ARGONAUTA. 



Plate III. 



Species 6. (Fig. 2 b, Mus. Cuming.) 



Argonauta Gruneri. Arg. testa transversissime invo- 

 luld, conspicue granulatd, lateribus subventricosis, rugis 

 tumidiusculis, cito evanidis; carina lata, medio regula- 

 riter nodosa, marginibus vix tuberculatis ; auriculis 

 contract is. 



Gruner's Argonaut. Shell very transversely invo- 

 lute, conspicuously grauuled, sides rather ventricose, 

 wrinkles somewhat swollen and soon fading; keel 

 broad, regularly nodose in the middle, edges scarcely 

 tubercled ; auricles contracted. 



Duxkek, Nov. Conch. Second Series, p. 29. pi. 9. f. 1,2. 



Hab. Marquesas. 



I had numbered the figure of this species 2 b, to indi- 

 cate a variety of Argonauta Argo, but I iucline to think, 

 upon a more careful examination of several specimens in 

 the collection of Mr. Cuming, that it is distinct. There 

 is one very important difference between this and all the 



varieties of A Argo. Instead of the keel being narrow 

 and smooth on the area between the tubercles, it is broad, 

 convexly swollen, and covered throughout with moderately 

 developed wart-like nodules. 



Species 2. (Fig. 2 c, Mus. Cuming.) 



Argonauta Argo. A transversely involute form of the 

 species, of which Mr. Cuming has three specimens from 

 Venezuela. The shell has nothing to distinguish it from 

 the Mediterranean form, of which specimens may be found 

 involuted in an equally trausverse manner. 



Species 2. (Fig. 2 (/, Mus. Cuming.) 



Argonauto Argo. A more rounded form of the species, 

 of which specimens have been received by Mr. Cuming, 

 from Mr. W. H. Pease, of the Sandwich Islands, collected 

 by him at Tahiti. 



April, 1861. 



