118 MR J. T. CUNNINGHAM ON THE 



Arnoghssus megastoma, Donovan. — A specimen of this species, taken 16 

 miles E. by N. of May Island, April 30, 1886, in the trawl, was brought to the 

 station. The ova Avere quite immature. Thompson at Belfast, according to 

 Day, ascertained that it spawned in October. 



Plagusia. — The young, about 1 inch long, is figured by Agassiz in Young 

 Stages, ii., but not the eggs or larvae. 



Thus all the Anacanthini, as far as at present known, except Lota, have 

 pelagic ova, and in all the rectum at the time of hatching is in contact with 

 the yolk. In Gadus and Motella the anus is not open, and does not extend to 

 the margin of the ventral fin-fold. 



Order III. ACANTHOPTERYGII. 



Div. I. Perciformes. 



Fam. 1. PercidtE. 



The young of Lahrax lineatus, Bl. and Schn., are figured by A. Agassiz in 

 Young Stages, iii. In the youngest stage figured, 3 5 mm. in length, the yolk 

 sac is already absorbed. The larvae were taken at the surface of the sea with 

 the tow-net, but the eggs were not found. The ova of Perca fluviatilis are 

 adhesive, and attached to fresh-water plants. An account of them is given by 

 Sundevall. Hatching occurred fourteen clays after fertilisation. The newly 

 hatched larva was 5 mm. long ; there was a single oil globule in the yolk sac, 

 and the anus was slightly separated from the latter. Spawning took place in 

 May. 



The ova of Serranus cabrilla are stated by Hoffmann to be pelagic. 



Fam. 2. Squamipennes. 

 „ 3. Mullid/e. 

 ,, 4. Sparid^e. 



Fam. 5. Cirrhitid^;. 



6. SC0RPiENID/E. 



This family consists exclusively of marine fishes, and all the species that 

 have hitherto been studied from the embryological point of view have 

 pelagic ova. 



An account of the ovum of Scorpama is given in Hoffmann's memoir, 

 published in the Transactions of the Amsterdam Academy, 1881. The species 

 observed were S. porcus and >S'. scrofa. The ripe ovum before fertilisation 

 consists of a perfectly homogeneous glassy yolk surrounded by a thin envelope 



