A HISTORY OF CORNWALL 



' Opisthobranchiate Mollusca Found at Plymouth' in the Journ. Marine Blol, Assoc. (1890). 

 9. G. Fox Tregelles, 'The Marine Mollusca of Cornwall' (Journ. of Conchology, 1896). This is 

 by far the most complete list of species with their distribution around the county that has yet 

 appeared, and includes practically all the previous records. 10. J. T. Marshall, ' The Marine Shells 

 of Scilly ' (Journ. of Conchology, 1897). This consists of an additional list of Scillonian species 

 obtained by the author. 1 1. ' Plymouth Marine Invertebrate Fauna ' (Journ. Marine Bio I. Assoc. vii). 

 This list includes all the more prominent forms of marine mollusca from the district, but is incomplete 

 as regards the smaller and more critical species. 



In addition to the data from these various published papers the list that follows contains all the 

 more important records of the Nature Study Society at the Technical Schools, Truro, during five 

 years' ardent shore collecting by many of its members. A considerable amount of dredging has also 

 been done on the south coast, but especially in Falmouth Bay and in 35 to 45 fathoms off the 

 Dodman, and a great deal of attention given to trawl refuse wherever it has been available. 

 Mr. A. Robinson has very kindly supplied the writer with a MS. list of his takings around Polperro, 

 Mr. C. P. Richards of species obtained in the St. Austell district, Mr. J. H. James of those he has 

 taken in the Truro, Falmouth and Helston districts as well as elsewhere in the county, 

 Mr. Rupert Vallentin of those found by him around Falmouth, and Mr. F. W. Thelwell of those 

 secured by him at Harlyn Bay, near Padstow. The collections of Cornish shells in the museum of 

 the Royal Institution of Cornwall, of Mrs. Paull at Bosvigo, Truro, and of Mr. J. H. James, have 

 been of great service in the preparation of this section of the work, and much labour has been saved 

 to the writer through the kindness and thoughtfulness of Mr. G. F. Tregelles in lending him a 

 carefully annotated copy of his 'Marine Mollusca of Cornwall.' The records of critical species 

 and varieties in the following list are for the greater part limited to specimens that have been identi- 

 fied by Mr. J. T. Marshall, the Rev. A. H. Cooke, and the late Mr. Robert Bell, so that their 

 geographical distribution in the county is in many cases undoubtedly wider than the number of 

 localities mentioned would suggest. Where there is uncertainty about any particular record the 

 doubt is always indicated in the text. 



LIST OF CORNISH MARINE MOLLUSCA 



AMPHINEURA 



1. Rhopalomfnla aglaophenla, Kov. & Mar. Occ. 



twined round the base of the stem of the 

 hydroid Aglaophenia myriophyllum ; c. Eddystone 

 and Rame-Eddystone Gnds. (M.B.A.) ; off the 

 Dodman ! in 35 fm. Falmouth B. ! 



2. Myzomenia banyulensls, Pruvot. Often associated 



with the erect form of Lafoea dumosa ; Eddy- 

 stone Gnds. (M.B.A.) ; off" the Dodman ! 



3. LeplJopleurtu cancellatus, G.B. Sow. Scarce at Fal- 



mouth and Helford ; St. Mary's S., Scilly 

 (M.) 



4. Hanleya hanleyt, Bean. Falmouth (Cocks) ; a per- 



fect example and several plates in St. Mary's 

 S., Scilly (M.) 



5. Tonicella rubra, Lowe. Falmouth (Cocks) ; Mount's 



B. (Pcnzance List) 



6. Callochlton laevis, Mont. N. unc. under stones 



near 1. w - m., Plymouth S. ; Fowey, Fal- 

 mouth, Helford, Mount's B., Land's End, 

 and St. Mary's S., Scilly 



7. CraspiJochilus onyx, Spengler. N. unc. along the 



S. coast and in places abund. from 1. w-m. to 

 deepish water ; Hayle, Padstow, and n. unc. in 

 the Menavawr dredgings at Scilly. var. rissoi 

 Jeffreys, found at Scilly by Marshall 



8. C. cinereus, Linn. Under loose stones between 



t-m. in Plymouth S. ; and at Fowey, Port- 

 scatho, Falmouth, Mount's B. (Tregelles) and 

 Scilly 



9. C. albus, Linn. Under stones between t-m. on 



Porthpean beach, St. Austell (Richards) ; 

 dredged in shallow water near Helford ! 



10. Acanthochitcs fascicular'u, Linn. Under stones and 

 among barnacles down to 1. s. t. ; probably all 

 along the S. coast from Whitsand B. to Mouse- 

 hole ; not recorded from the Lizard ; Fal- 

 mouth and Scilly, r. 



\\. A. dlscrefans, Brown. Lantivet B. (J.C.), Fal- 

 mouth, Helford and Mount's B. r. 



PELECYPODA 



12 



14. 



PROTOBRANCHIA 



fm. 



Nucula nucleus, Linn. Locally c. from 10 

 downwards round the coast ; shells cast up 

 along S. and at Hayle, Perranporth, St. Minver, 

 Bude ! live specs. Cawsand B. and Eddystone 

 Gnds. (M.B.A.), off the Dodman, 40 fm. ! in 

 Falmouth Harb. 1 5 fm. (V.) and at Scilly ; var. 

 radiata, F. & H. Falmouth (Hockin) and in 

 Mount's B. (Tregelles) 



N. nit'.Ja, G. B. Sow. Cawsand B. and ' outer ' 

 trawling gnd. at the Eddystone (M.B.A.) ; 

 40 fm . off the Dodman ! I 5 fm. at Helford ! 

 Falmouth (Cocks), Mount's B. (Penzance List), 

 Porthcurnow! Wolf Rk. and Hayle (Miss 

 Came) 



FlLIBRANCHIA 



Anomla ephippium, Linn. V. gen. dist. on S. 

 coast and at Scilly, between t-m. down to 20 or 

 30 fm. on rocks, stones and shells ; Hayle,Perr.in- 

 porth ! Harlyn B. (Thelwell) and Padstow B. ! 

 var. sjuamula Linn. Land's End (Hockin) ; 

 Scilly (S. & C.). var. aculeata Mall. Land's 

 End (R.Q.C.) ; Scilly (S. & C.) 



140 



