102 G. R. Wieland—On Marine Turtles, 



Measurements of Archelon iscliyros. 



(From the type specimen.) 



The Radius. 



Meters. 



Length _ _ _ , -35 



Proximal diameters .._ _ _ -082 and •114 



Least diameters of shaft _ -05 and -067 



Distal diameters -049 and -114 



The Ulna. 



Length '33 



Greatest and least proximal diameters -093 and -14 



" " ** diameters of shaft -054 and -063 



" " " distal diameters -088 and -138 



Measurements of carpals and metacarpals, viewed from dorsal 

 surfaces : 



Greatest length. Greatest width. 



Intermedium _ -8 -11 



Ulnare ._. -11 -08 



Pisiform -14 '12 



Centrale _ ._ -048 -06 



Carpale I -04 -07 



II.. — — 



" III-. -06 -056 



" IV „_ -068 -068 



" Y . -06 '072 



Metacarpale I -09 -10 



'' V... -156 -056 



The extreme length of the accompanying humerus is -Qb meters. 



III. The Cervicals of Toxochelys and Archelon. 



(See Measurements, p. 98.) 



The cervical formula has not hitlierto been given for any of 

 the Cretaceous marine turtles, so far as the writer is aware, 

 our knowledge having been restricted to scattering or isolated 

 vertebrae. I may hence give the formula for Toxochelys^ and 

 will show that that of Archelon may also be determined as 

 quite similar, since we know the vertebrae most susceptible of 

 change, the last three. 



In the Yale specimen of Toxochelys (see Measurements), 

 the first, second, fourth, sixth, seventh, and eighth cervical 

 vertebrae are present. The nature of the other two, the third 

 and the fifth, of course follows, as included arbitrarily in the 

 subjoined table, in which are 2:iven the formulae for the 

 present forms and several others presenting interesting or im- 



