164 MARIE V. LEBOUR. 
diatoms, but sometimes the case is entirely of sponge spicules. 
As the worm grows the house becomes transparent and hyaline. 
(11) Pectinaria sp. larva. Only found rarely in October and December. 
(12) Annelid larvee indet. Occurred occasionally but particularly from 
January to the end of March when they were at times abundant 
in verv young stages. 
(13) Tomopteris heligolandicus Greef. Begins in the middle of June and 
is very common in July, rare in September and October. Young 
forms chiefly from July to September. 
CHATOGNATHA. 
Sagitta bipunctata (Q. & G.). Present throughout the year, scarce in 
most of March, April, May and June. Very common most of the rest of 
the year. 
POLYZOA, 
Cyphonautes larva. Fairly common from September to the end of 
March, rare from April to August. Commonest at the end of March. 
PHORONOIDEA., 
Actinotrocha larva. Only seen in July and September, 1916. More 
common in 1915. 
ROTIFERA. 
Syncketa sp. Rare, September, October and March. 
CRUSTACEA. 
COPEPODA. 
Sars, G. Q., “ Crustacea of Norway, Copepoda.” 
(1) Calanus finmarchicus Gunner. Common on and off from the end 
of April to the begining of November, generally present in small 
numbers at other times. 
(2) Paracalanus parvus Claus. Unusually scarce this year except at 
certain times. Very common in May, common parts of August, 
September and October. Very common for part of November, 
then becomes rare or absent. 
(3) Pseudocalanus elongatus Boeck. Perhaps the commonest copepod 
here. Hxceedingly common all through the year except from 
the middle of May to the end of July, when it becemes rarer and 
is Sometimes absent. 
