THE DICTNODONTIA. 



223 



Fio , 78. — Tlie pelvis and htnd-limb of, A., Drom^us ; B., an omlthoscelid reptile, such af 

 Iffitcmodon^ or RypsilopkocLon ; and C, a Crocodile. Ttie'blrd's limb is in its natural 

 position, as is tliat of the Omithoscelid, though the metatarsus of the latter may not, in 

 nature, hare been so much raised. The Crocodile's limb is purposely represented in an 

 unnatural position. In nature, the femur would be turned out nearly at right angles t^ 

 the middle rertical plane of the body, and the metatarsus would be horizontal The Tetters 

 are the same throughout. 7?, ilium ; /s, ischium ; Pb, pubis ; a, anterior process, b^ 

 posterior process, of the ilium ; TV", inner trochanter of the femur ; T^ tibia ; J*, fibula ; 

 .4.5, astragalus; Cte, calcaneum. /., /Z, ///, IV.^ the digits. 



Vni, The Oknithoscelida. — The very remarkable extinct 

 reptiles which constitute this group, present a large series of 

 modifications intermediate in structure between existing Rep 

 lilia and At^es. 



