KEKNAED & WOODWAED : ON HOLOCENE MOLLUSCA. 



91 



Vitriiia pellucida (Miill.), 1 example. 



Vitrea crystaUina (Miill.), 2 examples. 



V. cellaria (Miill.), 7 examples. 



V. radiatula (Aid.), common. 

 Zonitoides nitidns (Miill.), common. 

 Euconulus fulviis (Miill.), common. 

 Arion ater (Linn.), 5 granules. 

 Punctumpygmcetim (Drap.), 20 examples. 

 Pyramidula rottindata (Miill.), 7 



examples. 

 Sphyrad'mm edentulum (Drap.), 1 



example. 

 Acanthinula aculeata (Miill.), 1 example. 

 Helicclla Itala (Linn.), 3 examples. 

 Hygromia hispida (Linn.), common. 

 H. sericea (Drap.), common. 

 H. Tiifescens (Penn.), 1 example. 



Vallonia pnlchella (Miill.), common. 

 Helix asperm, Miill., 2 examples. 

 H. nciiioralis, lAun., common. 

 Helicif/ona arbnstorum (Linn.), common. 

 Cochlicopa lubrica (Miill.), common. 

 Jainima niKscorum (Linn.), common. 



Vertigo antiverligo (Drap.), 10 examples. 



V. pygmma (Drap.), common. 

 Clamilia laminata (Mont.), 3 examples. 

 C. bidcntata (StriJm), 2 examples. 

 Siiccinea piUris (Linn.), 10 examples. 

 S. elegam, Eisso, common. 

 Caryrhii/in minimum, Miill., common. 

 AncylusJlHviatilis, Miill., 4 examples. 

 Acrolo.vus lacustris (Linn.), 3 examples. 



One young valve of Pisidium Ilendowianum possesses the appendicula, 

 the remainder, although some of the examples are fine specimens, 

 being devoid of it. 



Vitrina pellucida, thoi:gh a very common and widely distributed 

 shell in these Islands, is extremely rare in a fossil state, and here it is 

 only represented by a single young example. 



Hygromia hispida is the commonest helicoid, and as usual is 

 extremely variable, but the larger number ai"e typical hispida 

 (=z co)}citma, Jeff.). We have on previous occasions mentioned the 

 probability of the existence in England of another species of Hygromia, 

 and we are now able to definitely introduce the name of Hygromia 

 sericea, Drap. This is the H. sericea, Drap., of Continental authors, 

 not of Jeffreys, which latter form is the H. granidata^ Alder.' 



Limnma auricularia (Linn.), 3 examples. 



L. pereger (Miill.), common. 



L. palusfris (Miill.), common. 



L. truncatula (Miill.), common. 



L. stagnalis (Linn.), common. 



Flanorbis corneus (Linn.), 7 examples. 



P. albiis, Miill., common. 



P. Strcemii, West., 1 example. 



P. crista (Linn.), I example. 



P. carina ttis, Miill., 8 examples. 



P. umbilicatus, Miill., common. 



P. vortex (Linn), 2 examples. 



P. leitcostoma , Millet, common. 



P. contorius (Linn ), common. 



Physa fontinalis (Linn.), 3 examples. 



Aplecta hypnorum (Linn.), 1 example. 



Paludestrina ventrosa(lAoni.) , 1 example. 



Bithynia tentaculata (Linn.), common. 



B. Leachii (Shepp.), 6 examples. 



Valvata piscinalis (Miill.), common. 



V. cristata, Miill., common. 



Neriiina fluviatilis (Linn.), 5 examples. 



Sphceriiim corneuni (Linn.), 4 valves. 



Pisidium amnicum (Miill.), 10 valves. 



P. Hensloivianum (Shepp.), 14 valves. 



P. pulchellum, Jenyns, 1 pair and 1 



valve. 

 P.Caaertanum (Poll) [ = cj«(re«;«, Alder], 



6 valves. 

 P. Gassiesiaiiuiii, Dupuy, 12 valves. 

 P. pusillum (Gmel.), common. 



Draparnaud was under the impression, as his synonymy shows, that his shell was 

 identical with the If. siricea of Miiller, hut, as first pointed out by Beck in 

 1837 (" Index Moll.," p. 20), and frequently since by other authors, Miiller's 

 shell was a young and hisjiid form of bis //. incarnata. This has been further 

 established by co-types kindly sent us by Dr. A. C. Johansen. Strictly, then, 

 Draparnaud's name cannot stand, but no other name seems available. Studer's 

 H. albnla is too imperfectly defined, while the H. piligera, Ziegler, is a vomen 

 nudum, and U. globularis, Jeff., is a synonym for If. granulata. Under the 

 circumstances we prefer to employ the name in use on the Continent, and to 

 leave it for some future monographer to deal with the question. 



