46 



THE 'derived' fossils. 



Cyrena rugosa, Sby. 



Area, or Macrodon. 



Pholadidea. 



Astarte 1 (a Portlandian species). 



„ cuneata, Sby. 

 Terehratida ovoides, Sby. 



„ „ var. reXf Lan- 



kester. 

 JSerpula tricarinata, Sby. (attacl^ed 



to Belemnites explanatus, Phill.). 

 Column of Crinoid {Apiocrinus 1). 

 Millericrinus % 



Hemicidaris intermedia, Flem. 

 Pseudodiadema hemisphericum Ag. 

 Cidaris Jlorigemma, Phill. 



Echinohrissus scutatus, Gmel. 

 Holectypu8 depressus, Lam. 

 Ghjpticus hieroglyphicus, Goldf. 



Vertebrates : — 



SphcErodus gigas, Ag. 



Fycnodus. 



Gyrodus. 



Strophodus. 



Hyhodus. 



Asteracanthus. 



Plesiosaurus, several species. 



Pliosaurus, several species. 



Ichthyosaurus. 



Dakosaurus. 



IT. The 'Derived' Fossils of Brickhill. 

 Those marked with a star (*) are not known to me from TJpware. 



Belemnites. 

 Ammonites hiplex, Sby. 



„ the Ox- 

 ford Clay variety. 

 Ammonites giganteus, Sby. 1 



„ Lamherti, Sby. 



Turbo, sp. (from the Kimmeridge 



clay). 

 Pleurotomaria reticulata, Sby. 



spp. 

 Natica. 

 Chemnitzia, 

 Aporrhais. 

 Lima. 

 „ Icemuscula^ Sby. 1 

 *Gervillia aviculoides, Sby. 

 Area, sp. 

 ,, concinna, Sby. 

 "^ Astarte Uartwelliensis, Sby. 



„ cuneata, Sby. (of the 

 Swindon series). 

 Astarte, sp. 

 *Myacites recurva^ Phill. 

 sp. 

 Modiola (Portlandian, sp.). 

 * „ hipartita, Sby. 

 Cythercea. 



Thracia depressa, Sby. 

 Cardium striatulum, Sby. 

 Lucina. 

 Myacites. 



'^Myoconcha Scemanni. 



„ Portlandica 1 Blake. 



Pholadomya Phillipsii, Morris. 



,, ovalis, Sby. 



Cyrena (Cythercea) rugosa, Sby. 



of the Purbeck Oolite. 

 Trigonia gibhosa, Sby. 

 „ incurva, Sby. 

 sp. 

 Rhynchonella varians, var. sociale, 



Dav., of the Jurassic clays. 

 Rhynchonella, 2 sp. 

 Terebratula ovoides, Sby. 



Vertebrates, Fish : — 



Asteracanthus. 



Sphenonchus. 



Pycnodus. 



SphcBrodus gigas, Ag. 



Edaphodon. 



Otodus 1 vertebrae of. 



Beptiles : — 



Dakosaurus. 

 Ichthyosaurus. 

 Pliosaurus. 

 Plesiosaurus. 



Fossil wood : — 

 Silicijied. 



