NOTES ON CORNISH CRUSTACEA. 



291 



doned near the Scillies after a furious gale, and afterwards 

 towed into Falmouth Docks. These Crabs were abundant in 

 the dense coating of green seaweed dotted with clumps of 

 Lepas. 



Pilumnus hirtellus (L.) is fairly common, and in places 

 plentiful, on stony and rocky beaches along the south coast and 

 at Scilly, from between tidemarks down to 15 fathoms. It 

 occurs under stones, in rock crevices, on the under surface of 

 rock ledges, in Crab- and Lobster-pots, and, when small, in the 

 hollow bulbs of Laminaria, and among seaweed generally. Occa- 

 sional specimens are taken on sand and gravel. On the north 

 coast it is abundant at St. Ives (Vallentin), fairly common near 

 St. Agnes, has been taken in Watergate Bay, is patchily abun- 

 dant at Padstow, and has been found at Port Isaac, and in 

 Laminaria at Cowrie Haven, Poundstock. Females in berry 

 are locally common from March to May. Xantho incisus, Leach, 

 is common between tidemarks along the south coast and at Scilly 

 in rock-pools, under stones, and in rock crevices. It has been 

 captured as far west as Porthgwarra. In September, 1907, a 

 single specimen was taken at Pendeen. Females in berry occur 

 in April and May. X. hydrophilus (Herbst) is similarly distri- 

 buted along the south and at Scilly, but on the whole is not so 

 plentiful. On the north coast it has been taken near St. Agnes 

 Beacon and in Fistral Bay. X. (Xanthodes) Couchii (Couch) 

 does not seem to have been found again since the type-specimen 

 was forwarded to Bell by B. Quiller Couch in the early fifties. 



The dainty little Crab Pirimela denticulata (Mont.) is very 

 local in its habitats, but by no means rare. It occurs from low 

 spring-tide down to 15 fathoms, and is occasionally found still 

 deeper. It has been taken round Plymouth (M. B. A.), in shallow 

 water to the west of Downderry, in 10 fathoms in Gorran Bay, 

 and is fairly common in Veryan Bay, and in Gerrans Bay in 

 patches covered with small stones. It has been found several 

 times in trawl-refuse at Porthleven, but not at Mevagissey. In 

 Falmouth Harbour and Bay it is locally not uncommon, but 

 has not been obtained between Helford and the Lizard. In 

 Mount's Bay it has been captured to the west of the Boa and at 

 Poljew Cove, but has not been recorded for the western side at 

 all. It has been taken at low spring-tide at Porthcurnow, and 



