70 THE UNIVERSITY SCIENCE BULLETIN. 



of the carpals is regarded as the centrale. It is in the form of a 

 rounded triangle. Its measurements are: 



Greatest breadth 50 mm. 



Least breadth 44 mm. 



Thickness 20 mm. 



The smallest carpal element is rounded, measuring 27 mm. in 

 diameter. 



The phalanges (plate 11) vary in shape. There are twenty-three 

 preserved. One or more of them may be modified carpals, but 

 they are indistinguishable from phalanges. The broadest phalanx 

 measures 29 mm. Its shaft is marked by a prominent pit which 

 leads into a medullary cavity similar to that of the femur. 



Breadth of the smallest carpal 0.028 m. 



Breadth of the largest carpal 0.050 m. 



Length of the largest carpal 0.041 m. 



The first phalanx has a medullary cavity filled with calcite. 

 From this cavity canals lead to the upper and lower surfaces, as 

 in the humerus. The ends exhibit surfaces which were apparently 

 covered with a richly vascular cartilage. It is quite evident that 

 all of the carpal elements were embedded in a mass of cartilage 

 and that possibly this cartilage included the ends of the proximal 

 phalanges. 



The phalanges of the second, third, fourth and fifth digits con- 

 sist of cylindrical elements, with thickened ends. 



Measurements of the Metacarpals and Phalanges. 



Length of metacarpal 1 0.033 m. 



Length of phalanx I of digit 1 0.032 m. 



Length of metacarpal 1 0.035 m. 



Length of smallest phalanx in the first digit 0.020 m. 



The pelvic girdle is represented by an incomplete pubis (plate 

 IV, fig. 4) and an ilium belonging to the right side. The ilium is a 

 slender, smooth, somewhat crushed bone, with expanded distal 

 articular surfaces. The median portion of the ilium is somewhat 

 constricted. At the proximal ends it is obliquely expanded for 

 articulation with the sacral rib. The distal end is rounded, and 

 is marked by numerous small vascular pits and canals. The 

 ilium, like the humerus, is marked by the teeth of some Cretaceous 

 fish. 



