270 



REPTILIA. 



markable, because they terminate in a tri- 

 angular cartilage, analogous to that which 

 ekes out the scapula. 



Vestiges of the pelvis may be traced in 

 Ophisaurus and Anguis, under the shape of a 

 little os ilii, with a vestige of the ischium, but 

 without any symphysis. j 



The cylindrical bones of the anterior and 

 posterior extremities present nothing worthy 

 of special remark. 



The carpus (Jig. 185.) consists of nine bones, 

 the disposition of which is not unlike that of 

 the carpal bones of a monkey. In the first 

 row there is a radial bone (c), a cubital (d), 



Fig. 186. 



Fig. 187. 



Fig. 185 



Fore-leg of Crocodile. 



a, the ulna ; b, the 

 radius ; c, radial car- 

 pal bone; d, ulnar 

 carpal bone ; e, os 

 pisiforme ; /, a len- 

 ticular bone inter- 

 posed between the 

 ulnar carpal bone 

 and the metacarpal 

 bones of the three 

 inner fingers. 



Hind-leg of Crocodile. 



a, the tibia ; b, the fibula ; c, the 

 astragalus ; d, the os calcis ; e, the 

 os cuboides ; /, the cuneiform e, 

 there is a flattened triangular su- 

 pernumerary bone attached to the 

 outer side of the cuboid, which in 

 the figure has no letter of reference. 



Tarsus of Lizard. 



a, the 'tibia; b, the fibula; a', the 

 astragalus ; b', the os calcis ; c, the 

 os cuboides ; d, the cuneiforme. 



which is of large size, and an os pisiforme (<?) 

 attached to the inferior extremity of the 

 ulna. In the second row there are five small 

 bones arranged in a curvilinear form, and 

 corresponding with the five metatarsal bones : 

 the ninth (/) is interposed between the two 

 large bones of the first row, and the first, 

 second, third, and fourth of the second, form- 

 ing a kind of central piece to the carpus. 



The tarsus of lizards, like that of the croco- 

 dile, is composed of four bones only. 



The first row consists of two : one tibial (fig. 

 187, ') which is likewise slightly articulated 

 with the fibula ; the other fibular (6), of 

 smaller dimensions, which, however, soon 

 unites into a single piece with the former, 

 situated on the same plane. 



The second row likewise consists of two 



