- SEA FISHERIES LABORATORY.  - 133 
shows the corresponding endopodite of an immature female 
of about the same size (12 inch) as the mature males. 
Figures 7 and 8 show the ovary and testis of the two 
mature Shrimps from which the appendages were taken. 
It will be seen on comparing figs. 5 and 6 that the only 
differences in this endopodite between male and female 
Shrimps of the same length are (1) the size, the female 
branch being decidedly longer, and (2) in the arrangement 
of the sete along the inner side. The female endopodite 
has only a small number (8—6) of short stout curved sete 
or bristles, while in the male the setz are more numerous, 
forming a continuous row, and are longer and more deli- 
cate and hair like. 
In this neighbourhood most of the large female Shrimps 
spawned in November. They appear to cast their cuticles 
just before spawning. Many of the Shrimps caught in 
the end of October have recently cast their ‘“‘skins,”’ and 
the exuvie are frequently taken in the Shrimp nets about 
that time. 
A few Shrimps can be found at almost any time with 
‘“‘spawn’’ (embryos) on the abdomen, but there seem to 
be two chief periods in the year here, just as Ebrenbaum 
found on the German coast. The times here seem to be 
late Autumn (beginning of November) and early Summer 
(April and May.) About 5000 eggs are deposited on the 
abdomen at a time by a fully mature Shrimp. 
It is very evident even from the few observations we 
have yet made that there are very many enemies to the 
Shrimp in all stages of its existence in this neighbourhood. 
We find it frequently in the stomach of Agonus cataph- 
ractus and Liparits montagut and many other fish. Skates 
eat it in enormous quantity, the large stomach of the fish 
being sometimes distended with a quart or so of Shrimps. 
The enormous variations in the catch of Shrimps from 
