220 APPENDIX. 



Plate 10, pages 183, 184. 



Fig. 1. — Bones from ^Codfish, (outer side) corresponding to 

 figures 1 and 2, plates 8 and 9. 



Fig. 2. — Remainder of shoulder girdle, Codfish — outer side — 

 lower part of accessory bone, page 185, showing to the left of "2." 



Fig. 3.— Codfish— Pectoral fin. 



Fig. 4. — From a Salmon, left side — same fish as plate 11. 



a. Shows where spinal chord (myelon) divides. 



b. The notochord where it passes out between the Y shaped 

 bones. 



c. Branch of spinal chord (myelon) lying upon the notochord. 



d. End of the notochord. 



e. Bone, — one of a pair between which the notochord passes, 

 and by which it is protected — the anterior end supported on a 

 pin, the posterior end is attached by fascia to the notochord. 

 This pair of bones are of curved, irregular shape. 



Below e is the short, irregularly shaped bone (also one of a 

 pair) mentioned on page 164, the posterior end (right hand in 

 plate) is attached by fascia to the anterior end of e ; when these 

 bones are in their proper position, they protect each side of the 

 notochord, nearly to its extremity. 



/. The nervous corpuscle. 



In the centre of fiig. 4, the pulsating ? sack is shown : the 

 outer surface being turned upwards, and marked by a wire loop. 



Plate 11. — Shows the right side of the caudal fin of a Salmon 

 The dorsal spinous rays are removed to show the spinal chord 

 (myelon). One hypural bone, and part of the central caudal 

 rays removed to expose the nervous corpuscle and part of carti- 

 laginous rim (page 169). One long and two short fin-rays laid 

 transversely, to show notochord. — See end of this Appendix. 



Plate 12, page 179 to 183.— Left side. 



Fig. 1. — Left pelvic bone, with part of right ; lower or ventral 

 aspect. 



Fig. 2. — Left ventral fin, ventral appendage and ligaments. 



Fig. 3. — Ventral fins, Codfish ; lower or ventral aspect. 



Fig. 4. — Ventral fins from young Salmon — upper or dorsal 

 aspect. 



