NOTES ON THE SALMO SALAR SPECIMEN.—MORROW. 175 
10. The 10th short ray is nearly straight. Between ten and 
eleven, attached to the upper edge of the 11th short fin-ray, at 
about 1} inches from its inferior end is an extra bone 3 of an 
inch in length. . 
11. This ray is nearly straight, curving at its outer end to follow 
the shape of the long rays; it has a very thin pointed ventral 
end; its length is two and a half inches. 
The first shops fin-ray is about ,3 of an inch long. 
The eleventh short fin-ray is sone two and a half inches long. 
The caudal fin has nineteen long or perfect rays, (their inser- 
tion in this specimen will average about one inch in length,) which 
begin to divide or split up into a great number of fin rays, short- 
ly after the exit of the tail from its root or body of the tish. The 
first and second rays counting from the dorsal region are exactly 
opposite to the centre of the elevation of the spinal column, so 
that there are seventeen whole rays beneath it. 
1to8. The first eight rays are closely united by strong fatty 
tissue to their emergence from the integument. 
& to 9. Between the inferior ends of eight and nine there is a 
space of irregular outline filled with fatty tissue which extends 
some distance between these rays, at its widest part it measures 
15 Of an inch. 
9&4 10. The inferior extremities of these rays meet for 2 of an 
inch and are then separated for about 3 of an inch.* 
10 & 11. Are separated at their een ends. 
11 & 12. do. do. do. 
The 9th, 10th, 11th & 12th rays are broader on their inserted 
ends by cartilaginous matter, than are the other rays. 
124 13. The inserted ends of 12 and 13 join for about a quarter 
of an inch, but are then widely separate, and the ray thirteen is 
inserted into the root of the ee an eighth of an inch more than 
twelve. 
All the spaces enumerated above, beginning between eight 
and nine and continuing to that between twelve and thirteen ex- 
tend into the tail proper as a sort of web by which the tail may 
be expanded and contracted in its width. 
* 10th ray.—A line drawn through the centre of the spinal column touches this ray, the centre 
vay of the caudal fin. 
