ARGONAUTA.— "Plate 1. 



tubercles prominent and rather distant ; auricles >\n\- 



traoted, sometimes callously prolonged. 

 l.wi MiiK, Auini. sans vert. vol. xi. p. 357. 

 iHtutia Irgo {part), Linnnus. 



Argonavta nodosa, Solander, MS. 



Argonauta tuberculata, Shaw. 

 Ilii/i. Moluccas, Tasmania, Brazil. 



Tin- characters of tins species arc well-defined, and ex- 

 hibit little or no variation. Whether from the Moluccas, 



Tasmania, or Brazil, from each of which localities Mr. Cu- 

 ming possesses specimens, — and it may havo a still wider 

 range of habitation, — the shell is of the same elegant orbi- 

 cularly involuted form, with the sides ventricoscly convex, 

 contracted about the auricles, of which the callous margin 

 is sometimes sinuously prolonged. The fine specimen fi- 

 gured in our Plate, in an uncleancd state, enveloped with 

 a (ilmy yellowish tissue of animal matter, is from Tas- 

 mania. 



