NOTES ON THE SALMO SALAR SPECIMEN—MORROW. 183 
pelvic bones. The bony plates to which are attached the ven- 
tral fins, together with the fins are usually called the pelvic 
limbs, but it appears to me there can be little doubt that the so 
called pelvic bones with the fins are the representatives of the 
hind legs of mammals, thus : 
The saddle bones and the bone with the cup shaped orifices 
below them, are the pelvic bones. 
The centra without spinous processes, the sacral vertebree. 
The large hypural bone, the femur. 
The pelvic bones, or the bony plates to which the fins are at- 
tached ; the tibia and fibula and the ventral fins generally the 
feet. 
The Shoulder girdle and Pectoral fins. 
At the junction of the body with the head under the opercular 
plate, appears on each side of the fish a series of bones forming 
the fore frame and support of its body, and from which spring 
at about two-thirds of their total length the pectoral fins. In the 
specimen of the salmon before you on their outer sides each set ap- 
pears primarily to be formed of three bones. Reversing these bones 
and looking at their inner surfaces there appears to be on each 
division (right and left side) another bone now anchylosed 
with the posterior edges of each middle bone or inter-clavicle, 
and throwing off from their anterior edges a thin process or 
plate, which passes partially over the lower edges of the 
supra-clavicles and united to the anterior edge of each of the 
inter-clavicles, serving as a base for the supra-clavicles and for 
the attachment of their tissues. 
Taking, 2s in the ventral fins, the shoulder-girdle, left side— 
removed from tbe body of the tish, the upper portion the supra- 
clavicle viewed from the outside has a two-fold* termination, the 
posterior fork passes freely, apparently without any ligamentous} 
attachment, into the fleshy tissue; measured in a direct line from 
base tO point it is 2{ inches in length, and its base is a little 
less than 3 of an inch in breadth. It overlaps the inter- 
clavicle; at § of an inch from its base, anteriorly, arises 
*Three-fold, if looked upon as the same bones in the cod are usually accepted. 
t1 could not find any in three specimens. 
