140 



Part III. — Twenty -third Annual Report 



Fig. 9. Otolith of Plaice, 12cm. long, $ immature, caught near Aberdeen, April 

 1, 1905. Shows only one year's growth. 



PLATE VIII. 



Fig. 10. Scale of Plaice, 35cm. long (14 inches), from Aberdeen. Zeiss A Oc.2. 



Shows five annual zones of growth. 

 Fig. 11. Otolith of same specimen. Zeiss a. 2 Oc.2. Shows also five zones of 



growth, with slight irregularity in fourth zone. 

 Fig. 12. Otolith of Plaice, 31 "2cm. long (12£ inches), from Aberdeen. Shows 



three annual zones. 



Fig. 13. One of the anterior vertebra; of Plaice, 18| inches long, from Aberdeen, 

 showing the zones of growth in the concave face of the vertebra. 



Fig. 14. Coracoid and scapula of same specimen, showing five zones of growth. 



Fig. 15. Scale of Cod from Dr. Fulton's experiments, killed August 1904, in its 

 second 3'ear. Zeiss A Oc.2 camera. Shows two annual zones. 



Fig. 16. Cod, 30'7cm. long, caught near Aberdeen, March 1905. Transverse 

 section of otolith, showing two annual zones of growth. 



PLATE IX. 



Fig. 17. Transverse section of skin of Cod from Dr. Fulton's experiments. Pre- 

 served with formaline. Zeiss A Oc.3. 



Fig. 18. Portion of same section under higher power, to show nuclei on upper 

 and lower surfaces of scale, and at edge. 



Fig. 19. Surface view of scale of Whiting under higher power, showing nuclei 

 on upper surface and their relation to the ridges of the sclerites. 



Fig. 20. Pectoral girdle of Cod. CI. =Clei thrum (clavicle). Co. = Coracoid. 

 S. = Scapula. 



