"Cephalopode" Quotes from Famous Books
 ... (Aptychus of some authors)(Figure 319) is also widely dispersed through this clay. The real nature of the shell, of which there are many species in oolitic rocks, is still a matter of conjecture. Some are of opinion that the two plates have been the gizzard of a cephalopod; others, that it may have formed a bivalve operculum ...
— The Student's Elements of Geology • Sir Charles Lyell |
