fOSSIL FAUNA. 135 



PLATE LVIII. 



Fossil Shells. 



Fig. 1. " Part of a hexahedral Serpulite." — Mr. Parkinson. 



Fig. 2. A silicified mass of delicate filiform serpulse, from the upper greensand of Devonshire 



{Serpula fiUformis, of Sowerby). 

 Fig. 3. Portion of a species of Siliquaria, from tertiary strata, France. It is the shell of an 



Annelide related to Dentalium. 

 Fig. 5. A spiral Serpulite (it resembles the Serpula conica) ; probably from the cretaceous beds 



of the Isle of Eugen. 

 Fig. 6, is a piece of polished sandstone, from the upper greensand of Wiltshire, " the 



markings on which are produced by sections of a species of Serpula {Vermetus 



concavus, of Sowerby)." — Mr. Morris. 

 Fig. 7. A species of Vermetus ; from Bayonne? 

 Figs. 8, & 9. A species of Vermetus which abounds in the coarse arenaceous limestone of 



Bognor Rocks, in Sussex [Vermetus Bognoriensis, of Sowerby). 

 Fig. 10. " A section of the shell of a Nautilus, to show that the siphuncle sometimes suffered 



distension." — Mr. Parkinson. 

 Fig. 11. A species of Serpula {Serpula ampullacea, of Sowerby), from the chalk of Kent. 

 Fig. 1 2. A fragment of the back or dorsal part of the shell of a fossil Nautilus {Nautilus centralis, 



of Sowerby), from the London clay, Brentford. The outer shell is broken away, 



and the siphuncle, traversing five of the septa of the chambers, is exposed. 

 Fig. 13. " The outline of the back of a Nautilus." — Mr. Parkinson. 

 Fig. 14. An Orthoceratite (Orthoceras annulatum, of Sowerby; 0. undulatum, of Kissinger), 



from the Wenlock Limestone, Dudley. 

 Fig. 15. A fragment of a fossil Nautilus {Nautilus Parkinsoni, of Mr. Edwards), from the 



London clay of Harwich. It shows the situation of the siphuncle and the form 



of the septa, as indicated by the sinuous transverse lines. 

 Fig. 1 6. A polished section of a Nautilus {N. truncatus, of Sowerby), from the Inferior Oolite 



of Yeovil, Somersetshire. The chambers are filled up with crystalline limestone, 



with the exception of the six outermost cells, in which are left hollows that are 



lined with calcareous spar. 

 Fig. 17. Polished section of an Orthoceratite, from the Silurian strata of Oeland, Sweden. 

 Fig. 18. The discoidal part of a Lituite from the same locality as fig. 17. 

 Fig. 19. a polished slab of grey marble, from the Devonian formation of the Rhine. The 



figures are sections of Orthoceratites, a ; and Lituites, b. 



