Manchester Memoirs^ Vol. liv. ( 1 909), No. 4. 11 



that there is no anterior lateral process of the pubis as 

 there is in the latter genus. 



The pelvic girdles most similar to those of Micro- 

 cleidus are those oi Elasmosaiirus, as described by Cope in 

 E. platyiims, and by Williston in E. iscJiiadiaciis ; these 

 two, especially the latter, are very like my restoration, 

 although they are relatively wider. 



Fi§. III. Pelvic girdle of Microcleidus homalospondylus , dorsal surface. 

 X about \. From a photograph of the York skeleton. 



The pelvis of the York specimen is well exposed 

 from the visceral surface, and has all the bones with the 

 exception of one ilium, naturally articulated. Its arrange- 

 ment and the outlines of the various bones will be 

 understood from the figure (7V,r/-_/?^. III.), which is founded 

 on a photograph. 



