140 



MAEINE EEPTILES OF THE OXFOED CLAY. 



larger ; the two are separated by a well-marked oblique groove (i.c.g.) running from 

 front to back of the bone. The plane of the distal condyles makes an angle with that 

 of the proximal expansion, but is not turned almost at right angles with it as in 

 Steneosaurus. There is a well-marked deltoid prominence (d.c.). The humerus in 

 this genus is longer than the tibia and more than half as long as the femur: in 

 Steneosaurus the reverse is the case. The radius and ulna, though similar to those of 



Test-fig. 54. 



i.cg. 



Left humerus and left half of shoulder-girdle of Mycterosuclius nasutas : A, humerus from front : 



B, distal end of humerus ; 0, outer side of coracoid and scapula. (R. 2617, g nat. size.) 



c.e., radial condyle ; c.i., ulnar condyle ; cor., coracoid ; d.c, deltoid crest ; /., coracoid foramen : 



gl.f., glenoid fossa; h., head of humerus ; i.c.g., intercondylar groove ; sc, scapula. 



Steneosaurus in form, are likewise proportionately larger. The difference of proportion 

 between the fore and hind limb may be expressed by saying, that if the combined 



