


MARINE BIOLOGICAL STATION ON PUFFIN ISLAND. 389 
abundance of animals, but the bottom and surface gather- 
ings differed greatly in appearance and in constitution. 
The net from the bottom contained mainly large Amphi- 
poda, and some Cumacea, while the gathering from the 
surface was characterised by the abundance of Copepoda. 
Mr. A. O. Walker has supplied me with the following 
list of Crustacea from the bottom net. 
CumacEA :—Iphinoé trispinosa,* Cuma Reena dee and 
Pseudocuma cercaria (many) .* 
AMPHIPODA :—Anonyz sp.,* Monoculodes grubei,* Ponto- 
crates norvegicus, Phoxus holbolli, Metopa sp., Dexamine 
vedlomensis, Bathyporeia pilosa, and a remarkable un- 
described species provisionally named by Dr. Norman as 
Megalonoura agilis. 
At first sight it seemed that the Amphipods from the 
illuminated deep nets were all red-eyed species, such as 
Ampelisca levigata and Bathyporera pilosa, and this 
suggested that possibly there might be a relation between 
the colour of the eyes and sensitiveness to the electric 
light. A detailed examination of the material has shown, 
however, that this will not hold good strictly as, although 
the red-eyed specimens are the most abundant and con- 
spicuous, still others are present. 
Mr. Walker points out that all the Cumacea taken both 
at Ramsey Bay and Port Erin were males, and that the 
probable reason is that the males of all the three species 
represented are provided with pleopoda (or swimming legs), 
while the females are not, and that consequently the 
males are no doubt more active swimmers, and therefore 
more likely to rise from the sea-bottom where they live. 
Mr. Thompson has identified the following species of 
Copepoda from the illuminated surface nets :—Calanus 
finmarchicus, Pseudocalanus elongatus, Dias longiremis, 
* New to fauna. 
