CHAP. VI. 



OF FOSSIL-SHELLS, AND OTHER ANIMAL AND 

 VEGETABLE EXUVIAE. 



BOTH Litoraks and Pekgia, or fhore and ocean-fhells, are not 

 unfrequently found foffil with us. We have alfo fame of 

 thofe that are called anomalous^ from their being found no where 

 but in a foiEl-flate. 



I lhall begin with the Univalves: 



1. The convex umbilicated Turbo fa). From a bank of blue 

 clay above the bridge at Simonburn, where I met with two of them, 

 one of which was fo tender that I broke it in taking out, both 

 nearly of the fame fize, and cinereous. 



2. A fmaller, of an ochreous red tinge, in a mafs of iron-ftone 

 of the fame colour. From the fhore of the brook at Gofton, near 

 Wark, in Tynedale.. 



3. A variety of it, fmall, fmooth, and cinereous j immerfed 

 in great numbers, and in various directions, in a fmall flone from 

 the fhore of North Tyne t below Chipchace-mil\. ' 



(a) Tefta convixa, vix perfefle conica, fubtiis profunde umbilicata ad modum trochi 

 telefcopii. Linn. Syft. Nat. p. 760. n. 521. 



Turba tefta umbilicata convexa, anfradtibus teretibus ftriatis : ftriis crenulaiis inequalibos. 

 Foff. Hantonienf. PI. i. Fig. 8. 



4. An 



