89 

 THE MARINE MOLLUSCA OF SUSSEX. 



IJv R. WINCKWOKTH, M.A., F.R.G.S. 



(Read before the Society, December istli, 1916). 



The two principal localities whence these records have been obtained 

 are the foreshore at Black Rock, Brighton, which is of chalk, and the 

 coast within a few miles of Eastbourne, where I have dredged in 

 shallow water of seven to fifteen fathoms over bottom of considerable 

 variety, sand, shellsand, broken shell, mud, gault clay, mussel beds, 

 and brusk. My Brighton dredgings have so far not been so success- 

 ful ; considerable areas consist of hard chalk, and it is a four miles 

 pull to get to the ten fathom line. Many of these records are new 

 for Sussex, a coast which seems to have been very little studied, if 

 we except the work of the Hastings Natural History Society. Yet 

 the district is an interesting one, and fairly rich in life, as the seventy- 

 three species recorded for the foreshore alone shew. 



Among the more interesting records is Acantlwchiton discrepans 

 (Brown), usually regarded as a Channel Island species. There is 

 also a large colon)- of this species off Bembridge in the Isle of Wight, 

 where I have dredged some thirty specimens in four to five fathoms. 

 To these localities Brighton may now be added. Another shell 

 usually associated with the western part of the channel is Lepton 

 squamosuin (Montagu), single valves of which I have dredged several 

 times off Brighton and Eastbourne. So also Pandora inceqiiivalvis 

 (L.), seems to be not uncommon at Bracklesham, and I have worn 

 valves washed ashore from near Dungeness. Further exploration of 

 Hampshire and Sussex shores may well bring records of other western 

 channel species. 



In the following list I have used ttie nomenclature of the Concho- 

 logical Society's List of 1902, and abbreviations are as under: — 

 B.R. denotes records from the shore at Black Rock, Brighton ; B. 

 denotes dredgings at Brighton ; E. denotes dredgings at Eastbourne. 



AMPHINEURA. 



Craspedochilus onyx (Spengler). — Common on shells and stones, E. 

 Craspedochllus cincreus {\^.). — Plentiful, B.R. 

 Acanthochiton faicicularis (I^.). — Not common, B.R. ; Seaford. 

 Acanthochiton discrepans (Brown). — Two '(\\\^ specimens at extreme 



low water under stones, B.R., 27 Sep., 1912, and 30 Sep., 1913. 



The larger was i"3 x o"75. It is not sur{)rising that an occasional 



individual of this species should a[)pear, seeing they are to be 



found plentifully off Bembridge, Isle of AN'ight. 



