72 
which are described as inhabiting our coasts, and it is pro- 
bable that we have one or more to which none of their 
descriptions apply. They are all termed Harbour or Mary 
Crabs, and are exceedingly ravenous, fastening eagerly on 
any animal substance that comes within their reach. 
MARBLED CRAB. P. Marmoreus. M. Edwards’ Crust., 
vol. 1, p. 442. Cancer Depurator, Pennant, p. 2, fig. 6. 
' • P. Holsatus. M. Edwards’ Crust., vol. 
1, p. 443. P. Lividus, Leach’s Malac., pi. 9. 
WRINKLED CRAB. P. Corrugalus. M. Edwards’ Crust., 
vol. 1, p. 443. Leach’s Malac., pi. 7. Pennant, pi. 5, fig. 
9. Scarce. 
DWARF CRAB. P. Pusilus. M. Edwards’ Crust., vol. 1, 
p. 444. Leach’s Malac., pi. 9. Common. 
PINNOTHERIANS, PARASITIC CRABS. 
GENUS PINNOTIJERA S : front large to conceal the 
inner antennae, which are transverse. 
PEA C RAB. P. Pisum. M. Edwards’ Crust., vol. 2, p. 
30. Leach’s Malac., pi. 14. Pennant,. pi. 1, fig. 1. 
This species seems rare with us, and only found in the 
Muscle Shell, the natural inhabitant of which it either finds 
diseased or renders so. I have never found it in the Pinna, 
as reported by authors, though many have been examined for 
that purpose. 
ANCIENT PEA CRAB. P.Veierum. M. Edwards’ Crust., 
vol. 2, p. 32, and pi. 19. Leach’s Malac., pi. 15. 
This is more rare than the last named, but there is a speci- 
men in the Museum of the Athenmum at Plymouth, as also of 
the P. Varies of Leach ; and either marked by that gentle- 
man or Mr. Prideaux, but which is supposed by Dr. M. Ed- 
wards to be identical with P. Pisum : a species that is subject 
to variation at different stages of growth. 
GONOPLACIANS, ANGULATED CRABS. 
GENUS G()NOP LAX : footstalks of the eyes long, received 
into a cavity occupying the chief part of the anterior bor- 
der of the carapace. Carapace angular and extended 
laterally. 
SQUARE CRAB. G.Angnlata. M. Edwards’ Crust, vol. 2, 
p. 61. G. Bispinosa, Leach’s Malac. pi. 13. Pennant, pi. 
5, fig. 10. 
Common in moderately deep water, and often in the sto- 
machs of fishes. 
GENUS GELASIMUS: Foot stalk of the eye long and 
slender, the transparent cornea small. Carapace resembling 
that of Gonoplax, but more advanced in front, and legs ex- 
tended laterally. 
