604 MOLLUSCA SUB-KINGDOM V1 
structure is reduced to the merest rudiment. Jurassic Chondrophoridae approximate 
closely to recent members of the same family. All the evidence at our disposal 
justifies the conclusion that Mesozoic Cuttle-fishes possessed an essentially similar 
organisation to that of recent forms. 
[The rendering into English of the original text for the chapters on Mollusca, exclusive 
only of the Dibranchiates (Grundziige, pp. 250-435), was performed by Dr. John C. Merriam, 
Professor of Palaeontology in the University of California. His careful translation greatly 
facilitated the labours of Professors Dall, Pilsbry, and Hyatt in their revision of the several 
groups accredited to them.—TRANS. ] 

Fic. 1260. 
Restoration of Meganeura Monyi Brongt. Carboniferous; Commentry. 1/g natural size (after Charles 
Brongniart). See page 684, 
