COPEIA 51 



(the highest) 8.5 mm. above the level of the keel. On 

 the fourth and fifth neural, the keel approaches the 

 normal shape. Traces of the lateral keels are visible 

 on the second and third costals. 



The smaller specimen, No. 4616, with traces of 

 the "egg tooth" and of the umbilicus still present, ap- 

 pears to be the only young specimen of this species 

 on record. Hay,* in 1908, mentions none smaller 

 than 240 mm. It is much to be regretted that it is not 

 accompanied by exact data. The upper jaw of this 

 specimen is no more hooked than that of specimens 

 of C. caretta of the same size, while that of No. 2205 

 is prominently hooked. The specimen has been com- 

 pared with a series of seven young Caretta caretta. 

 Hay, (loc. cit.), speaks of the alveolar ridges as less 

 prominent in his smaller specimens, but they are suf- 

 ficiently developed in this one to be very distinct 

 from those of C. caretta. Hay also speaks of the pro- 

 portionate breadth of the carapace as greater, though 

 not distinctive; a comparison of the mean measure- 

 ments of a series of both species might, however, show 

 a valid difference in this character. The measure- 

 ments of the present specimens, together with those 

 of the young C. caretta for comparison, are tabulated 

 below. 



The "carapace and plastron" of C. kempi from 

 the American Museum referred to by Hay (loc. cit.) 

 were not found. 



*Proc. U. S. National Museum, Vol. 34, 1908, p. 185. 



