OF CREATION. 



95 



of doubtful affinity, which has been referred in suc- 

 cession to various groups of Mollusca, and even to 



Fig. 36 Fig. 38 Fig. 37 



Fig. 39 



BELLEROPHOX. MURCHISONIA. BELLEROPHON. 

 the Pteropoda, known to occur in the silurian rocks. 

 The great thickness of the shell, its structure and 

 mode of growth, and the kind of shells associ- 

 ated with it, render it more likely, perhaps, that the 

 animal belonged to the 

 Gasteropoda, and was not 

 far removed from the 

 limpet.* 



The Cirrus^ a flat 

 shell, composed of a num- 

 ber of whorls, and often 

 attaining an enormous EUOMPHALUS. 



size, seems to have inhabited the same muddy bot- 

 toms near shore ; and the EuompJialus j (fig. 39) pro- 

 bably resembled it in habit. 



* De Koninck, Animaux Fossiles de la Belgique, p. 334. 

 t Cirrus, a curl ; so called from the form of the shell. 

 | Euompkalus, iv (eu), elegant ; ofKftaXoQ (omplialus), a boss : so called 

 from the well-marked and distinct proportions of the shell. 



