264 JOURNAL OF CONCHOI.OGY, VOL. 12, NO. lO. APRIL, I909. 



scattered about on the surface. Some species are very abundant 

 especially Liimuea pereger, Bitliynia ientaculata and Ancylus fluviatilis 

 amongst freshwater shells, and Hygiomia hispida and H. riifescefis 

 amongst land shells. 



The following is a list of the species obtained: — - 



Agrioliniax agrestis (L). Two examples. 



Vitrea crystallina (iMiill.). One example. 



V. cellaria (Miill.). Several. 



V. nitiduhi (Drap.). Several. 



Zonitoides nitidus (Miill.). One example. 



Pyramidiila rotunda (a (Miill.). Several. 



Hyfromia hispida (L.). Abundant. 



H. riifescens (Penn.). Abundant. 



H. granulata (Alder). Scarce. 



Valloiiia exceiitrica Sterki. Several. 



Helix fieiiioralis L. Several. 



H. hofte/isis IMiill. One example. 



Cochlicopa lubrica (Miill.). Common. 



Vertigo pygniaa (Drap.). One exami)le. 



Succinea putris {V,}). One example. 



Carychium tiiinimitm Miill. Several. 



Ancylus fiuviatilis Miill. Abundant. 



Limncea pereger (Miill.). Abundant. 



L. truncatula (Miill.). Three examples. 



Planorbis alb us Miill. Several. 



Bithyjiia ieiitaculata (L). Abundant. 



Wilvata piscinalis (Miill.). Several. 



Sphieriuin comeuni (L.). Several valves. 



Plsidiuni aninicum (Miill.). Several valves. 



P. pusilluni (Gmelin). Several valves. 

 The shells do not present any striking differences from those at 

 present living in the district, and if comparison is made with the lists 

 of species collected about Gisburn and Sawley Abbey by Mr. W. 

 Denison Roebuck in iS8i and 1893^ it will be seen from what 

 region the alluvium shells have no doubt been derived. Out of the 

 twenty-five land species in his lists fourteen are recorded from the 

 alluvium, and of the ten freshwater species nine are represented, along 

 with three others, viz. : — Planorbis albus, Pisidiuin ajunicuin and P. 

 pusilluni, which are not given in his lists. 



No remains other than moUusca were noted in the deposit. It is 

 therefore difificult to arrive at any satisfactory conclusion as to the 

 precise age of the shells. Those from the lowest part of the alluvium 



i Naturalist^ iSSi, p. 159, and 1S94, p. 9. 



