1847V] PRESTWICH ON THE BAGSHOT SANDS. 389 



been informed however, by the labourers in some of the sand-pits 

 on the hills west of Egham, that they have occasionally found speci- 

 mens which I presume from their description to be casts of shells. 



In the middle or green sand division also organic remains are gene- 

 rally very scarce, yet there are a few localities in which casts and im- 

 pressions of shells occur in some abundance. On the south slope of 

 the hill at Chobham Place are to be found, as mentioned by Mr. 

 Warburton, numerous, but generally very imperfect, impressions of 

 shells in a stratum of clayey green sand. 



Very perfect and solid casts of a large Venericardia, and of a few 

 other bivalves, are abundant in the green sand beds exposed in a slight 

 cutting in a descent of the road midway between Bagshot and Chert- 

 sey*, and again at Knowles Hillf . It was however in the railway 

 cuttings at Goldsworthy and Shapley Heath near Winchfield that I 

 obtained the best specimens (see fig. 3. p. 382, stratum "4. 5"). 



The well-preserved specimens above-named from near Long Cross, 

 although numerous, being with scarcely an exception interior casts, 

 I was long unable to determine any of the species. The exceptional 

 case is a specimen given to me by Dr. Stanger. In this instance one 

 valve of the shell remains attached to the cast. Although much eroded, 

 it is sufficiently perfect to determine its species J (V. planicosta). 



At Chobham Place, the stratum being more clayey and compact, 

 many of the impressions of the exterior of the shells are preserved 

 with a few casts of the interior. Of these some few are sufficiently 

 well-marked to be identified. At Goldsworthy the specimens were 

 in the state of pjritical casts of the exterior of the shell. I have 

 been enabled to recognize three species. At Shapley Heath, how- 

 ever, the shells were in most instances preserved, but in so friable a 

 state that it was extremely difficult to obtain perfect specimens. 



The evidence supplied by these few determinable species, although 

 so limited, is for its extent the strongest which could have offered ; 

 for amongst the most abundant and typical fossils of Bracklesham 

 Bay, and of the corresponding beds at White-Cliff Bay and South- 

 ampton, stand the Venericardia planicosta, Turritella sulcifera and 

 Nummulites Icevigatus, and these are precisely the species best deter- 

 mined in the above-mentioned specimens from the middle division of 

 the Bagshot sands. The shell of which the cast occurs the most 

 abundantly in the green sands at the places above-named is, there is 

 little doubt, the Venericardia planicosta. 



The genus, and sometimes the species of a few other specimens, 

 are also determinable. The following list exhibits all the organic 

 remains that I have been able to collect, with their localities in the 

 Bagshot district, and their position in the Hampshire series : — 



J* Three-quarters of a mile west from a spot called Long Cross. Mr. D. Mum^^ 

 ford of Chobham pointed out this locality to me. 



f Four miles west of Chertsey. r,,-? 



t I have worked out a large number of specimens, but not a trace of shell re-^ 

 mained on any of them. The one named above was, I believe, found by the Rev. 

 Mr. Jerome of Chobham. 



