Anatomical Structure of certain of the Cetacea. 397 



young, incisive teeth in both jaws, in addition to the tusks in the 

 upper. Of these incisives, the upper smaller or mesial ones, are 

 thrown off at an early period, 'and not replaced. The tusks are 

 probably replaced by permanent teeth. No tusks are found in 

 the lower jaw. 



As regards the other parts of the skeleton, I found, in the 

 one so often alluded to during the course of this memoir, twen- 

 ty-six cervical and dorsal vertebrae, and twenty-eight caudal. 

 The sternum is very remarkable ; but its appearance cannot be 

 altogether depended on, for this reason, that we know not how 

 the bones were originaUy prepared, nor what violence, or injury, 

 or loss, they may have sustained. That they are not quite per- 

 fect, is obvious from what I discovered had happened to the tem- 

 poral bone, where, very obviously, the knife or chisel had been 

 at work, to extract the small bones of the ear. Whether this 

 happened previous to the bones being sent from India, or merely 

 prior to their being inspected by me, I shall not take it upon me 

 to determine. The adult sternum, in a perfect state, may not as 

 yet have been seen by any anatomist. 



From the hasty glance I had of the soft parts, I will venture 

 to predict, that the arrangement of the hyoid bones, and their 

 connexion with the tongue, have been totally misunderstood ; 

 but I am unwilling to bring forward any views as to this part of 

 the animal, until another opportunity shall occur of inspecting 

 these parts. 



In the bones of the fore-arm we meet with an unexpected 

 resemblance to the elephant, in a structure hitherto deemed 

 unique. The ulna is the stronger bone at the carpal joint ; but 

 it is quite probable that this structure prevails in several pachy- 

 dermatous marine mammalia. 



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