148 



SPECIFIC 



Shell transversely striate, wrinkled towards the 

 base. 



Gualt. test. tab. 79. A. 



Specimen horn-colour with darker clouds ; about 

 10 obsolete ribs converging to the smaller end ; 

 triangular ; hyaline; brittle. A smooth variety. 



Inhabits India and Europe, 



PLATE XII. 



Fig. 1. Argonauta Argo, 



Shell having the keel slightly toothed on both 

 sides. 



Lister Conch, tab. 254, 255. 



Specimen white, with undulated, smooth, and 

 bifurcated ribs ; teeth of the keel brown towards 

 the apex, extremely thin and brittle. 



Inhabits the Mediterranean and Indian Ocean. 



Fig. 2. Nautilus Pompilius. 

 Shell with a cordate aperture, whorls obtuse and 

 smooth. 



Lister Conch, tab. 550. fig. 1.3. 



Specimen white, with flexuous yellowish tawny 



