FOOD OF POST-LARVAL FISH. 457 
2 Acartia Clausi, one Coryceus anglicus and the remains of Centropages 
typicus, the last contained 2 Temora, 4 Centropages typicus, many Pseudo- 
calanus and 2 Paracalanus parvus. 
SYGNATHUS ROSTELLATUS Nitss. 
Three specimens examined fresh from the tow-nettings, from among 
Zostera, both inside and outside the Breakwater, August and September, 
4-5 to 10-5em. Two contained remains of Decapods, the third con- 
tained 3 crab zoex, one Acartia sp., 8 Pseudocalanus elongatus and 
other Crustacea remains. 
NEROPHIS LUMBRICIFORMIS Yarr. 
Three specimens examined fresh from the tow-nettings from both 
inside and outside the Breakwater, August and October, 10 to 40 mm. 
2 contained nothing, the third a young Copepod and 3 Copepod nauplii. 
The young begin to feed almost at once. A male with eggs from Wem- 
bury was put in a glass jar and kept at a uniform temperature by 
immersing in a tank and the eggshatched. Plankton was given at once, 
and after the first day, when a large yolk sac was present, the little fish 
ate Halosphera viridis, larval Mollusks and small Copepods. 
CLUPEA HARENGUS L. 
1795 larval and post-larval Herrings were examined fresh from the tow- 
nettings, from both inside and outside the Breakwater, from January to 
March and again in October, measuring 5-5 to 18mm. The yolk sac was 
present in all those from 5-5 to 8mm., but it may remain up to 12 mm. 
in exceptional cases. However, even with the yolk present, from 7 mm. 
food may be taken. The yolk seems to stay longer in some lots, as 
though there were a shortage of food in certain areas with a consequent 
lengthening of time in keeping the yolk. The smallest specimen with 
any food inside measured 7 mm., and that was only green food remains. 
At 8mm. Harpacticids may be taken and larval Mollusks. 
On January 30th, 589 specimens from 7 to 12 mm. (mostly 7 to 10 mm.) 
were taken and all of these, except one of 12 mm., contained no food, the 
exception containing one Huterpina acutifrons. Those measuring from 
7 to 10mm.all had the yolk sac still present. On February Ist another 
lot of 431, measuring from 8 to 10 mm. all had the yolk sac still present 
except one of 10 mm., but 35 contained food, 16 of these containing larval 
gastropods, 2 larval bivalves, 12 green food remains, one a Harpacticid, 
one a Copepod nauplius, one 2 Peridinians (Prorocentrum micans and 
