Carapace subglobose, dorsally vaulted, surface with fine pubescence obscuring regions; submedian lobes prominent, median ventrally placed, cervical groove prominent. First segment of antennal peduncle freely moveable, excretory pore conspicuous. Antero-lateral margins of carapace with five teeth, the third obscurely bifid. Chelipeds stout and equal, inner surface of propodus with dense long setae, distally naked; fourth and fifth pereiopods flattened, subdorsal and subchelate. Female chelipeds smaller than in male; male chelipeds robust, coxa of fifth pereiopod with long penis.
Carapace length up to 53 (75) mm.
Depth range from lower shore to about 8 metres. Not common. Ovigerous in July with late zoeae in September.
Pubescence dark brown, naked tips of cheliped propodus and dactylus pale pink or white.
Thames, East Channel, Wight, Channel Isles, Plymouth, Scilly Isles, Bristol Channel, Cardigan Bay, Anglesey, Liverpool Bay.