HOPKINS CAMBRTDGE ESSAYS : GEOLOGY. 



Freestone and Sant)stone Beds. 



Sponges — many varieties 

 Siphonia, sp. 



Belemnites lanceolatus ( ?) 

 Pectines, sp. — rare 

 Ammonites — very large, rare 

 Nautilus elegans — rare 



expansus 

 Sponges, species of 

 Terebratula, sp. — abundant 

 Exogyra, sp. 



Lima — two species or more 

 Wood — several kinds 

 Serpula — several species 

 Hamites — three species 

 Echinus, (?) species of 

 Spatangus, (?) sp. 



Natica, sp. 

 Spines of lish 



Hypsodon Lewesiensis, in British 

 Museum, discovered by the author 

 Pleurotomaria, sp. 



Sharks' teeih and bones, several spe- 

 cies of 



Fish-bones 



Ammonites — three or four species 

 Nautilus, sp. 

 Ostrea carinata 

 Fusus (?j, sp. 

 Astacus (?j, sp. 

 Mya — two species 

 Gervillia — 1\70 species 

 Modiola, sp. 



Malm- BED. 



Ammonites rostratus? 

 Ammonites, other species of 

 Nautilus, sp. 

 Millepora, species of 

 Grrypheea, sp. 

 Inoceramus (?), sp. 

 Serpula — three species 

 Lima — two or three species 

 Crustacean remains 

 Fish-teeth and scales — abundant 

 Sharks' teeth and bones — rare 

 Alcyonia, sp. 

 Sponges, species of 

 Siphonia, sp. 

 Pecten quinque-costatus 

 „ dequicostatus 

 Other species 

 Spondylus, sp. 



Ostrea vesicularis 

 Anomia (?) sp. 

 Inoceramus, large sp. " 

 Pinna, sp. 

 Hamites — large sp. 

 Cardium — several species 

 Trigonia aliformis 

 Panopsea mandibula 

 plicata 



three other species of 

 Actseon, or Tornatella — several specios 

 Wood, fragments of 

 Belemnites minimus (?) 

 Pleurotomaria — two species 

 Natica sjj. 

 Scalaria (?) sp. 



Terebratula — three or four species 

 Coprolites, 



Casts of species of Venus (?), Thetis, Tellina (?), Cytherea, of Trigonia spinosa, 

 T. carinata, and two other species or varieties, and of Mya, Modiola, Rostellaria 

 two varieties, and Mseandrina (?). 



THE SPIPJT OE GOOD BOOKS. 



CAMBEIDGE ESSAYS, 1857.— GEOLOGY : BY W. HOPKIXS, 

 M.A.,E.E.S., E.G.S. 



( Continued frora p. 42 5 . j 



In the preceding exposition the object has been to give, in a condensed 

 form, the leading facts and conclusions of geology. These facts are so 

 firmly established by observation, and the conclusions from them so 

 clearly demonstrated, that every rational mind must assent and be^re- 

 pared to admit the principle on which Geology, like all physical sciences, 



