312 THE ZOOLOGIST. 



W. A. Shaw has found it in a post-Pliocene deposit at Kingley 

 Vale, West Stoke (1912). 



Var. albocincta, Cockerell. — Aruberley Castle (D. Taylor) ; 

 Winchelsea (Rufford Collection, Hastings Museum). 



Var. rubens, Moquin-Tandon. -Near Lewes (Jenner) ; Win- 

 chelsea (Rufford Collection). 



Var. alba, Moquin-Tandon. — Lewes (C. H. Morris and W. C. 

 Unwin) ; Winchelsea (Rufford Collection) ; Eastbourne (Hastings 

 Phil. Soc.) ; Chanctonbury Ring (E. W. S.) ; Heyshott Down 

 (E. W. S.) ; West Stoke, near Chichester (Rev. W. A. Shaw). 



Acanthinula aculeata, Miiller. — Widely distributed. Speci- 

 mens in the Haslemere Museum were collected at Hastings by 

 F. Townsend in 1850. There are numerous records from both 

 divisions of the county. 



Vallonia pulchella, Miiller. — Probably generally distributed, 

 but the numerous published records of its occurrence at Lewes, 

 Hastings, and Eastbourne, and about Harting and Chichester, 

 were made before the form with excentric umbilicus (V. excen- 

 trica, Sterki) was raised to specific rank. 



V. costata, Miiller. — According to Dr. Sterki the presence of 

 very fine raised revolving lines on the nucleus of the one and a 

 half embryonal whorls distinguishes this species from V. pulchella, 

 in which the nucleus is smooth. East Hill, Hastings (A. J. 

 Alletsee) ; Eastbourne and Lewes (Jenner) ; Steynings (Rev. 

 C. E. Y. Kendall) ; Chanctonbury Ring and Heyshott Down 

 (E. W. S.) ; West Stoke, near Chichester (Rev. W. A. Shaw), 

 about Ifield and Rusper (E. W. S.). 



V. excentrica, Sterki. — Formerly confused with V. pulchella, 

 from which it differs in the markedly excentric and less open 

 umbilicus, and the more impressed sutures of the inner whorls. 

 Near Kingley Vale, Chichester (Rev. W. A. Shaw) ; Verdley, 

 near Midhurst (E. W. S.). 



Helicodonta obvoluta, Miiller. (Plate III.) — This species, being 

 of exceptional interest, the records of its distribution in Sussex 

 require consideration in detail. It is of Lusitanian origin. Its 

 range in Britain at the present time is the South Downs over a 

 tract in Sussex and Hants about thirty-five miles in length, and 

 about six miles in breadth. It is not dispersed entirely over that 

 area, but occurs in isolated colonies ; in some spots only dead 



