444 M. V. LEBOUR. 
organisms, ova, diatoms or other microscopic plants. Thus in Plewro- 
nectes microcephalus Copepods were only found in very few and these 
of the smallest kind in the larger fish, ova occurred in many, and diatoms 
(Navicula and Pleurosigma) and Peridinians in a few. In Arnoglossus 
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Fic. 1—Post-larval Solea variegata 12 mm. long, from balsam preparation. Eyes seen 
through from left side. 
only in those over 8mm. were there any Copepods (Pseudocalanus). 
Pleuronectes flesus from 5°5 to 10mm. had nothing inside larger than 
diatoms, but often diffuse masses which were apparently remains of uni- 
cellular organisms. Thus we have a great contrast between the two 
groups and a correlation between a large mouth with a broad, short 
gullet and stomach and an early diet of Entomostraca, and between a 
