and Fossil Remains near London. 347 



A Muscle. No instance appears in which any shell of this genus 

 has been found in our chalk. 



Two Oysters. The Kentish chalk-pits yield at least three species 

 of this genus. One of them bearing very much the form and 

 appearance of Ostrea edul'is^ but being only about a fourth of its 

 size ; one smaller, the serrated edge of which places it in the family 

 oi Crist ce galli ; and the third still smaller, not half an inch in length, 

 crenulated on each side of the hinge. 



A species oi Pecten. There are two or three small species oipecten 

 in the English chalk ; besides a shell, with long slender spines, which 

 may be safely classed with the pecten. 



A Crania ( Anomia Craniolaris^ Linn. Crania personata. Lam.) 

 This fossil is not known in the English chalk ; nor indeed could it 

 be easily ascertained, unless the inferior valve happened to be well 

 displayed. 



Three Terebratula. T, sulcata and a terebratula agreeing with 

 Anomia terebratula Linn, are frequently found in our chalk ; and 

 sometimes another species, hardly half an inch in length, with re- 

 markably acute and well defined ribs. 



A Spirorbis. Traces of these shells are frequently found on the 

 surface of the echiiiita. 



Ananchita, (Echinus ovatus.) The crustaceous covering of 

 which, it is remarked by M. Cuvier and Brongniart, remains calca- 

 reous, and has assumed a sparry texture, whilst the middle alone is 

 changed into sllex. No actual change has however taken place, as 

 far as respects the flinty part of the fossil, the flint having merely 

 filled up the hollow of the sparry crustaceous covering. This fossil 

 is frequently found in the English chalk. 



Porpitce. These also occur in the English chalk. 



Five or six different fossil bodies called by the French oryctologists, 

 Polypiersy one appearing to belong to the genus Caryophyllaa. Seve- 



2x2 



