PEOPESSOE PLOWEE ON EISSO'S DOLPHIN. 11 



is a small additional phalanx to the poUex, and one is also present in all the specimens 

 of Glohicephalus which I have examined. 



As the bones of the digits have never been separated, there can be no doubt as to their 

 correct number and position. The second digit is the largest, and has ten distinct 

 ossifications including the metacarpal, the last being a rounded nodule rather smaller 

 than a pea. The third has eight ossifications ; its metacarpal is considerably longer than 

 that of the second digit ; and its proximal phalanges are rather broader, though more 

 flattened and more compressed, especially at their posterior or ulnar edge, than are those 

 of the second digit. The relative condition of the bones of these two digits thus agrees 

 rather with Gervais's figure of the limb of G. yriseus (fig. 11) than of G. rissoanus 

 (fig. 6). The fourth digit is very short, and has but three ossifications ; and the fifth is 

 rudimentary, being mostly cartilaginous, with a nodular metacarpal bone at the base. 

 The minute bone-specks represented in the terminal portion of the cartilages of these 

 last two digits in Gervais's figure of G. griseus are not present. 



The principal dimensions of the bones of the pectoral limb are as follows : — 



inohes. 



Scapula. — Height 8'0 



Breadth 11-0 



Length of acromion 2-9 



Greatest depth of acromion 1"9 



Length of coracoid process 2'5 



Length from head of humerus to tip of second finger' . . 22-5 



Length of humerus 4'4 



Length of radius 5'2 



Length of ulna 4'6 



Breadth of radius at distal extremity 2'4 



Breadth of ulna at distal extremity 1"9 



About a month after the capture of this Dolphin (viz. March 31st) Mr. Gerrard 

 gave me an opportunity of examining another specimen which he had bought at 

 Billingsgate Market ; but, as it had changed hands several times, he was unfortunately 

 not able to obtain any trustworthy account of the place of its capture, though this 

 was probably somewhere in the Channel. It was quite fresh at the time of my 

 seeing it. This was also a female, but, as the condition of the bones afterwards 

 showed, a very young animal. 



Although very different from the former in the disposition of the surface colours, the 



other characters, especially those of the skeleton and dentition, are so closely similar 



that I have little doubt of its specific identity ; and such being the case, it is within 



the bounds of probability that this might have been the identical young animal which 



' Owing to the drying and contraction of the cartilages, this must be somewhat less than in Hfe. 



c2 



