EXPLAISTATION OF THE PLATES. 



The principal specimens figured were kindly communicated by Mrs. J. 

 E. Gray, Mr. Hugh Cuming, Major W. E. Baker, Mr. Laidlay of Cal- 

 cutta, Mt. Pickering, Sir Charles Lyell, Mr. S^^lvaniis Hanley, Prof, 

 James Tennant, and Mr. Lovell Reeve. 



The fractions show the number of times (or diameters) the figures 

 are reduced, or magnified. 



PLATE I. 



Octoioodiclce. 



Page 



1. Octopus tubercid-atus, Bl. \. Mediterranean , . . . 163 



2. • {_mancUhles) loG 



3. Tremoctopus A-iolaceus, <?. Chiaje. Messina 159, 164 



TeutJiidce. 



4. Sepiola Atlantica, Orb. Atlantic 169 



6. Loligo "VTilgaris, Lam. {gladius). \. Britain 167 



7. Onychoteuthis Bartlingii, Le Sueur. \. Indian Ocean 171 



8. {gladiiis). i 171 



Sejnctdce. 



5. Sepia officinalis, L. l . Britain 177 



Sjnrididce. 



9. Spirula kcvis, Gray. ^-. Xew Zealand 178 



