FROM THE TERTIARY BEDS IN THE ISLAND OF BOMBAY. 3 



and radius, together with the carpal bones. The humerus and the 

 united ulna and radius (h and ur) are rather thick in proportion to their 

 length, (the former being a little longer). The carpal bones (ca) appear 

 to be only five (? 6) ; the outer one the (lunar) is the largest, the others 

 are not quite sufficiently distinctly discernible. The carpal bones give 

 support to four subequal metacarpal bones (see fig. 5), there being 

 only a trace of the thumb perceptible : the index and middle finger have, 

 as usually, two phalanges : the next finger (which is the longest) three 

 phalanges, as has also the fifth digit, though considerably shorter than 

 the last. 



The lower portion of the scapula (fig. 1, i) is broad and short ; 

 of the upper portion only the posterior subcylindrical margin is preserved ; 

 the rest does not appear to have been perfectly ossified. The clavicle and 

 coracoid (cl and co), both of which are distinctly visible in the ventral 

 view (fig. 2), run parallel and very close to each other; the former is very 

 thin, perfectly ossified and united in the pectral line, the outer ends being 

 curved forward and joining the scapula by an oblique, lateral and very 

 narrow articulation. The coracoid is more flattened and broader towards 

 each end than in the middle. Of the sternal bones nothing could be 

 seen ; they were probably not ossified. 



4. Posterior extremities. — The hind limbs each exceed the total 

 length of the body by one-third; the femur (fig. l,f) and the anchy- 

 losed tibia and fibula are two cylindrical bones, thinner in the middle 

 than towards their ends. The femur is nearly quite as long as the united 

 tibia and fibula, and their length together equals that of the vertebral 

 column. The calcaneus and astragalus {cc and a in figs. 1 and 4), the 

 latter being a very slender and twisted bone, are half as long as the tibia. 

 Of the tarsal bones (fig. 4), the cuboid (c) is transversally much elon- 

 gated and compressed ; the naviculare (n) is hardly one-third of the size of 

 the former ; then follow two bones, (ab) the one next to the cuboid being 

 much longer, the other very small ; to this last one joins a still smaller 



( 389 ) 



