CB ITNIVALVKS ARGONAUT A 



HI. 



{ainljalD^0. 



SHELLS OF ONE PART ONLY, AND HAVING A REGULAR 

 SPIRE. 



ARGONAUTA.— Paper Sailor. 



Animal— a Sepia or Clio: Shell univalve^ sjnral, invO' 

 lute, membranaceous, one-celled. 



TEIE genns Argoiiauta contains but five species; and, in 

 so small a number, much variety is not to be expected. 



The form throughout is generally like that of a scroll, 

 -with a very large aperture, and mostly a double carinated 

 outer margin. However, in the Argonauta vitreus (the 

 glassy nautihis) the margin is but single: this rare and 

 beautiful species is by far the most costly of any.* 



The shells of this genus are remarkable for their exces- 



• There are only three shells of this species known; one in the 

 possession of the Earl of Mountnorris, another in the Public Col- 

 lection at Parib, and a third in the private collection of a French 

 ^otlenian. 



