OF THE FIRTH OF FORTH. 51 
This deep-water form is rare in the 
Firth. 
CANCERIDZ. 
Cancer pagurus (Linn.). 
Firth of Forth (Zd. Mus.). 
Common in the laminarian and littoral 
zones. 
PORTUNIDA. 
Carcinus menas (Linn.). 
Firth of Forth (£d. Mus.). 
Very abundant between tide marks, and 
in the laminarian zone, but not often found 
in deep water. 
Portumnus variegatus (Leach). 
Prestonpans and Portseaton (Howd.). 
We have taken this species at Portobello. 
P. puber (Linn.). 
We obtained one specimen on the deep- 
sea lines, from the mouth of the Forth. 
P. depurator (Linn.). 
Firth of Forth (B.). 
A very common species on the oyster 
banks, and often cast ashore. 
P. marmoreus (Leach). 
Portobello and Musselburgh beaches 
(Howd.). 
P. holsatws (Fabr.). 
Newhaven (Brit. Mus.). 
This is the P. lividus of Leach, who found 
one amongst a number of specimens of 
: P. depwrator at Newhaven. 
P. pusillus (Leach,. 
Off Prestonpans (Howd.); Firth of Forth 
(Brit. Mus.). 
Fairly common in the Forth. We have 
very frequently dredged it near Inchkeith, 
ete. 
