11)06.] AXATOMY OF CEXTROPHORUS CALCEUS. 867 



formalin (about 8 per cent.) in oi-der to ensure the complete 

 preservation of the tissues until I should have an opportunity of 

 properly examining them. I have always found strong formalin 



Text-%. 127. 



CentropJiorus calceus (uftia- Bocage & Capello). 



a most excellent fixing and preserving reagent when required to 



1)6 used in large quantities, and it was so in this case ; as is well 

 known, large animals preserved in spirit are of little use for 

 histological purposes. 



Princiixd Measurements of the Fish. 



centira. 



1 . Leng-th of fish between extremities of snout 



and tail 87 



2. Distance of base of spine of anterior dorsal 



fin to tip of snout 30 



8. Length of base of anterior dorsal fin 



(including spine) 11 



4. Length of base of posterior dorsal fin 



(including spine) 9 



5. Distance between anteiior aiid posterior 



dorsal fins 19 



6. Lengtli of base of ventral fin 1 2'5 



7. Distance between posterior end of base of 



ventral fin and tip of tail 7 "5 



8. ,, from cloacal aperture to tip of tail... 29 



9. ,, from front row of teeth on ujjpei- 



jaw to tijs of snout 11 



10. ., from anterior cantlius of eye to tip 



of snout 8'5 



11. „ of nares from tip of snout 4-5 



12. ., from anterior edge of spiracle to 



tip of snout 12"75 



13. ,, between spiracle and first gill-cleft. 3 



14. Length of side of bodv occupied by the five 



gill-clefts " 3 



15. Longitudinal diameter of eye 3 



16. Vertical diameter of eye 1-3 



17. Distance from base to tip of pectoral fin ... 12 



18. ,, from base to tip of pelvic fin 8'5 



19. Transverse diameter of mouth 6 



20. Length of spiracular cleft 1*25 



21. ,, of each gill-cleft 2 



22. Vertical height of anterior dorsal fin 3*5 



