114 NASSIN^E. 



Sub-gen. LEiODOMUS, Swainson. 



Shell turreted ; whorls convex, transversely striated. 



Taheitensis, Gray. velatus, Gould. 



Tranquebaricus, Bolt. vittatus, Linn. 



turritus, Gray. 



Sub-ffen. adinus, II. and A. Adams. 



Shell subulate, spirally striated ; columella abruptly truncate 

 at base ; inner lip corrugated, with a callosity at hind part ; outer 

 lip grooved internally, externally marginated. 



truncatus, Reeve. ictericus, Soland. 



Genus PHOS, Montfort. 



Tentacles connate at the base, eyes near their tips. 

 Foot with an auriculate shield-like lobe in front, and ending 

 behind in a single tapering filament. 



Shell cancellated, oblong, acuminated, usually longitudi- 

 nally ribbed ; outer lip striated internally, with a slight 

 sinus near the fore part ; columella obliquely grooved, or 

 with a single plait in front. 



Syn. Rhinodomus, Sioains. 



Ex. P. textum, Gmelin, pi. 12, fig. 5. Operculum, P. 

 Ipevigatus, A. Adams, fig. 5, a, 5, h. Shell, P. sentieosus, 

 Linnaus, fig. 5, c. 



The great peculiarity of Phos is the circumstance of the 

 hind part of the foot ending in a tapering filament instead 

 of being simple as in Buccimwi, or bifid as in Nassa. The 

 columella, anteriorly, has a single fold, and there is a notch 

 at the fore part of the outer lip ; the canal is never elongate 

 or recurved as in Nassaria. 



