STRATA IN THE NEIGHBOURHOOD OF LONDON. > 47 



with the whirls in the ordinary direction, is sometimes found 

 in this stratum*. 



It has been said, that the recent analogues of both thes^e 

 siiells are found in the adjoining sea. A recent shell is in- 

 deed found, which very nearly agrees with the ordinarily 

 turned shell in its general characters : but there appears no 

 authority for supposing, that the analogue of the left- 

 turned variety has been discovered there. 



Among those recent shells, the resemblance of which to Fossil shells ©t 

 *^ . this stratum to 



the fossil ones of this stratum is such as appears to render u be compaied 

 comparison by an experienced conchologist necessary, may wtlwecent 

 be enumerated : 



Patella vngarica, patella militaris, patella sinensisy 

 fcalyptrcea,. Lam.) patella fissura, femarginula, Lanu) 

 one or two species oi patelice, with a perforation in the apex, 

 (fismrella^ Lam.) nerita glaucinn, nerita canrena, fnaticay 

 Lara.) turbo terebra, /'tiirritelia. Lam.) murex corneus, 

 murex erinacettSt stromhus pes pelicani, ajprcea pedictUuSt 

 with no sulcus along tlie back, pholas crispatus, in frag- 

 ments, solen ensis, and solen siliqua, in fragments, cardium. 

 edule, cardium aculeatum ? bearing the size and form of this 

 shell, but having from thirty-four to thirty-six ribs, with no 

 depressed line down their middle, nor vestiges of spines ; 

 mactra solidot venus exoleta, venus scotica? venericardia 

 senilis. Lam., area gh/cemeris, area nucleus. 



Beside these remains of marine animals, the fossil hollow Other m^Kine 

 tubercles, having lost the spines, of the thornhack are here 

 found ; also fragments of the fossil palate, ( scapula littoraUs 

 of Lhwydd) and fossil remains of sponge and alcyonia, par- 

 ticularly a very fair specimen of the reticulated akyonium. 

 Org. Rem., vol. II, pi. IX, fig. 9. 



In this bed, among the gravel and the shells, are fre- Peculiar frag- 

 qiiently found fragments of yiiwi/ io«e, which possess some "'^^''^ °^ ^°="**' 

 striking peculiarities. They are seldom more than half an 

 inch in thickness, two inches in width, and twelve in length ; 

 always having this flat form, and generally marked with 

 small dents or depressions. Their colour, which is brown, 



• It is erroneoufly stated. Organic Remains, vol. Ill, p. 66, that 

 thii shell has not been yet inenAioned, a? found 'n this ittatum ; since 

 it is s<j patticulari^ed hy Dale, 



licht 



