NOTES ON SALMO SALAR SPECIMEN—MORROW. 185 
The clavicle from its inferior edge to the extremity of its ante- 
vior horn is in this specimen :—2i inches in height; 3: inches in 
length, from posterior to anterior end, and measured on a line 
through its centre; the inter-clavicle is attached to it for about 14 
inches, measured from the top of its anterior horn, and the shape 
of its superior extremity nearly corresponds to that of the 
inferior extremity of the inter-clavicle; on its inner side, near its 
posterior edge, there is slightly projecting from it a thin 
bony plate, terminating at the lower edge of the clavicle to 
which it is anchylosed, it has a narrow rounded end, this 
unites with the posterior edge of the accessary bone—its lower 
rounded end is close to it. The accessary bone arises about 
midway on the posterior edge of the clavicle, at the junction of 
the division of its thin posterior plates, and is anchylosed with 
it; it becomes gradually thicker for nearly one-third of its length 
and then decreases to its inferior end where it has the usual en- 
largement for its attachment to the strong muscular tissue in 
this part of the fish, its interior edge projects 1} inches below 
the clavicle, and its posterior edge {of an inch. This accessary 
bone passes laside of the pectoral fin, and gives support to it; 
it is entirely different from that of the cod-fish in shape as well 
as attachment. In the cod, as you will see by the specimen 
(pectoral fin, clavicle, etc., shown), it is a free bone, lying loosely 
upon the upper posterior edge of the clavicle. 
The scapula joins at its superior extremity the upper edge of 
the clavicle, and its inferior extremity the upper posterior divi- 
sion of the coracoid bone; its pesterior inferior extremity is also 
attached by cartilage to the posterior edge of the bones, which 
represent the radius and ulna. 
The coracoid at its posterior extremity is divided. Its upper 
edge is united with the scapula, as already mentioned; its lower 
limb, which is the longest, has its point attached to the inner 
central ridge of the clavicle, and it is pierced by two foramina, 
each of considerable size, one on either edge, outer and inner, the 
latter being the largest and oval in shape; the posterior edge of 
this lower limb is united by a band of very thin bone, which fol- 
jows on the one side its shape, and on the other the outline of 
