FOSSILS. ' 
56 
Serpula (Brixton, &c. J. C. B.) 
Trilobus* 
Amplexus (Yealmpton, J. C. B.) 
Scyphia 
Spirifer 
Cerithium 
Pileopsis 
Natica 
Cirrus 
Pleurotomaria 
Euomphalus (Ordnance Quarries, Mr. T. Colley.) 
Turbo 
Turritella 
Pleurotoma 
Murex 
Buccinum 
Belleropbon (Stoneliouse, Mr. Hennah) 
Orthocera 
Terebra 
Nautilus 
Terebratula 
Pecten 
Me gal o don 
Cardium 
Anomia 
Mytilus 
Mya 
Ostrea 
The following are the genera chiefly recognised in the SLATE,— 
those which can with tolerable certainty he named. 
Astrea (Yealmpton and Elburton, J. C. B.) 
(see woodcut) 
Spongia (J. C. B.) see woodcut 
* Trilobites are found in the limestone of the South of Ireland. 
The genus is among the earliest of articulated animals, and is at 
the same time characteristic of the grauwacke series of rocks. 
