KENNARD & WOODWAEB : OIST HOLOCENE MOLLUSCA. 93 



II. Wallingford, Berks. 



We are indebted to Mr. H. J. Osborne White for the material and 

 the details of this section. It is exposed in a boat slip about 100 yards 

 north of Wallingford Bridge on. the Oxfordshire side, but is within the 

 Berkshire boundary, which here crosses the river. The section shows — 

 (a) Shelly loam, about 4 feet thick at the highest part of the bank, 

 near the stream, resting on {b) fine sandy gravel with shells just 

 showing above the water-level. 



This bed also yielded remains of ox, horse, and probably sheep. 

 Molluscan remains are abundant in the bed a, and of these we are 

 able to compile a list of twenty-six species, viz. — 



Agriolimax agrestis (Linn.), 2 examples. P. vortex (Linn.), 1 example. 



Vitrea crystallhia (Miill.), I example. Bithynia tentaciilata (Linn.), common. 



V. nitidula (Drap.), 1 example. B. LeacMi (Shepp.), 4 examples. 



Avion ater (Linn.), common. Valvata piscinalis (Miill.), common. 



Hygromia hispicla (Liiin.), 6 examples. V. cristata, Miill., 2 examples. 



Vallonia pulchella (Mi.ill.), 3 examples. Neritinajliiviatilis (Linn.), common. 



Helicigonaarbustorum{\jmn.), le^'um.'^lQ. Unio tumidits, Retz., 1 valve. 



Cacilioides acicula (Miill.), 1 example. Sphcerium corneiim (Linn.), 10 valves. 



Ancylus fluviatilis, Miill., 1 example. Fisidmm amnicwn (Linn.), 4 valves. 



Limnaa auriciilaria (Linn.), 1 example. F. supinum, A. Schm., 16 valves. 



Z. pereger (Miill.), 1 example. P. Henslowianiim (Shepp.), 3 valves. 



Planorbis albus, Miill., 3 examples. P.0asertanum(2(Ai)\_ = cinereum,K\Aey:'\? 

 P. Strcemii, West., 8 examples. 3 valves. 



P. crista (Linn.), 2 examples. 



Bed a, judging from its constituent material and the contained 

 mollusca, has been gradually accumulated during repeated floods, and 

 is in all probability being continually added to. The mollusca form 

 a typical Thames Holocene group, all the characteristic species being 

 present. We would again draw attention to the presence of Planorbis 

 Stroemii as showing the formerly widespread distribution in the 

 Thames basin of this form, now quite extinct in England. 



Of bed b, owing to its position, we have not been able to procure so 

 much material as from bed «, hence our list of the included mollusca is 

 smaller, comprising only sixteen species, viz. — 



Hygromia hispida (Linn.), 1 example. Valvata piscinalis (Miill.), common. 



Snccitiea elegans, Ris.-^o, 1 example. Neritina fluviatilis (Linn.), common. 



Acroloxus lacustris (Miill.), 1 example. Anodonta cygnma (Linn.), 2 fragments. 



Limncea pereger (Miill.), 2 examples. Sphcerium corneum (Linn.), 1 valve. 



Planorbis Strcemii, West., 1 example. Pisidium amnicnm (Linn.), 1 valve. 



P. carinatus, Miill., 1 example. P. Henslowianum (Shepp.), 1 valve. 



Bithynia tentaculata (Linn.), common. P. Casertanum (Poli) [_ = cinereum,Ald.ei'\, 

 B. Leaehii (Shepp.), 4 examples. 1 valve. 



Vivipara vivipara (Linn.), 4 examples. 



This bed is undoubtedly a true stream deposit, and has been laid 

 down in the channel of the river. None of the species calls for any 

 extended notice. 



III. Caversham, Oxfordshire. 



We are indebted to Mr. L. Treacher for our knowledge of this 

 deposit, which is situated about 200 yards below Caversham Lock on 

 the Berkshire bank of the Thames. The section shows — 



VOL. VIII. — JUNE, 1908. 8 



