186 NOTES ON THE SALMO SALAR SPECIMEN—MORROW. 
the two nearly circular bones which represent the radius and ulne. 
The anterior extremity of the coracoid is somewhat twisted, that 
is, its inner and superior edge rises for its. union by cartilage with 
the clavicle, which sends out from its central ridge a flat process: 
for this purpose. 
The Humerus. 
If you will look at the under side of the coracoid bone, which 
on this aspect appears to be nearly flat and somewhat curved, 
from its posterior extremity to its junction with the clavicle ; 
between the foramina already noticed you will perceive a central 
ridge, which expands towards its posterior extremity; about 
midway of its length there appears to be a transverse joining, or 
sympbysis, and following this ridge posteriorly you will see that 
one edge of it forms the outer side of the inner foramen, and that 
there is a line or indentation which passes by the edge of the 
outer foramen to the transverse division from whence we started, 
this appears to me to be, without doubt, the humerus, but to be 
positive on this point requires the examination of very young 
specimens of the salmon, which I regret to say my sight will not. 
permit ine to undertake. 
Carpal Bones and Pectoral Fin. 
The pectoral fin is attached to four ossicles, or carpal bones,, 
with the exception of the upper or long ray, which is directly 
articulated with the radius—the upper one of these ossicles and 
the shortest is attached to the ulna; the three lower to the pos- 
terior extremity of the coracoid, at the lower part of the bone 
which I regard as the humerus—all cartilaginously. The lower 
ossicle is i, the upper about % of an inch in length. 
The rays of the pectoral fin are fourteen in number. The 
first or upper ray is in length, from attachment to posterior 
extremity or point, 4% inches, the others gradually decreasing in 
length until the lowest and shortest is 1 inches. Looking 
at the fin on either side the rays are crowded, and set one 
within the other after the manner of a venetian blind when 
turned to keep out the rays of the sun, the inner inferior margin 
being the lowest. The upper or long ray, at its attached extre- 
mity is very much stronger than the others, and at this point it 
