168 NOTES ON THE SALMO SALAR SPECIMEN — MORROW. 



divergence of which will be perhaps better understood by men- 

 tioning that while it lies at an angle of abont 14° with the spinal 

 column, the ventral sp. ray springing from this centrum forms 

 its angle about 65°. 



C. 38. The spinous ray No. 36 is about If inches long (being a 

 sudden increase of length) and is free — that is, only attached by 

 tissue to the interspinous fin bones of the anal fin. It and the 

 succeeding four spinous rays have wide ventral ends for similar 

 attachment, and are of about equal length. 



G 39. The end of the 37th sp. ray has opposite its point the 

 4th intersp. bone of the anal fin. 



C. 4-0. The 38th sp. ray has opposite its anterior edge, the 5th 

 intersp. anal fin bone, and opposite its point, the 6th intersp. 

 fin bone. 



G. Jpl. Slightly in front of the 39th sp. ray is the 7th. intersp. 

 fin bone, and the 8th is opposite its point. 



G. 1$ The 40th sp. ray has opposite its centre, the 9th intersp. 

 fin bone ; and the dorsal extremity of the 10th and last intersp. 

 C. Jp3 fin bone of the anal lies exactly between this and the 41st 

 sp. ray, which is about the same length as the five preceding rays, 

 but its ventral end is somewhat narrower. 



G. 44- The 42 sp. ray.~\ The ventral extremities of these 4 spi- 



45. " 43 " I nous rays are about the same breadth 



4.6. " 44 " J as the 41st, but the tissue attaching to 



47. " 45 " J them, the posterior edge of the 10th 



intersp. fin bone of the anal, which curves posteriorly (its ventral 



end being opposite at right angles to the end of the 44th spinous 



ray, in order to afford sufficient support), is stronger than that in 



some other parts of the fish. The total depth of the skeleton at 



the anterior edge of the anal fin to the edge of the dorsal sp. rays 



is 5 inches, and at its posterior edge 3£ inches. 



G. 4$- The 46 sp. ray.\ These sp. rays are regular in shape, but 



49. " 47 " I their ventral ends are not expanded, 



50. " 48 " Vthey show a gradual decrease in length, 



51. " 49 " I which begins from the 41st sp. ray, the 



52. " 50 " / 50th ray being 1| inches long. 



G. 53 51. This ray is stronger than those immediately pre- 



