THE ADIPOSE LOBE OF THE PELVIC FIN OF THE SALMON. 723 
(5) So far as present observ^ations go, the development of 
the accessory scale into an adipose lobe, possessing a skeletal 
connection with the ventral fin, is confined to the genns 
Salmo . 
(1) Range of Fishes in which Scale has been 
Figured. 
The following list of fishes in which the accessory scale is 
pi’esent is by no means complete, but will serve to indicate 
the wide range of its occurrence. I have not stated the 
groups from which it is absent unless I have actually 
observed this. 
Sub-order — Malacopterygii. 
Famil}'^ Elopidse 
Hyodoutidae 
Albulida) 
Goiiorbynchidse 
Clupeidae 
Salmonidaj . 
Elops saxirus. Ox. 387, J. & E. 178. 
Megalops atlanticus. .T. & E. 177, 
Camb. 547. 
Hyodon tergisus. J. & E. 180. 
H. selenops. J. & E. 181. 
Albula eonorhyiiclius. Camb. 548. 
Gonorliyiichus greyi. Ox. 395. 
None observed without. 
Present in all genera except Osmerus, 
Thaleichthys, Mallotiis and 
Hypomesiis, which Boulenger re- 
gards as together forming a natural 
groiip. In Salmo is enveloped in 
connective tissue and largely sur- 
rounded by fat. 
Sub-order — Ostariophysi . 
CharacinidsD . Hydrocyou goliath. Camb. 578. 
Cyprinida; . . Carpiodes cyprinus. J. & E. 71. 
Cyprinus carpio. Ox. 376. 
Labeo falcifer. Camb. 583. 
‘ The I’efereuces to figures are as follows. J. & E. : Jordan and Ever- 
niann, ‘ Fishes of North and Middle America,’ vol. iv (plates), plate 
number. Camb.: ‘Cambridge Natural History — Fishes, ’page number. 
Ox. : ‘ A Treatise on Zoology,’ pt. 9, Oxford, page number. 
