KV II. 11. SCOTT ANH OLIVE B. LORD. 



Comparative Arm Bones. 



Measurement applied comparatively to two animals in 

 diffen jfes of growth does not, always, convey to the 



mind the real differences existing between their skeletons 

 in. this conm i bion weight is o tost useful aid. 



The outline of a bon i □ ry close to the size attaint d 



at maturity, and yet th< amount < t ossi posit- 



ed in that bono may be far below the quantity found 

 in a similar bone taken from a fully matured animal. 

 Tli humerus of the adult male dolphin, ab< . turns 



:ii a ki 55 grammes, while the same bom from the arm 

 of the immature animal only weighs 28 grammes ! This 



ore fully the real skeletal departure, than t In- 

 minus of live mm. does, upon total (comparatrv 

 Comparative weights often r veal 



skulls that upon measurement alone would be relegated to 

 thi common standard of at, or about the same age.* : 

 Naturally the general condition of the skull has to be 

 jidered, and the weight standard is onlv 

 absolutely a test when both specimens weighed have 



sactly the .same throughout, as in the present 

 ace, with the humeri, where both wen 1 and 



under a common series of conditions. 



Ear Boi 



The ear bones of immature dolphins of over two 

 thirds tho adult, minimum age of maturity, an practically 

 as highly developed as those of their seniors — which 

 means, that these atrophied sense capsules grow little, or 

 not at all, after the period named. Ear bones of n 

 and females, manifest individual, and it may yet be shown 

 sex variations, that would be called into determinative 

 requisition if found fossil. An extensive range of speci- 



- all correctly sexed, and aged, would yield some 

 interesting data here. Ear bones of the genus Velphinus, 

 can bo separated from those of Globicephalus, by the less 

 production of the tympanic, at its anterior articular end. 

 Again, they can be separated from the Beaked whales, of 



