72 



which are described as inhabiting our coasts, and it is pro- 

 bable tbat 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. Corrugates. M.Edwards' Crust., 

 vol. 1, p. 443. Leach's Malac, pi. 7. Pennant, pi. 5, fig. 

 9. Scarce. 



DWARF CRAB. P. Pusilns. M. Edwards' Crust., vol. 1, 

 p. 444. Leach's Malac, pi. 9. Common. 



PINNOTHERIANS, PARASITIC CRABS. 



GENUS PINNOTHERAS: front large to conceal the 



inner antennas, which are transverse. 

 PEA CRAB. 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.Veterum. 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 Athenaeum at Plymouth, as also of 

 the P. Varius of Leach ; and either marked by tbat gentle- 

 man or Mr. Prideaux, but which is supposed by Dr. M. Ed r 

 wards to be identical with P. Pisum : a species that is subject 

 to variation at different stages of growth. 



GONOPLACIANS, ANGULATED CRABS. 



GEXUS GONOPLAX: 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. Angnhda. 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-r 



machs of fishes. 



GEXUS GELASIMUS: Foot stalk of the eye long and 

 slender, the transparent cornea small. Carapace resembling 

 that of GouopJax, but more advanced in front, and less ex- 

 tended laterally. 



