MAEINE SHELLS. 71 



tive. On the north-western coast, just below Fort Tourgis, 

 there is a small shell-beach which is at times very good, 

 though not always productive. We have found very nearly a 

 hundred species cast up on this beach, but most of the shells 

 are much worn and broken. 



The information given in the following pages respecting 

 Guernsey, Herm and Sark, is derived from three sources : — 



(1) The records given in Gwyn Jeffreys' British 

 Conchology (1862-1869). Dr. Jeffreys pursued his researches 

 in these islands with much success, and was aided in his work 

 by two well-known local naturalists — Dr. F. C. Lukis and 

 Mr. J. T. Gallienne. 



(2) A series of papers published in the Journal of 

 Conchology during the last ten years by Mr. J. T. Marshall, 

 of Torquay, who has a thorough practical knowledge of the 

 molluscan fauna of this region, and whose valuable " Additions 

 to British Conchology," now in course of publication, is not 

 yet completed. 



(3) A list of marine mollusca found by Mr. J. Brockton 

 Tomlin, M.A., on the shores of Guernsey and Herm, and 

 dredged in the waters between those islands. I am very 

 grateful to Mr. Tomlin for allowing me to publish this list, as 

 it fills up several gaps, and supplies information respecting the 

 relative frequency of many of the species dredged. 



A new Catalogue of British Marine Mollusca and 

 Brachiopoda was compiled by the Conchological Society of 

 Great Britain last year, and published in the Journal of 

 Conchology, vol. x, p. 9. In the present paper, however, I 

 have preferred to use the names and classification of Jeffreys' 

 great work, which still remains the most generally used text- 

 book of British students. 



The number of marine mollusca now recorded for 

 Guernsey, Alderney, Sark and Herm collectively, amounts 

 to 317 species. 



Some years ago I published two papers on the Land 

 and Fresh Water Mollusca of Guernsey, giving localities and 

 distribution of 61 species and their varieties. These papers 

 will be found in the Transactions of this Society for 1894 

 (p. 356) and 1896 (p. 111). Since then an additional land 

 shell has been found in Guernsey — Helix aculeata, and two 

 Alderney species do not occur in the larger island, viz., 

 Neritina fluviatilis and Cyclostoma elegans, so that altogether 

 the total number of mollusca recorded up to this date for 

 Guernsey and the lesser Channel Islands amounts to 381 

 species. 



