INFERIOR OOLITE AMMONITE-ZONES. 



157 



Cephalopoda. 



Stepbanoceras Orbignianum, Wright. 

 Humphriesianum, Sow. 

 — Sowerbii, Mill. 



Chemnitzia Sremaiini, Oppel. 



— lineata, Sow. 



Turbo laevigata, Sow. 



Ostrea flabelloides, Lamk. 



— large flat, new species. 

 Hinnitea tuberculosus, Gold/, 

 Lima proboscidea, Sow. 



— Etheridgii, Wright. 



— duplicata, Soiu. 

 Tricbites undulatus, Lye. 

 Astarte excavata, Sow. 

 (^yprina (mould). 

 Cypricardia cordiformis, Desh. 

 Myacites calceiformis, Sow. 



Stepbanoceras Brocchi, Sow. 



— Braikenridgii, Sow. 



Nautilus lineatus, Sow. 



Gasteropoda. 



Pleurotomaria fasciata. Sow. 



— elongata, Sow. 



— constricta, Deslong. 



Lamellibranchiata. 



Gervillia consobrina, d'Orb. 

 Mytilus explanatus, Mor. 

 Pholadomya Heraulti, Agass. 

 Homomya crassiuscula, Lye. 

 Myoconcba crassa, Sow, 

 Pteroperna plana, Lye. 

 Trigonia costata, Sow. 



— striata, Sow. 



— decorata, Agass, 

 Modiola imbricata, Sow. 

 Pinna fissa, Phil. 



No. 6. The Oyster-hed consists of a coarse, brown, ferruginous, sandy marl, with 

 inconstant layers of hard rock, which breaks up unequally. It is chiefly in the sandy 

 seams that the fossils are found. The bed is about a yard in thickness. The bottom 

 is seldom exposed, as it is mainly for the roadstone that the working is cari'ied on. It 

 contains : 



CONCHIFERA. 



Ostrea flabelloides, Lamk., and several well- 

 marked varieties of the species. 



— pyxifomiis, Wright. 

 Pecten demissus. Gold/. 

 Lima proboscidea, Soio. 



— Etheridgii, Wright. 

 Monotis tenuicostata, Wright. 



Serpula grandis, Goldf. 



Clypeus Michelini, Wright. 

 Stomechinus germinaas, Phil. 



Gresslya abducta, Phil. 

 Pleuromya tenuistriata, Agass. 

 Pholadomya Heraulti, Agass. 



— ovulum, Agass. 



— media, Agass. 



— Dewalquei, Lye. 



Annulosa. 



Serpula Umax, Goldf. 



ECHINODERMATA 



Pseudodiaderaa depressum, 

 Acrosalenia Lycetti, Wright 



