EGGS AKD LARVAE OF TELEOSTEANS. Ill 



Fleming, have been examined by Mr Francis Day, and a short description 

 of the filaments is given in his British Fishes. The species occurs on the 

 British coasts. It is not uncommon on the south coast, and, according to 

 Parnell, enters the Firth of Forth in July. I have not obtained any 

 specimens hitherto. 



It is worthy of note, that if I am right in judging from Ryder's figure that 

 the rectum in the larva of Belone is in contact with the yolk sac, this fact 

 confirms the view of Claus, that the Scombresocidse do not belong to the 

 Physostomi. 



Fam. 10. Esocid,e. 



There is only one genus in this family, Esox, the pike. The eggs of Esox 

 Indus, Linn., have frequently formed the subject of embryological investigation, 

 and were part of the material on which was based the classical memoir of 

 Lereboullet, " Recherches d'Embryologie Comparee sur le Brochet, l'Ecrevisse 

 et la Perche " (Ann. d. Sci. Nat., ser. iv. vol, i. 1854). 



The eggs are small, and are deposited in February and March. They are 

 adhesive and attached to aquatic plants in narrow creeks or ditches (Day). 



The larvae of the pike at different stages are described and figured by 

 Sundevall (Svenska Vet. A/cad. Hand., 1855). The youngest stage figured is 

 two days old. The anus is nearer to the end of the tail than to the yolk sac ; 

 the pectorals are developed, but not the ventrals ; the eye is considerably pig- 

 mented, and chromatophores are scattered all over the body ; the length is 10 

 mm. ; the newly hatched larva is 9 mm. long. It is noteworthy that the pelvic 

 fins have no relation in development to the ventral fin-fold ; the latter persists, 

 extending between the pelvic fins and in front of them long after they have 

 begun to appear. 



Fam. 11. Galaxiid^e. 

 „ 12. Mormyrid^. 

 „ 13. Sternoptychid^e. 



Argyropelecus hemigymnus, Cocco, was dredged between the Shetland and 

 Faroe Islands by the "Porcupine" in 1869. Most of the species are pelagic, 

 some abyssal. The eggs are large (Day, Brit. Fishes). 



Fam. 14. Stomiatid^e. 



,, 15. SALMONID.E. 



The ova of Salmo are large, heavy, and non-adhesive. In the newly 

 hatched larva of this genus, or alevin as it is commonly called, the anus is at 



