334 CONRAD'S SYNOPSIS OF THE GENERA PARAPHOLOS AND PENICILLA. 



13. A. CRASSicosTA, Blainville. Diet, des Sci. Nat., Ixiii. p. 213. 

 Inhabits the Australian Seas. 



This species I have not seen, but from the description it must be related to A. gon- 

 dola, if not the young of that species. 



14. A. NAViFORMis. Patulous; ribs large, acute; spine prominent, reeurved ; sinusof the lip widely curved. 

 A. argo, var. Poli. Test. Sicil, iii. t. xl. fig. 2, 3. 



In addition to these Dr. Gould has described tlie animal of an Argonauta, {A. 

 geniculata,) in the Moll, of the U. S. Expl. Expedition. 



