OF THE CHINESE WHITE DOLPHIN. 159 
The following are the principal dimensions of the pectoral limb :— 
inches. 
meapriaretersnhes: ee it Re brite on) yeas oe i Ge 
Preaiti oe wesf. -coxiaton Me wag ren BO 
Menoth ot aeromemes 2h: 9; 2) a 8 pe jae 20 
Greatest depth of acromion «=... .9... «.. ad 
Length of coracoid process . ..... . 1-4 
Length from head of humerus to tipoffin. . . . . . 13 0 
Greaesmemeadth Ofte. ey eo oe es eae POD 
Peter taror Memes, Lag ve tetas Gib css 6s Ao wegen g 2D 
ereatmoirieien 9G 2 Wee ok pe se oe Oe 
Length ofulna. . . ne 2™ Wan Ps) Rel a Wms 
Breadth of radius at dufal icteennty PSS Re Fig k G20 
Breadth of ulna at distalextremity . ........ 18 
The principal differences between this skeleton and that of all other known Dolphins 
lie in the vertebral column. The total number of vertebre is less, the individual vertebree 
are proportionally longer, and their transverse processes are shorter and broader than in 
any other species. Next to it in these characters stands D. guianensis (genus Sotalia, 
Gray), which has the following vertebral formula:—C. 7, D. 12, L. 14, C. 22=55; then 
D. tursio, which has C. 7, D. 13, L.17, C. 25=62. D. delphis, with C. 7, D. 13, L. 24, 
C. 31=75, is at the other extreme, being only exceeded in number of vertebrae, and 
length and narrowness of the processes by the Lagenorhynchi. 
If the osteological characters possessed by this specimen be found to exist in other 
Dolphins with narrow, compressed beaks and long mandibular symphyses, Steno will be 
established as a natural group of generic value. 
DESCRIPTION OF THE PLATES. 
PLATE XVII. 
Fig. 1. Side view of the skeleton of Delphinus sinensis, presented by Mr. Swinhoe to the 
Museum of the Royal College of Surgeons: one-fourth of the natural size. 
Fig. 2. Dorsal view of the same skeleton, without the pectoral limbs. 
VOL. VII.—PaRT 11. Jan. 1870. Z 
