114 



MAEINE EEPTILES OF THE OXEOED CLAT. 



and others similarly situated, as new ossifications in the postaxial cartilage, and in 

 many cases he is probably right; he proposes the name "first epipodial supernumerary" 

 for the bone here regarded as pisiform. All the three usual bones of the proximal 

 row of carpals are flat polygonal elements, which, when fully ossified, fit closely 

 together as well as against the radius and ulna and the distal carpals, making with 

 them a close pavement. The radiale (^rad.) unites with the radius, intermedium (int.), 

 and the first and second distal carpals. The intermedium [int.] has a small surface for 

 union with the radius and a long one for the ulna; it also joins the radiale, ulnare, 

 and the second and third distal carpals. The ulnare (uln.) unites proximally with the 

 ulna and pisiform (if present) ; it also articulates with the intermedium, the third 

 distal carpal, and the fifth metacarpal. The distal carpals appear to be only three in 



Text-fis. 64. 



Pelvis of Noihosaurus sp., from left side, showing the union of the ilium, ischium, and pubis 

 in a triradiate suture to form the acetabulum. (3S675, | nat. size.) 



acet., acetabulum ; il., ilium ; is., ischium ; p.f., pubic foramen ; pit., pubis. 



number, the fifth metacarpal, as already noted, articulating directly with the ulnare. 

 They are polygonal bones, somewhat smaller than the proximal row ; the first carries 

 the first digit only, the second the second and third digits, although in some cases there 

 may be a slight contact also with the first. The third distal carpal carries the fourth digit, 

 and on its outer (postaxial) side it has a surface for contact with the preaxial face of 

 the metacarpal of the fifth digit. 



The metacarpals in some cases are flattened like the carpals, but, as a rule, are 

 somewhat cylindrical and larger at the ends than in the middle. In addition to their 

 surfaces for union with the carpals they often have at their proximal ends small 



