part 4] THE KON-MARIXE MOLLUSCA OF CLACTOX-OX-SEA. G31 



From the estuarine bed three species were obtained, namely :— 



Paladilhia radigueli (Bourgnignat) common, 

 Vivipara diluviana (Knnth) rare, 

 Corbicula fluminalis (Miiller) rare, 



as well as two marine species, namely : — 



Scrobicidaria plana (Da Costa). 

 Cardium edule Linn. 



Thus sixteen new records are added to the list, while eight known 

 species were not represented in Mr. Warren's collection. 



Notes on the Species. 



Limax. — Hitherto no species of Limax has been recorded from 

 Clacton. Why this genus should be so rare in this deposit is 

 puzzling, for, as a rule, it is quite common in Pleistocene beds. 



Zoxttoides excavatus (Alder). 



An extremely rare form in the Pleistocene, Dog Holes, Warton 

 (Lancashire), is the only other record. It is unknown living in 

 Essex, though it is known from the early Holocene of Copford 

 and Chignal St. James. 



FftUTICTCOLA HISPIJDA (Linn.). 



This species is represented by the large flat form, so common at 

 Woodston (Huntingdonshire), to the total exclusion of the high- 

 spired liberta (Westerlund). It is, however, possible that the 

 Helix conoidea Sowerby l may be liberta, although we have seen 

 nothing from Clacton that in any way resembles Sowerby's species. 

 In the collection of Dr. Henry Woodward were several examples 

 of a high-spired liispida labelled ' Clacton ', which came from the 

 same source as the shells described by G. B. Sowerby : namely, 

 John Drown, of Stan way. 



The locality ascribed to Dr. Woodward's examples is certainly 

 incorrect, for they are manifestly from Grays. Is it possible that 

 a similar mistake was made in the specimens described bv 

 G. B. Sowerby ? 



In the early days of Geology the importance of recording the 

 exact locality of specimens was too often not recognized, while the 

 rivalry of collectors was frequently the cause of wrong localities 

 being attached to specimens. 



Esa. Montana. (Draparnaud). 



The southernmost record for this species in the Pleistocene; 

 Woodston, Orton Waterville, and the Cambridge gravels being the 

 only other localities. 



1 Ann. Nat. Hist. vol. vii (1841) p. 429. 

 Q. J. G. S. No. 316. 2 u 



