211 



ON THE NON-MAEINE MOLLUSCA OF A POST-PLIOCENE DEPOSIT 

 AT APETHOEPE, NOKTHAMPTONSHIEE. 



By A. S. Kennakd, F.G.S., and B. B. Woodwaed, F.L.S., etc. 



Read 11th December, 1914. 



We have twice recorded Vertigo parcedentata (A. Braun) as occurring 

 in a fossil state at Stamford, Lincolnshire (Proc. Malac. Soc. Lond., 

 vol. vii, pp. 119-20, 1906, and Quart. Journ. Geol. Soc, vol. Ixviii, 

 p. 236, 1912). This record was based on examples which had been 

 found in shell marl given to one of us some years ago by the late 

 Professor T. Rupert Jones, the box containing the marl being 

 labelled "Stamford, from S. P. Woodward". In the course of 

 correspondence with Mr. W. R. Horwood, of the Leicester Museum, 

 he kindly pointed out that this is without doubt the material 

 described by the donor in 1881. The account is as follows : 

 " From the grey marl of an old lake-floor in a valley near Apethorp, 

 not far from Stamford, on which a Roman station (discovered in 

 1859) had been established, though subject to inundation ; the 

 following freshwater shells and other organisms were found by 

 Mr. John F. Bentley. They were named by Dr. S. P. Woodward," 

 and a list of thirty-two species is given (Proc. Geol. Assoc, vol. vi, 

 p. 213, footnote, 1880). 



Although the amount of material was small, yet we have been able 

 to determine thirty-eight species, viz. : — 



Vitrea crystalUna (Miill.), 6 examples. 

 Polita cellaria (Miill.), 7 examples. 

 P. radiatiila (Alder), common. 

 Zonitoides nitidus (Miill.), 1 example. 

 Enconulns f ulcus (Miill.), 5 examples. 

 Punctuin pygmcenin (l)rap.), 10 examples. 

 Pj/ramidula rutundata (Miill.), common. 

 ITelicella itala (Linn.), 2 examples. 

 Ilygromia liherta (West.), common. 

 Aca7ithinula aculeata (Miill.), 5 examples. 



Vallonia pulchella (Miill.), common. 



V. costata (Miill.), common. 



V. excentrica, Sterki, common. 



Arimita arbustorum (Linn.), 4 examples. 



Cochlicopa luhrica (Miill.), common. 



CfBcilioides acicula (Miill.), 4 examples. 

 Papilla muscormn (Linn.), common. 



Vertigo antivertigo (Drap.), 10 examples. 



V. substriata, Jeff., 4 examples. 



V. pggmcea (Drap.), 5 examples. 



V. parcedentata (A. Braun), common. 



V. piisilla, Miill., 1 example. 



V. angicstior, Jeff., 1 example. 



