TREGELLES : MARINE MOLLUSCA OF CORNWALL. 193 
Scilly has been so well dealt with in this journal by the 
Rey. R. W. J. Smart and the late Mr. Clifford Burkill that I can 
add little to their remarks on that interesting, nay fascinating, 
archipelago, except to mention the occurrence there of thirteen 
species, as yet unrecorded for the mainland of Cornwall, viz. : 
Natica sordida Phil., Rissoa Jeffreyst Wall., Eulima curva Jeff., 
Odostomia conspicua Ald., Trophon clathratus var. truncata Str., 
Bela Trevelyana Vurt., Mangilia levigata (Phil.) type, Zornatina 
expansa Jeff., Montacuta Dawsont Jeff., Lepton sulcatulum Jeft., 
Galeomma Turtont Eds. Zool. Journ., Argiope decollata Chem., 
and A. cistellula S. Wood. 
The nudibranchs of Cornish seas have not received the 
attention they deserve, but the admirable paper by Mr. Garstang 
shews how rich is the field at Plymouth; and Falmouth has 
been well worked by the late Mr. W. P. Cocks and by Mr. 
Rupert Vallentin. Mount’s Bay and Scilly, however, are 
practically untouched. 
I regret that I cannot include the land and freshwater 
mollusca in my lst, and must refer my readers to Mr. Mar- 
quand’s paper, which deals with West Cornwall only. 
The classification adopted is in the main that of the Rev. 
A. H. Cooke, M.A., in his recently published ‘Molluscs ” 
(Cambridge Natural History, vol. i., 1895), with hints from 
Canon Norman’s unfinished ‘‘Revision of the British Mollusca” 
(Ann. and Mag. of N.H., 1890), and I am indebted to Dr. 
G. W. Chaster for valuable assistance 1n revising the terminology 
of genera and species. 
I need not enumerate the more general works on con- 
chology that have been consulted, but the following papers, etc., 
of local interest should be mentioned :— 
Jonathan Couch, ‘‘Cornish Fauna,” 1841. 
“List of Shells, Mount’s Bay,” 1855: Trans. Penzance N.H. 
and Antiq. Soc., old series, vol. i1., p. 196 (Penz. List). 
W.. P. Cocks, “Fauna of Falmouth”: Rep. R. Cornwall Poly- 
technic Soc., 1849. 
) 
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