Holland : Crocodile From Montana. 



291 



scutes which are so heavy and massive as these. The smaller scutes 

 are some of them almost hemispherical and a few of the smallest 

 almost spherical in form, causing them thus to differ widely in appear- 

 ance from those of other crocodilian scutes. This character is re- 

 garded by the writer as possessing generic value. 



On the upper surface all of the scutes are deeply pitted on either 

 side of the median longitudinal ridge, the pits being often confluent. 

 The median ridge is also in almost all cases marked by a few narrow 

 but deep circular pits. On the under side the scutes are slightly 



WM& 



Fig. 15. Dorsal scute (- 9 r G i 3 )' 

 About i nat. size. 



Pig. 16. Sacro-caudal scute (- 9 T 6 g 3 -). 

 I, superior view ; 2, left lateral view; 

 3, posterior view ; a, front ; b, back. 

 About \ nat. size. 



rounded at their edges in the case of the larger specimens, and 

 quite rounded in the cases of the smaller specimens. They 

 show on the under surface numerous fine straight lines decussating 

 with each other at an angle of about forty-five degrees, indicating the 

 structure of the dermal tissues in which they were imbedded and to 

 which they adhered.* On the anterior margin many of the scutes 

 show bevelled margins to adapt them to union with the scutes which 

 preceded them and evidently somewhat overlapped them in front. 



Dimensions of Scutes. 

 Cervical Scute. (See Figs. 9 and 10.) 



(Carnegie Museum Cat. Vert. Foss. No. W 3 -. ) 



Antero-posterior diameter ill mm. 



Transverse diameter 143 " 



Greatest vertical diameter 58 " 



*Sir Richard Owen (Report of the British Association for the Advancement of 

 Science, nth meeting, 1841, p. 71) calls attention to a similar feature in the scutes 

 of Goniopholis crassidens Owen. 



