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STRATA IN THE NEIGHBOURHOOD OF LOKDO^T. 



TerebTatula 

 spondylodef. 



Another io«;t 

 sheU, ostrcu 

 detbrmis. 



Another, a 

 ▼olute. 



stance of their being generally found in the mutilated state, 

 in which they are liere figured by Lister. Besides, neither 

 ©f Lister's specimens at all agrees with the pellucid shell» 

 with a triangular foramen, of anomia psittacea ; but they all 

 agree with the oval antiquated shell, with an obtuse canali- 

 cnlated beak, of anomia spond^lodes. 



In consequence of this agreement, it seems proper to con- 

 sider this fossil shell as forming the species anomia spondy" 

 lodes. But as the channelled beak is not natural to it, l^ut 

 is the consequence of injury ; and as this part, in its natural 

 »tate, is pierced with a large round foramen, a correspon- 

 dent change should be made in the description, and it may 

 be placed under the more appropriate genus of terebratula, 

 as terebratula spondylodes, with an oval antiquated shell, 

 the beak pierced by a large round foramen. 



This shell is, in general, about an inch and a half long, 

 thick, nearly oval, roughly striated transversely, and 

 has its large foramen detined by a distinct border. 

 It appears to differ from every known recent or fossil 

 terebratula. 



Another of the probably lost shells of this stratum is the 

 fossil oyster, figured Organic Remains, &c., vol. HI, pU 

 XIV, fig. 3 ; and which is there conjectured to be the same 

 oyster, as that which is described by Lamarck as ostrea 

 deformis. 



Tha volute. Organic Remains, vol. Ill, pi. V, fig. 13, is 

 «nother shell beloui^ins: to this stratum, of which it is be- 



Reverse«i 



i»b«lk. 



ovate and rather fusiform shell appears to have been 

 smooth; and at its full size about four inches in length; 

 the colunu-lla 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 liji, or of the termina- 

 tion of the spire. 



The Essex reversed tohclkt as it has been termed, murex 

 C07itrarius Linn. Hht. Conch, pf Lister, tab. 950, fig, 44, 

 h, e, which is here very abundant, does not appear to be 

 known in any other straturo of the island; The fossil shell, 



with 



