Manchester Memoirs, Vol. liv. (1909), No. 4. 9 



bones appear to be identical with those of the Manchester 

 specimen. 



I cannot believe that the two specimens belong to 

 different species, and am inclined to attribute their 

 differences to a difference in sex. 



I propose to describe the girdle of the Manchester 

 specimen first, and should state that the restoration here 

 given was made before I had studied the York skeleton. 



Fig. II. V€'iS\c Qiix^t o{ Microcleidus Jionialospondyhis ; 

 lacking ilia. Viewed from the dorsal aspect, x \. Dotted 

 lines shew the existing fragments of the pubes. L. ^o"]"]. 



Pubis. The pubis is a thin plate of bone whose edges 

 are not well preserved. It meets its fellow of the opposite 

 side in a long median symphysis. It is thickest at the 

 acetabular end, where at the maximum it reaches 5 cm. 

 This end presents the usual two facets, which, however, 

 are not very distinct, for articulation with the ischium and 



