BUCCINIDA. 153 
Distr.—20 sp. All tropical and subtropical seas. P. senti- 
cosus, Linn. (1, 42, 43). 
Shell cancellated, oblong, acuminated, usually 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 originally placed in the family Nassidz ; 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 ina filament behind: Nassa has a bifid posterior termina- 
tion. 
NassariaA (Link), H. and A. Adams. 
Syn.—Hindsia, Ads. 
Distr.—10 sp. Indian O., China, Japan, Philippines. WN. 
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 eyes 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 O., 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, 
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