116 NASSINiE. 



with a velvety epidermis, and some of the species are 

 ornamented with red and brown markings. 



'fe- 



Species of Desmoulea. 



abbreviata, Chem. pinguis, A. Adams. 



crassa, A. Adams. pulchra, Gray. 



Japonica, A. Adams. pyramidalis, A. Adams. 



obtusa, Chem, ventricosa, Lam. 



Genus NASSA, Martini. 



Eyes on the middle of the tentacles ; lingual teeth 

 arched, pectinated ; uncini with a basal tooth. Foot large, 

 expanded, bifurcate at its posterior extremity. 



Operculum ovate, the margin serrated or entire. 



Shell ovate, ventricose, body- whorl variously sculptured; 

 aperture ovate, with a short reflected truncated anterior 

 canal ; inner lip smooth, often widely spread over with 

 enamel, with a posterior callosity or blunt dentiform plait ; 

 outer lip dentated, internally crenulated. 



Ex. N. leevis, Chemnitz, pi. 12, fig. 7. Operculum, N. 

 dispar, A.Adams, fig. 7, a, 7, h. Shell, N. Isevis, fig. 7, c. 



The NasstB, remarkable for their bifid foot, are extremely 

 active and vivacious in their movements, feeding on bivalves, 

 which they pierce with their proboscis, extracting the con- 

 tents through a small round aperture. 



Species of Nassa. 



arcularia, Linn. delicata, A. Adams. 



Bronnii, Phil. dispar, A. Adams. 



coronata, Brug. fissilabris, A. Adams. 



coronula, A. Adams. rnutabilis, Linn. 



