276 SAUKOPTERYGIA. 



resemble No. R. 1328, although the haemal ridge is much less 

 developed — a character which may be due to immaturity. 

 In the pectoral girdle the portion of the coracoid in advance 

 of the glenoidal facet is a fraction more than one fourth 

 the entire length of bone, whereas in P. hawMnsi the 

 former dimension is rather more than one third the length 

 of the latter. In this respect, and in the circumstance 

 that the omosternal extremity of the scapula is narrower 

 than the coracoidal, this specimen agrees with P. conyheari. 

 The omosternum is seen to have its posterior extremity 

 embraced by and passing beneath the anterior part of the 

 coracoids — a feature supporting Hulke's view that the 

 former does not represent the clavicle and inter clavicle. 



Purchased. 



Specifically undetermined specimens from the Lias, mostly 

 referable to Plesiosaurus. 



R. 1372. The crown of a tooth of medium size, in matrix ; from the 

 Lower Lias of Lyme-Eegis, Dorsetshire. No history. 



43059 a. A smaller tooth ; from Lyme-Eegis. This tooth is of the 

 * same type as the preceding. Purchased, 1871. 



43059 "b. A still smaller and specifically distinct tooth, in matrix ; 

 from Lyme-Eegis. Purchased, 1871. 



R. 1375. The conjoint atlas and axis vertebrae of a comparatively 

 small species ; from Lyme-Eegis. No history. 



39262. A series of six associated imperfect dorsal vertebrae united 

 by matrix ; from the Lower Lias of Lyme-Eegis. These 

 specimens indicate an individual agreeing approximately 

 in size with P. conyheari. Purchased. 



33285. A dorsal vertebra of similar type, wanting the neural spine 

 and transverse processes ; from Lyme-Eegis. 



Purchased, 1858. 



R. 321. A polished slab showing a longitudinal section of six dorsal 

 vertebrae of a medium-sized form ; from Lyme-Eegis. 



EnnisTcillen Collection. Purchased, 1882. 



R. 321 a. A fragment of rock which has been cut and polished to 

 exhibit a longitudinal section of three dorsal vertebrae 

 agreeing approximately in size with No. 33285. 



EnnisTcillen Collection. 



