FOOD OF POST-LARVAL FISH, 451 
certainly vegetable, one containing Paralia sulcata and Fragillaria sp. 
Not one contained any Crustacea remains, and here we have a very dis- 
tinct difference between the Flounder and Dab and the various species of 
Solea. The gullet and stomach of the Flounder is long and narrow and 
the mouth small, which go with its method of feeding. 
PLEURONECTES MICROCEPHALUS, Donoy. MrErry So te. 
Only one fresh specimen was obtained from the tow-nettings, West 
Channel in April, but it was very small, 4 mm. with yolk sac and no 
food. E 
247 preserved specimens from the Young Fish Trawl, 1914, were 
examined, 5-‘5mm. to 185mm. Of these 195 contained no food, 35 
contained ova; only one Copepod was distinguished, Huterpina acuti- 
frons, i a specimen 10 mm. long. Podon (cf. intermedius) occurred 
in 3, 85 to 10 mm. long. Sixteen contained remains of Crustacea, 
5 of which were recognizable as remains of small Copepods. One 
Peridinium sp. occurred and diatoms (Navicula and Pleurosigma) 
occurred in 3. 
Thus the food of the “ Merry Sole” is much more like that of the 
Flounder, than of the Dab and Sole, and its mouth and alimentary canal 
are of the small and narrow type which seems to go with a vegetarian 
diet, or at any rate a diet of small and soft organisms other than Crus- 
tacea. 
ARNOGLOSSUS SP. (Wazs.). 
These are chiefly 4. laterna. 288 specimens, preserved, were examined 
from the Young Fish Trawl, 1914, 3-5 to 22-5 mm. long. Nearly all the 
smaller specimens were from the early hauls (XIII to XXXVI). Most 
of the larger specimens being from the later hauls (XLII to LXXXIII). 
The almmentary canals of all the small specimens up to 8 mm. (except one 
ovum in a specimen of 5mm.) were empty ; one of 8-5 mm. contained 
Pseudocalanus, but with that single exception those measuring 8-5 to 
10mm. were empty. From 10-5 mm. to 22-5 mm. some specimens con- 
tained Copepods, but very many wereempty. 241 out of 288 were empty, 
and of these 208 were from the early hauls in which only 3 contained 
anything, one of 5mm. containing an ovum, and 2 specimens of 14 mm. 
in Haul XXXVI containing Pseudocalanus, which is the earliest appear- 
ance of a Copepod in any of the specimens. Twenty-five contained 
Copepods, 18 of which were Pseudocalanus (as many as 15 in one speci- 
men 19-5 mm. long), one contained Paracalanus parvus and one E uter pina 
acutifrons. From this it seems that the smaller specimens do not eat 
Copepods and the larger specimens only eat the small species. Only a 
