FOOD OF POST-LARVAL FISH. 453 
but all except 2 contained Crustacea. One of 4-5 mm. contained remains 
of Crustacea but indistinguishable. Temora longicornis occurred in 3, 
Euterpina acutifrons in one, Podon (cf. intermedius) in 3. Paracalanus 
parvus and Pseudocalanus elongatus occurred in one specimen. 
These two Zeugopterus have large mouths and short and thick gullets 
and the food is much like Solea and P’euronectes limanda. 
SCOPHTHALMUS NORVEGICUS (Grup.). 
404 specimens, preserved, were examined from the Young Fish Trawl, 
1914, 3-5 to 12 mm. long. There were only 2 of 12 mm. and neither of 
them contained any food. Thirty-six contained nothing, 34 contained 
ova only, two were indistinguishable and the rest contained Crustacea, 
chiefly Copepods, Podon occurring in several. Copepod remains which 
were indistinguishable were in 55 specimens of all sizes. The smallest 
(3-5 mm.) contained Copepod remains (probably Pseudocalanus) so as 
Scophthalmus norvegicus hatches at about 2-5 mm. it must take Copepod 
food almost directly. A specimen 45mm. long contained a Metridia 
lucens 2mm. long. One of 4mm. contained a Paracalanus parvus, so 
there is no evidence that the smaller specimens eat anything different 
from the larger specimens, the same sort of food being found in all of 
them in these samples. A very few contained diatoms (Paralia sulcata 
and Navicula sp.), which very likely come from the alimentary canal of the 
Copepods. One specimen of 4mm., which contained Copepod remains, 
contained also Peridinium ovatum, Prorocentrum micins and remains of 
other Peridinians. One contained Tintinnopsis ventricosa. Spores 
occurred once. Much more food was found in the specimens from Hauls 
X to XVI and little food in those from the later hauls. 
Ova occurred in 34 specimens without anything else and in 65 speci- 
mens altogether. They are more abundant from the later hauls. Ap- 
parently when many Copepods are eaten these are not taken so much. 
All sizes eat them, but they are commonest in the smaller specimens of 
from 4 to 5-5 mm. 
Copepods are evidently the favourite food and are found in 334 
specimens. The favourite is certainly Pseudocalanus elongatus, which 
occurs in 158 specimens, as many as 6 at once and in all sizes from 
4 to 11-5 mm., one of 3-5 mm. probably containing it also. It is very 
abundant, especially from Hauls X to XVI, absent from XVIII to 
XXVI. 
The next favourite is Metridia lucens, which occurs in 75 specimens, 
up to 3 in one specimen, in all sizes from 4-5 mm. upwards, in the same 
hauls as Pseudocalanus elongatus. Next come Acartia (cf. Clausiz) in 49, 
Onceea (cf. media) in 26, Paracalanus parvus in 25, Euterpina acutifrons 
