FOOD OF POST-LARVAL FISH. 447 
young. ‘Twenty-two contained nothing, but the remainder had a good 
deal of food inside them, the smallest eating the same as the largest. 
Nearly all the food was Crustacea and small ova of two kinds, one with 
a tough sheath, the others without, and perhaps being ova of Copepods. 
The majority of the Crustacea were Copepods, Cladocera (Podon) coming 
next in abundance, and the cypris stage of Balanus. Ofthe Copepods the 
Fic. 4.—Post-larval Pleuronectes microcephalus, 12 mm. long. Right eye seen 
through from left side. 
Harpacticid Huterpina acutifrons is the most frequent, occurring in 60 
out of the 221 specimens, as many as 5 or 6 often being found in one 
individual. From May 22nd they are particularly abundant in Hauls 
XIII to XVII (for particulars of the hauls see Allen (1917) both from 
the region of the Eddystone and Rame, evening and morning, midwater 
and surface, and occur in fish from 4mm. to 10-5 mm. long, very often 
