336 



THE WONDERS OF GEOLOGY. 



Lect. IV. 



which is the finest example known, would, if perfect, exceed 

 two feet in length ; it possesses traces of the siphuncle. 

 Very large hamites and scaphites have been found in the 

 greensand of Kent, Isle of Wight, and other places. The 

 first specimens of turrilites, hamites, and scaphites, from 

 the British strata, were discovered in my early researches, 

 in Hamsey marl-pits, near Lewes.* 



Lign. 66. — Belemnites; one-third natural size. 



Fig. 1. Belemnitella mucronata ;t from chalk, Brighton. On the rightof the figure 

 is a view of the aperture ; and beneath it a transverse section of the belem- 

 nite, showing the radiated structure. 



2. Portion of a Belemnite containing the internal chambered shell, called the 



phragmocone. 



3. Belemnitella quadrata; from Beauvais, France; the quadrangular cavity is 



shown in the upper figure on the left. 



4. Belemnites dilatatus ; from the Greensand, France. 



29. The belemnite. — Among the innumerable relics 

 of marine animals which occur in the secondary deposits, 



* See Sowerby's Mineral Conchology, vol. i. tab. 18. From the 

 recent cuttings through the chalk-marl at Offham, in forming the 

 railway from near Keymer, through Lewes, to Newhaven, I obtained a 

 fine series of all these genera. Figures of Turrilites, Scaphites, &c, 

 are given in Medals of Creation, vol. ii. pp. 502, 504. 



f See Medals of Creation, vol. ii. p. 462. Belemnitella is the gene- 

 ric name of the belemnites having a fissure down the front of the 

 alveolus, or cavity which receives the phragmocone. 



