NOTES ON THE SALMO SALAR SPECIMEN — MORROW. 163 



16 <$c 17. Between the points of these spinous rays* is the 5th 

 intersp. fin bone, and at the 17th begins the shortening or hol- 

 low in the sp. rays for the insertion of the dorsal fin. 



17 & 18. Between 17 and 18 is the 6th intersp. fin bone. 



19. Opposite the point of 19, perhaps slightly in front, is the 



7th intersp. fin bone. 



19 & 20. Between 19 and 20 is the 8th intersp. fin bone. 



21. Nearly opposite the point of 21, slightly in advance of it, 

 is the 9th intersp. fin bone. 



22. Nearly opposite the point of 22, perhaps a little anterior, is 

 the 10th intersp. fin bone. 



22 & 23. Between these, slightly in front of 23, is the 11th. 



23 & 24. Between these, slightly in front of 24, is the 12th. 

 24-. Opposite 24 is the 13th intersp. fin bone. 



24- & 25. Between these, slightly in front of 25, is the 14th. 

 26. \ Slightly in front of 26 is the 15th intersp. fin bone ; at the 

 posterior junction of these intersp. fin bones with the fin rays, and 

 attached to the prolongation of the 15th intersp. fin bone from 

 its lower extremity, the fibrous tissue descending and attached to 

 26, 27, 28, 29, 30— the 26th, 27th, 28th, 29th and 30th spinous rays, 

 is rather stronger than that which is attached to the other sp. rays. 

 The height of the intersp. column from the centre of the vertebras, 

 at right angles to the junction of the fin raj's, is at the anterior 

 face of the dorsal fin 3J inches ; at the posterior face, 2>\ inches ; 

 length of dorsal from anterior to posterior edge is 3f inches, 

 and, including the prolongation of the 15th intersp. fin bone, 4^ 

 inches. 



29-4-2. From, and including 29 to 42, the superior caudal spin- 

 ous rays are wider at their dorsal ends than are the other dorsal 

 sp. rays ; from 26 to 42, the height of the dorsal sp. rays is nearly 

 4-2-53. equal, and from 42 to 53 they rapidly decrease in length, 

 and their dorsal ends are comparatively narrow. 

 54--55. At the point of this sp. ray begins the upper or dorsal 

 portion of the caudal fin (the ventral portion begins also at 

 the 54th). The 54th and 55th sp. rays are anchyclosed at their 



*The shortening of the spinous rays for the insertion of the dorsa! I do not find in some spe- 

 cimens of the Cape Breton Salmon. 



tThe hollow for the dorsal is here completed and the spinous rays begin to rise. 



5 



