CEOCODILIA. 



43 



pubis 1 directed forwards, with cartilaginous symphysis, and fre- 

 quently excluded from acetabulum ; ischium short and thick, 

 without obturator process ; femur with curved shaft, head oblique 

 to condyles, and not differentiated from tuberosities, and no inner 

 trochanter ; tibia without cnemial crest ; astragalus not flattened, 

 and distinct from tibia. A ventral dermal armour may be present ; 

 and the mandible nearly always has a lateral vacuity. Habits 

 quadrupedal and subaquatic ; feet plantigrade . 



Crocodilus vulgaris. — Left side of pelvis. }. II, ilium ; pra,psa, pre- and post- 

 acetabular processes of ditto ; Is, ischium ; P., pubis ; v, acetabulum. 

 (From the 'Quart. Journ. Geol. Soc.') 



Suborder EUSUCHIA. 



Premaxillae, maxillae, aud palatines with palatal plates uniting in 

 the median line to separate the narial and oral passages ; no 

 columella ; anterior nares terminal and usually undivided ; vomers 

 generally invisible on palate ; no distinct postfrontal 2 ; middle 

 eustachian canal bony ; and premaxilla with not more than 4 or 5 

 teeth. No clavicle ; coracoid elongated, with small fontanelle ; 

 humerus without ectepicondylar groove. Pubis 3 excluded from 

 acetabulum (fig. 7) ; five digits in manus and four in pes, of which 

 three have claws. Yertebrse pro- or amphicoelous. Dorsal scutes 



1 Seeley (Proc. R. Soc. vol. xliii. p. 235 [1887]) regards the bone usually termed 

 pubis in the Eusuchia as a prepubis. 



2 See Baur, Zool. Anzeiger, No. 240 (1886). — The bone commonly termed 

 postfrontal is really the postorbital. 



3 See note 1. 



