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 f 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 motion, 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 : 

 1st. The first ray, measured in a straight 



line from heel to extremity, is 3| inches in length 



" second " •' " " 3| 



" third " " " " 3^ 



fourth 

 fifth 



I 



'¥ 



"sixth " " " " 2 \ 



"seventh" " " " 2£ 



crowded. 



" eighth " " " " 21 



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 If inches, its anterior extremity passes 



