J 38 On some of the Strata in tlie Neighlourkood of LondoUf 



ovate and rather fusiform shell appears to have been smooth; 

 and at its full size about four inches in length : the colu- 

 mella has four folds, and the shell is formed by about six 

 spiral turns, the last of which makes two thirds of the shell, 

 dilating at about its centre, and contracting nearly equally 

 upwards and downwards. The specimens yet seen give no 

 opportunity of judging of the lip, or of the termination of 

 the spire. 



The Essex rer'arsed whelk, as it has been termed, Mu' 

 rex conlrarii/s, Linn. Hht. Conch, of Lister, tab. 950, 

 fig. 44. b. c. which is here very abundant, does not appear 

 to be known in any other straiuni of the island. The fos- 

 sil shell, with the whirls in the ordinary direction, is some- 

 times found in this stratum*. 



It has been said that the recent analogues of both these 

 shells are found in the adjoining sea. A recent shell is indeed 

 found, which very nearly agrees with the ordinarily turned 

 shell in its general characters : but there appears no authority 

 for supposmg that the analogue of the left turned variety 

 has been discovered there. 



Among those recent shells, the resemblance of which to 

 tlic fossil ones of this stratum is such as appears to render 

 a comparison by an experienced conchologist necessary, 

 may be enumerated • 



Patella uniiaric a, Patella miUlaris, Vatella sinensis, [Ca- 

 lyfjircea, Lain.) Potella fissiira, {En)argi7mla, Lam.) one 

 or two species of Patellce, wuh a perforation in the apex, 

 {Fiss7irella, h&m ) Nerita glaitcina^ Nerita cavrena, {Na- 

 tica. Lam.) Turbo terehra, {Turritella, Lam.) Murex Cor- 

 nells, Murex erinaceiis, Slrombus pes fjelicani, Cyprceu pedi- 

 culus, with no sulcus along the back, P kolas crispatus, in 

 fragments, Solen ensis, and Soleji siliqua, in fragments, 

 Cardlum cdale , Cardium acutealtnnP 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; JSkuIra solida, I'enus exolctn, Fenus scotica ? 

 Venericardia senilis , Lam. Area gli/cemeris, Area vncleus. 

 ,. Besides these remaitis of maiine animals, the fossil hollow 

 tubercles, havinsr lost the spines, of the tkornhack are here 

 found ; aUo fragimiils oi' [hi f;>s'iil palate, [Scapula liitoralis 

 of Lhwvdd) and fossil remains oi .sponge and alcyonla, par- 

 ticularlv a vciv fiir spcciiiun of iho. reticulated alcyonium. 

 Org. Rem. vol. ii. pi. ix. fig. 9- 



* It is erroncinisly si Jted, Or};-anic Urniains, vol iii. p. Cfi, that tliis shell 

 J.as not been yrt nicntii ned, at four.d in this s-traturn; fluce it h so particii- 

 Jarised by Dale, 



