part 4] 



X0X-MAR1XE MOLLTJSCA OF OLAC'TOX-OX-SEA. 



629 



Appendtx VI. — The Nox-Martxe Mollusca of Clactox-ox- 

 Sea. By Alfred Saxter Kexxarj), F.O.S., and Bernard 

 Barham Woodward, F.L.S., F.G.S. 



An account of the non-marine mollusea of Clacton based on the 

 known collections was published by us in 1S97, 1 when we were aide 

 to record sixty-one species ; but of these fifteen were unconfirmed 

 records. Since then Dr. Frank Corner has kindly sent us a small 

 series principally obtained from the estuarine bed, while the 

 extensive collection of the late Dr. Henry Woodward has passed 

 into our keeping. From this additional material we were able to 

 raise the total number of known species to sixty-seven. 



We are greatly indebted to Mr. S. Hazzledine Warren for placing 

 at our disposal the results of his systematic exploration of these 

 beds. The number of known species is now eighty-two, the longest 

 list from any English Pleistocene deposit. One species, Vertigo 

 pusilla Midler, although recorded by S. V. Wood, 3 we have omitted, 

 since there are no examples extant. In the following table we 

 have indicated in the first column the results of previous work, 

 while the remainder show the frequency of each species in the 

 various layers recognized by Mr. Warren. 



Table of Distribution of the Non-Marine Mollusca. 



[R=rare; C=common.] 



Limax ma.vimiis Linn 



L. arbor urn Bouch.-Chant 



Vitrea crystaUina (Miiller) 



Helicella cellaria (Miillev) 



H. nitldula (Draparnaud) 



H. radiatula (Alder) i 



Zonitoides nitidus (Miiller) 



Z. excavatus (Alder) 



Tetasinafulva (Miiller) 



Avion sp 



Punctwn pygmeeum (Draparnaud) ... 



Ooniodiscus rotundafus (Miiller) 



Gr. ruderatws (Studer) 



Jacosta itala (Linn.) 



J".crajg/brda»sts(KenD.&B.B.Woodw.) 



Wruticicola Mspida (Linn.) ! 



Acanthinula acuteata (Miiller) 



Vallonia pulchella (Miiller) 



/'. excentrica Srerki ' 



I'. eostata ( Miiller '■ 



Chilotrema lap eida (Linn.) 



Arianta arbustorum (Linn.) 



Bases Naturalist ' vol. x 

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ii. Pal, Soo, 1S5G, pp. 3<»7-l0, 



