1128 



CLASS REPTILIA. 



latter) the humerus (fig. 1033) and femur have a prominent troch- 

 anteric ridge, and in both they articulate distally with three distinct 

 bones (figs. 1033-34), which in the pectoral limb are correlated 



Fig. 1031. — Ventral aspect of the right pectoral limb (wanting the marginal rows) of Ichthyo- 

 saurus intermedins ; from the Lower Lias of Gloucestershire. Reduced. T, Radius ; F, 

 Ulna ; t, Radiale ; i, Intermedium ; /, Ulnare ; ci, C2, Centralia. (After Hawkins and 

 Hulke.) 



by Dr Baur with the radius, ulna, and pisiform ; the correspond- 

 ing bones in the pelvic limb (fig. 1034) being the tibia, fibula, and 

 the homologue of the pisiform. The clavicles differ from those of 

 Ichthyosaurus in being separate. Both limbs appear to have been 



