THE ADIPOSE LOBE OP THE PELVIC FIN OF THE SALMON, 703 
An Account of the Anatomy and Homology of 
the Adipose Lobe of the Pelvic Fin of the 
Salmon. 
By 
Edward W. Sliaiin, B.Sc., 
Demonstrator and Assistant Lecturer in Zoology in the Victoria 
University of Manchester. 
With Plate 43 and 3 Text-figures. 
Contents. 
PAGE 
I. Introductory . . . . 703 
II. Details op the Anatomy of the Pelvic Fin and of 
ITS Adipose Lobe .... 706 
III. The Development of the Adipose Lobe . . 718 
IV. Observations from Other Teleostei . . 722 
V. Homology and Function .... 727 
I. Introductory. 
During the past two years the Zoological Department in 
ilanchester University has been in receipt of fresh salmon, 
mainly from the Wye, which have been sent for the purpose of 
age determination by means of scale-markings. In December 
last Professor Hickson called my attention to the presence of 
a fleshy lobe lying immediately above the pelvic fin of a 
large female specimen. As we did not then know whether 
this growth was normal, and, if normal, whether it was con- 
fined to female specimens, I undertook to investigate the 
question ; the investigation has not only proved exceedingly 
