176 NOTES ON THE SALMO SALAR SPECIMEN — MORROW. 



13 & lip. Are close together to the beginning of the tail proper. 

 14- & IS. Are close at their inserted ends, slowly separating 

 until divided for the expanse of the tail, when they appear as. 

 close together. 



15 <Sc 16. Almost unite for one inch, they then appear as slightly- 

 separate. 



16 & 17. 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 

 2|- inches long. 



these two are nearly 

 straight and pointed at 

 either end. 



2nd. The second short ray is 2 

 inches long. 



3rd. The third short ray is If inches long ; pointed and. 

 slightly curved laterally. 



4-th. The fourth short ray is 1^ inches long ; more curved^ 

 laterally than the third. 



Sth. The fifth short ray is 1 inch long ; slightty 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-ray by the tail muscle ; they have a little more separation 

 than the dorsal short fin-rays, and are deeper than their breadth. 



Anal Jin. 



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 2f inches, 

 long, and has upon its ventral anterior surface a heart-shaped 

 shield, half an inch wide at its dorsal edge, and in depth f 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. 



