176 NOTHS ON THE SALMO SALAR SPECIMEN—MORROW. 
13 & 14. Are close together to the beginning of the tail proper. 
144615. Are close at their inserted ends, slowly separating 
until divided for the expanse of the tail, when they appear as 
close together. 
15 & 16. Almost unite for one inch, they then appear as slightly 
separate. 
16417. Inserted ends close, then very slight separation. 
17 & 18. Same as above. 
18 & 19. Close together, nineteen being the ventral ray. The 
first three outer rays of both aspects of the caudal fin, dorsal and 
ventral are very strong. 
The short rays of the caudal fin on the ventral side beginning 
at the end of the fifty-fourth spinous ray, are eleven in number 
1st. This short ray which is next ) 
the nineteenth caudal ray proper, is | these two are nearly 
2} inches long. . straight and pointed at 
2nd. The second short ray is 2 | gither end. 
inches long. 
8rd. The third short ray is 1? inches long; pointed and 
slightly curved laterally. 
4th. The fourth short ray is 1§ inches long; more curved 
laterally than the third. 
éth. The fifth short ray is 1 inch long ; slightly curved. 
6th to 11th. These are all curved more or less, and the eleventh 
is a quarter of an inch long. The points of these short rays are 
united as the spinous rays, and enveloped as the dorsal short 
fin-rays by the tail muscle; they have a little more separation 
than the dorsal short fin-rays, and are deeper than their breadth. 
Anal fin. 
The anal fin begins, or rather the anterior end of the first in- 
tersp. fin bone is attached, as before stated, to the end of the 33rd 
pair of ribs (on the 35 centrum). This intersp. bone is 23 inches 
long, and has upon its ventral anterior surface a heart-shaped 
shield, half an inch wide at its dorsal edge, and in depth 3 of an 
inch, which is attached by cartilage to the intersp. fin bone. On 
the lower face of this shield or plate is a short cartilaginous ray, 
(half an inch long) having a bony base. It has no articulation 
