b 



Antediluvian Zoology and Botany. 285 



Orthoceratites ; and, in the second, by the Belopterae. Their 

 geological situation, on this authority, is as follows : — 



- 1 species. 



- 8 



- 11 



50 



" I have not dared," this author remarks, " to state that 

 the secondary formations are each characterised by a division, 

 or even by a particular species, of Belemnites, but that is pro- 

 bable." The examination of these species has led to the fol- 

 lowing results : — That the larger their cavities are, the nearer 

 they approach to the true Orthocerae ; and the more they 

 are adherent to the rock which contains them, the more 

 ancient are they. As they recede in antiquity their struc- 

 ture becomes more crystalline; but, as they approach the 

 recent strata, this structure, on the contrary, becomes more 

 fibrous. (Jig, 74.) 



The author proceeds to notice some other genera of fossil 

 bodies which possess characters and properties allied to 

 Belemnites and Sepias. The entire gradation of this class, 

 ascending to the A^autili, may be thus briefly stated : — 



Genera. Sp. Description. 



^doubtfurTnul) ] ^ Without a cavity. A. verus, of the chalk. 

 Belemnites - 49 With a multilocular shell. See Min. Conch. 



C With a multilocular shell. Between the Belemnites 



T> 1 r „ 3 ^^^ ^h® Sepia, but approaching nearest to the lat- 



P " J ter : analogous to the posterior part of the bone 



C of the Shpia. . 



p , r, , n i With a multilocular shell, but without a cavity. 



m i Found in chlorite chalk and lower oolite. 



Rhyncolithes - sev. \ ^'^\^^^^ ^ ^^vi^y- ^^ belonging to ancient forma- 



C Approaching to iS'epia, but resembling the beak of 

 Conchorhynchus - < a bivalve shell : perhaps a genus nearest to Te- 



([ rebratulae, 



r In the limestone of Pappenheim^ absolutely re- 



c^ • . J sembling those with which we are acquainted 



^ " ' y at the present day ; also in the lias of Twiver- 



(. ton and Keynsham, near Bristol. 

 Orthoceratites, Nautilites, &c. 



ARTICULATED ANIMALS. 



Crustacea. — Crabs and lobsters, in a mineralised state, 

 have been obtained, sparingly, from several of the formations : 

 commencing with the lias, abundant in the London clay, and 

 almost unaltered in the crag. 



V 3 



