284. 



Antediluvian Zoology and Botany. 



shells, but their forms are too singular to be passed without 

 separate notice. The structure of these animals has been 

 subjected to the examination of Messrs. Parkinson, T. Allan, 

 and Miller, and, lastly, of M. de Blainville, in his memoir on 

 Cephalopodous Mollusca. 



Illustrations of Mr. Miller's article on Belemnites, in the Transactions of 

 the Geological Sodety^ New Series, vol. ii. pi. 7, 8, and 9. 



Section of a Belemnite, showing 

 the chambers filled with spar. 

 Section showing the siphunculus 

 within the conic-chambered shell. 

 Belemnites elongatus, of the lias, 

 exhibiting the chambered cone 

 partly enclosed by the laminated 

 guard ; its inhabitant being a iSepia. 

 Belemnites minimus, of the gault. 

 Mr. Miller's new genus Actino- 

 camax, without a chambered cone. 



These bodies are determined to be concamerated shells, 

 intermediate between the bony 5epia and the shelly A^autilus. 

 They are found in almost all the formations from the lias to 

 the chalk, but not in the slate formation, or in mountain lime- 

 stone ; neither have they been found in the beds above the 

 chalk. In the first case (the slate and mountain limestone), 

 M. de Blainville conceives their places were supplied by the 



