NOTES ON THE SALMO SALAR SPECIMEN—MORROW. 181 
tached to the pelvic bones by fibrous tissue and has a curved ter- 
mination: on the dorsal aspect it curves strongly, forming a double 
heel each 5 of an inch in length. The dorsal aspect is strongly at- 
tached by fibrous tissue to the outer head of the pelvic bone; and 
the inner heel is also embraced in similar attachment, together 
with the flat bony root of the ventral appendage (“axillary scale” 
of Dr. Gilpin,) from the outer side of which passes a muscle into 
the general muscular tissue. From the outer heel a strong mus- 
cle is attached passing in the same way. It may here be men- 
tioned that there is a strong band of muscular fibre passing 
forward from the ventral appendage, which, with its other mus- 
cular attachments, causes these appendages, when the ventral fins 
are in inotion, to pass under them so as to protect the hollow 
which appears at the root of the ventral fin, preventing the lodg- 
ment of any floating material, such as sawdust or chips in what 
must be a sensitive part. As soon as the ventral fins are at rest 
these appendages withdraw themselves and lie parallel with. 
their outer edge. | 
Dorsal aspect ventral : 
ist. The first ray measured in a straight 
line from heel to extremity is 32 inches in length.. 
2nd. “ second “ es i Se nee oest « 
rae urd: »“ i Meats yn « 
4th. or roustuh. : 5 or ase: << 
Sih. a fitth: |.“ “ 5S cee rine e 
6th. S sixth “ & Seat ves ‘s 
7th. “ seventh“ ie f pumlsaci es « 
crowded. 
Sth. “ eighth “ fs Ses Tt gs 
The heel of the eighth is not like those of the previously 
mentioned rays, as its anterior end is very slightly raised 
towards the dorsal aspect, and slightly curved in opposition to 
the heels of the other rays; it passes very close to, and almost 
under the heel of No. 7 and near to the pelvic bone. 
9th. The ninth ray has no heel on the dorsal side, but it has a 
slight upward curve in its line of direction tending towards the 
other rays, its length is 1i inches, its anterior extremity passes 
