46 



THE 'DERIVED' FOSSILS. 



Cyrena rugosa, Sby. 



Area, or Macrodoa. 



Pholadidea. 



Astarte 1 (a Portlandian species). 



,, cuneata, Sby. 

 Terebratula ovoides, Sby. 



,, ,, var. rex, Lan- 



kester. 

 Serpida tricarinata, Sby. (attached 



to Belemnites explanatus, Phill.). 

 Column of Criuoid (Apiocrimts 1). 

 Millericrinus 1 



Hemicidaris intermedia, Flein. 

 Pseudodiadema hemisphericum Ag. 

 Cidaris florigemma, Phill. 



Echinobrissus scutatus, Grael. 

 Holectypus depressus, Lam. 

 Glypticus hieroglyphicus, Goldf. 



Vertebrates : — 



Stphcerodus gigas, Ag. 



Pycnodus. 



Gyrodus. 



Strophodus. 



Hybodus. 



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 Upware 



* Myoconcha Scemanni. 



Belemnites. 

 Ammonites biplex, Sby. 



„ „ „ the Ox- 



ford Clay variety. 

 Ammonites giganteus, Sby. 1 



,, Lamberti, Sby. 



Turbo, sp. (from the Kimmeridge 



clay). 

 Pleurotomaria retiexdata, Sby. 



„ spp. 



Natica. 

 Chemnitzia. 

 Aporrhais. 

 Lima. 



„ lobviuscula, Sby. ? 

 *GervilUa aviculoides, Sby. 

 Area, sp. 



,, concinna, Sby. 



* Astarte Hartwdliensis, Sby. 



„ cuneata, Sby. (of the 

 Swindon series). 

 Astarte, sp. 

 *Myacites recurva, Phill. 

 sp. 

 Modiola (Portlandian, sp.). 



* „ bipartita, Sby. 

 Cyther&a. 



Thracia depressa, Sby. 

 Oardium striatidum, Sby. 

 Lucina. 

 Jfyacites. 



Portlandica ? Blake. 

 Pholadomya Phillipsii, Morris. 



,, ovalis, Sby. 



Cyrena {Cytheroza) rugosa, Sby. 



of the Purbeck Oolite. 

 Trigonia gibbosa, Sby. 

 „ incurva, Sby. 

 sp. 

 Rhynchonella varians, var. sociale, 



Dav., of the Jurassic clays. 

 Rhynchonella, 2 sp. 

 Terebratula ovoides, Sby. 



Vertebrates, Fish : — 



Asteracanthus. 



Sphenonchus. 



Pycnodus. 



Sphcerodus gigas, Ag. 



Edaphodon. 



Otodus 1 vertebrae of. 



Reptiles : — 



DaTcosaurus. 

 Ichthyosaurus. 

 Pliosaurus. 

 Plesiosaurus. 



Fossil wood : — 

 Silicijied. 



