96 



COMPAKATIVE ANATOMY. 



Dinosaurians the latter (Fig. 81,*) is more strongly developed, 

 and plainly leads towards the form of pelvis seen in Birds. 



FIG. 81. PELVIS OF Igiianodon bernissartensis. (After Dollo.) 



*, preacetabolar, and Jl, postacctabular process of the ilium ; a, acetabutnm (per- 

 forated) ; P, pars acetabularis (pectineal process of pubis) ; P l , pubis ; Js, 

 ischium. 



Fir.. 82. PELVIS OF Apleryx auslralis. (Lateral view.) (After Marsh.) 

 ?7, ilium ; is, ischium : p, pectineal process of pubis ; p 1 , pubis ; a, acetabulum. 



In Birds (Fig. <S2), both pro- and postacetabular portions of 

 the ilium are largely developed, but vary in their relative propor- 

 tions (comp. p. 44). In Crocodiles the pubis is to a great extent 



