152 Mr Taivney, On the Upper Bagshot Sands of [Nov. 28, 



Edwards' Lower Headon species. The type of Edwards' species 

 occurs in the Lower Headon, but we have not seen it from the 

 M. Headon. 



C. speculatum, Ed. MS. This name is founded on a single 

 imperfect specimen in the Edwards collection ; it seems to us 

 probably identical with C. tricarinatum, Lam., which occurs in the 

 Mortefontaine beds; if so it would be another connecting link 

 between that horizon in France and our Upper Bagshot sands. 



C. deperditum, Lam. Edwards identified a few specimens in 

 his collection from the Long Mead End bed as Lamark's species ; 

 we have collected one also this year, and refer it to this species 

 which occurs in the Mortefontaine beds. 



G. cavatum, Ed. MS. A single example from the Long Mead 

 End bed in the Edwards collection has this appellation given to it, 

 but it is evidently only a smooth variety of the C. pleurotomoides, 

 Lam. 



[C. margaritaceum, var. recentius. One specimen so labelled 

 by Edwards is in his collection as from Long Mead End ; it comes 

 from a green sandy bed, but evidently not from the Upper Bagshot.] 



Melania hordacea, Lam. A small Melania is very common in 

 the Long Mead End bed; Edwards has determined it in his 

 collection as M. fasciata, Sow. We consider it however nearer to 

 Lamark's species, and can find no point in which it differs there- 

 from. It is entirely without the cross ridges or tubercles which 

 ornament the young whorls of M. fasciata. Moreover the aperture 

 in this species is much narrower than in the Long Mead End 

 shell, and the whorls are rather natter, having even a slight 

 depression near the suture in the last whorl corresponding to the 

 base of the tubercular ridge in the young whorls. Even when the 

 shells are corroded as they usually are in the Long Mead End bed, 

 the form of the aperture is distinctive. 



M. fusiformis, Sow. Not uncommon in the Long Mead End 

 bed, passes up through Lower to M. Headon. 



Bulla Lamarkii, Desh. Two examples identical with ours are 

 so identified by Edwards in his collection. This species has not 

 been found yet above the lower beds (Brockenhurst beds) of the 

 M. Headon. 



Nucula tumescent, Edw. In Wood's Eocene Bivalves, p. 121, 

 said to be from Long Mead End and Barton on Edwards' autho- 

 rity; this Barton locality is the Beacon Bunny bed usually 

 considered the top bed of the Barton ; we have collected it our- 

 selves from this bed. It is not known as yet further down in the 

 Barton, neither does it pass up into the Headon beds. 



[Lucina inflata, Ed. MS. A shell is so determined by Edwards 

 in his collection from Long Mead End and Barton, is quite 

 different from individuals from the Headon beds of Headon Hill. 



