148 On some of the Strata in the Neighloiirhood of London, 



of pecten in the English chalk ; besides a shell, with long 

 sleiiflcr spines, which may be satelv classed with the pecten. 

 A Crania {Anemia craniolaris Linn. Crania personata 

 Lam.) This fossil is not known in the Engli-h chalk ; nor 

 indeed could it be easily ascertained, unless the interior 

 valve happened to be well displaved. 



Three TerebratidcB . T. sulcata and a terebratula agree- 

 ing with ylnomia terebratula Linn, are frequently found in 

 our clialk ; and sometimes another species, hardly half an 

 inch in length, with remarkably acute and well defined 

 ribs. 



A Spirorhis, Traces of these shells are frequently found 

 on the surface of the echinitce. 



Ananchltte {Echimis ovatus). The crustaceous covering 

 of which, it is remarked by MM. Cuvier and Brongniart, 

 remains calcareous, and has assumed a sparry texture, whilst 

 the niiddlc alone is chan2,i:d into silex. No actual change 

 has however taken place, as far as respects the flmty 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 difi'erent fossil bodies called by the French 

 oryctolo^ists Polypiers, one appearing to belong to the 

 genus CaryophyUcEa. Several of these bodies, from the 

 English chalk, have been figured in the Org. Rem. vol. ii. 

 pi. xiii. fig. 70 to 79. 



Another is supposed to belong to the genus Millepora. 

 This is generally brown, and is in the state of oxidized iron, 

 iis resulting from the decomposition of pyrites. These fos- 

 sils exist in the Wiltshire soft chalk. 



Lastly, Shark's teeth. These also occur frequently in the 

 English stratum. 



Messrs. Cuvier and Brongniart state, that there are many 

 more fossils in the chalk stratum of France than those 

 which have been just referred to. This is also the case 

 with the fossils of the English chalk ; since the following 

 may be enumerated as occurring in this stratum. Rugom 

 palates, and, though rarely, the scales OLnd. vertehrcs of fishes. 

 Three or four species of slellcE marince. A long saccular 

 liualve, with an uncommonly thin shell, of which so little 

 has beeit hitherto saved, as not to give a chance of gaining 

 a knowledge of its general form, or the structure of its 

 hino-e. A llvalve^ which approaches to a circular form, 

 but IS so thin as to afford but little hope of discovering its 



genuii. 



