720 Proceedings of the Royal Society of Edinburgh. [Sess. 
The radio-ulnar epiphyses, though ossified, are not fused with the shafts of 
their bones. 
All the illustrations, with the exception of fig. 3, are from photographs 
of the specimens made in the Anatomical Department of the University by 
the Museum assistants, Mr Ernest Henderson and Mr William Gill, to 
whom I would express my indebtedness. 
For convenience of reference the lettering of the figures is as follows : — 
R, radius ; U, ulna ; r, radiale ; i, intermedium ; u, ulnare ; c, with arabic 
numerals disto-carpalia ; the roman numerals are the metacarpals ; C, the os 
centrale ; P, pollex ; r p, the pisiform element. 
INDEX. 
PAGE 
Mesoplodon bidens , Sowerby’s whale, ...... 687-720 
Morphology of manus in Hyperoodon and in the Delpliinidpe, . . . 697 
Hyperoodon rostratus , ......... 698 
Delphinidse, .......... 700 
Delphinus delphis, common dolphin, ....... 700 
„ acutus , white-sided dolphin, . . . . . . .702 
Lagenorynchus albirostris , white-beaked dolphin, . . . . .703 
Pliocoena communis , common porpoise, . . . . . .705 
Globicephalus melas, pilot whale, . . . . . . .707 
Grampus gfiseus , Risso’s dolphin, . . . . . . .709 
Delphinapterus leucas, Beluga or white whale, . . . . . .711 
Monodon monoceros, Narwhal, . . . . . . . .712 
Morphological Summary, . . . . . . . .715 
{Issued separately October 14, 1909.) 
