490 Dr. 0. W. Andrews on a Crocodile 



posteriorly in a thickened point ; but this region is hidden 

 by overlying bones. An interclavicle of somewhat similar 

 shape, though probably having a shorter extension in front 

 of the coracoids, lias been described (as sternum) in Mystrio- 

 saurus by d'Alton and Burmeister*, but I am not aware that 

 it lias been noticed in later Mesozoic forms. 



The humerus is closely similar to that of modern crocodiles, 

 except that the distal condyles are more nearly equal in size. 

 In this respect the present species also differs widely from 

 Steneosaurus and Metriorhynclius, in which the ulnar condyle 

 tends to undergo extreme reduction. The uluai are not well 

 enough preserved to show any characters. 



Of the pelvis an ilium and an ischium are preserved. The 

 ilium, of which the upper part of the inner face is exposed, 

 does not seem to differ from the modern type. The ischium 

 is nearly concealed by other bones. 



Of the hind limb only a right tibia and a left fibula are 

 preserved. The tibia is somewhat incomplete distally and is 

 crushed at its upper end. So far as can be seen it is like that 

 of recent crocodiles^ and the same may be said of the un- 

 crushed and perfect fibula, except that the distal facets for 

 the astragalus and calcaneum seem to be more sharply marked 

 off from one another. 



Both dorsal (PI. VIII. fig. 2) and ventral scutes are pre- 

 served. Of tiie former there were no doubt two rows 

 meeting in the middle line. Each dorsal scute (Pi. VIII. 

 fio-, 2) is much broader transversely than longitudinally, the 

 ratio being about 11 to 4. The anterior border (a.6.) is 

 smootli and separated from the posterior portion by a groove ; 

 this smooth portion is overlapped by the hinder border of 

 the scute in front ; the outer anteiior angle is produced 

 into a blunt process (/>•)> which also underlies the scute 

 in front. The greater portion of the surface is covered 

 with an irregular sculpture of scattered pits, which become 

 most numerous and deepest towards the outer border, near 

 which there is a blunt longitudinal keel. The posterior 

 border of the under surface is bevelled off to fit against the 

 corresponding facet or the scute behind. 



The ventral scutes united to form a plastron ; they are 

 polygonal, those in the middle of the plastron having six 

 irregular sides. The sculpture of pits is much more strongly 

 developed than on the dorsal scutes. 



* ' Der Fossile Gavial von Boll ' (1854), p. 65, pi. ix, (in the lettering 

 of the plate thia bone is wrongly marked " coracoid ";. Also probably the 

 bone marked c in pi. vii. 



