370 INVEBTEBKATA CHAP. 



If, and when, the development of Nautilus is worked out, we 

 shall probably gain points for comparison of the development of 

 Cephalopoda with that of other Mollusca ; in the meantime we can 

 only conclude that the accession of large stores of nourishment has 

 almost obliterated the traces of ancestral history in their development, 

 leaving only the most general resemblance in the formation of the 

 layers and the development of the sense-organs, as links between 

 them and other Mollusca. In fact, the reflection of the development 

 of organs which become important in adult life, into successively 

 earlier periods of development, termed by Lankester heterochrony, 

 has, in Cephalopoda, reached its maximum. 



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