BUCCINID^. 153 



Distr. — 20 sp. All tropical and subtropical seas. P. senti- 

 cosus^ Linn. (1, 42, 43). 



Shell cancellated, oblong, acuminated, usuall}'' longitudinally 

 ribbed ; outer lip striated internally, with a slight sinus near the 

 fore-part ; columella obliquely grooved, or with a single plait in 

 front. Operculum claw-shaped, nucleus apical. 



The animal of Phos has a small head, with the tentacles 

 approximating or connate at their base, and eyes near their tips ; 

 foot dilated, forming an auriculate, shield-like lobe in front, and 

 terminating behind in a long, tapering filament. 



The species of Phos bear some resemblance to Nassa, and 

 were originall}^ placed in the family IS^assidffi ; from which, how- 

 ever, they are distinguished by certain good conchological and 

 malacological characters. The turreted form, cancellated sur- 

 face and grooved interior of aperture are common to Nassa also, 

 but the oblique basal fold of the columella is characteristic of 

 this genus. The animal differs from Buccinum in the foot, 

 ending in a filament behind : Nassa has a bifid posterior termina- 

 tion. 



Nassaria (Link), H. and A. Adams. 



Syn. — Hindsia, Ads. 



Distr. — 10 sp. Lidian 0., China, Japan, Philippines. N. 

 acuminata^ Rve. (1, 44). 



Shell ovately fusiform; spire acuminated, whorls longitudi- 

 nally ribbed and cancellated; aperture ending •anteriorly in a 

 long recurved canal ; inner lip thin, circumscribed, transversely 

 corrugately plicated ; outer lip grooved internally. Operculum 

 ovate, nucleus apical. 



Animal with the tentacles connate at the base, with the eyes 

 near their distal ends ; foot anteriorly produced, ending behind 

 in a simple tail without filament. 



This genus partakes of the characters of several recognized 

 forms. Its animal, however, differs from that of Triton in the 

 approximated tentacles, with the e^^es near their ends, and the 

 anteriorly produced foot ; from that of Nassa in the tail not 

 being bifurcated. In its shell it may be known from Phos by its 

 recurved canal ; from Nassa by its circumscribed inner lip and 

 elongated canal ; and from Triton by its want of irregular varices. 



Cyllene, Gray. 



Distr. — 10 sp. Indian 0., China, Philippines, W. Africa. C. 

 lyrata^ Lam. (1, 45, 46). 



Shell ovate ; spire short, acute, suture canaliculated ; columella 

 concave, smooth or finely grooved ; outer lip with a slight sinus 

 at the fore-part, emarginate posteriorly, grooved internally. 

 Operculum with terminal nucleus. Dentition unknown. 



The species of Cyllene inhabit the intertropical coasts of Africa, 



11 



