NOTES ON CORNISH CRUSTACEA. 



285 



has been found in the stomachs of Cod taken off Newquay, and 

 of a Thornback captured at Padstow. Both of the tiny Pea- 

 Crabs, Pinnotheres veterum, Bosc, and P. pisum (L.) are repre- 

 sented in the county fauna. The former occurs for the most 

 part between the folds of the mantle of Pinna fragilis, and has 

 been obtained in about 30 fathoms off Polperro, in 40 to 50 

 fathoms far south of the Dodman, in 40 to 45 fathoms about 

 eight miles south of the Gull Bock, Portscatho, from Mount's 

 Bay about midway between the Lizard and Lamorna, and 

 occasionally in trawl-refuse at Porthleven and Penzance. It 

 has also been obtained in Volsella modiolus from outside Meva- 

 gissey Bay, in the same shell from outside Falmouth Bay, and 

 once on the north coast at Padstow among trawl-refuse from the 

 Bristol Channel. Two specimens have been obtained at Scilly 

 to the west of the Bishop in the shell of Pinna, and one from 

 forty miles w r est of the Longships. P. pisum is found most 

 frequently in the mantle cavity of the ordinary Mussel, but 

 occurs also in deeper water in Cardium norvegicam, C. fasciatum, 

 Ghjcimeris glycimeris, and Volsella modiolus. It is apparently 

 rare off the eastern half of the county, a single specimen only 

 having been obtained at Port wrinkle, and two at Looe. It 

 is scarce about Polperro and in Mevagissey Bay, but is not un- 

 common in Gerrans Bay, Falmouth Bay, and the mouth of 

 Helford Biver. It is occasionally found in Volsella among trawl- 

 refuse at Porthleven. In Mount's Bay the distribution is 

 evidently irregular, but specimens have been sent in from 

 Prussia Cove and several times from Newlyn. On the north 

 coast it has occasionally been obtained by Vallentin in V. modio- 

 lus from "Bay Kough " Bocks, St. Ives, and by the writer in 

 Glycimeris from four to nine miles north of Point Navax and 

 off Fistral Bay, Newquay. From Scilly it has not yet been 

 recorded. The Masked Crab, Corystes cassivelaunus (Pennant), is 

 pretty generally distributed on fine clean sand from low water 

 down to 45 fathoms, but being a typical sand burrower often 

 eludes observation. After storms dead specimens are occasion- 

 ally found on beaches in considerable quantity, as at Marazion 

 and Vei-yan in the autumn of 1900, at St. Agnes, Scilly, in 

 September, 1904, and in Falmouth Bay about the middle of 

 March, 1905. In Whitsand Bay East this Crab is scarce down 



