhat more concave faces ; the 

 dimensions of the centrum of that specimen are : — length 

 0,040 (1-55 inches), width 0,072 (2-85 inches), height 

 0,058 (2*25 inches). Made hi the Museum, 1888. 



47325. The right (?) ischium ; from the Kimeridge Clay (Upper 

 (Fi(/.) Jurassic) of Swindon, Wiltshire. This specimen (wood- 

 cut fig. 51) agrees precisely with the ischia of P. philar- 

 chus in the collection of A. N. Leeds, Esq., of Eyebury, 

 Peterborough. It dimensions are: — length 0,450 (10 

 inches), width at proximal extremity 0,261 (10-5 inches). 

 It is noticed by the writer in the ' Quart. Journ. Geol. 

 Soc' vol. xlv. p. 52. 



Presented btj the Directors of the Swindon 

 Biiclc and Tile Company, 1876. 



R. 1255. A left femur probably referable to this species; from the 

 Kimeridge Clay of Broughton-Gifford, Wiltshire. The 



