184 DESCRIPTION OF SHELLS. 
Pleurotoma obscurata. (Tab. VII. fig. 19.) 
Spec. Cuar.—Turrited, elongated, transversely striated, ribbed, or waved ; 
whorls few, compressed above, with a row of granules around the edge ; ribs 
rather prominent on the middle of the whorl ; beak short, narrow, spreading 
into the oval aperture. 
Length three times the width ; the aperture and beak together equal the width 
of the shell. 
The form of the beak affords a means of distinguishing this from the last. 
Pleurotoma plebeia. (Tab. VI. fig. 23.) 
Spec. Cuar.—Turrited, subcylindrical, obtuse, transversely striated ; whorls 
concave above, with a row of bead-like tubercles along the middle; striz 
decussated by lines of growth; aperture obovate, with a canal above; beak 
elongated, narrow, straight, shorter than the width of the shell. 
Length three times the width. 
Resembling Pleuwrotoma comma, but longer and blunter, and furnished with a 
narrower and longer beak and more striz ; a very common species. 
Fasciolaria biplicata. (Tab. V. fig. 7.) 
Spec. Cuar.—Fusiform with a short beak, acute, undato-costated, transversely 
striated ; whorls convex, ten to twelve, with a compressed striated margin ; 
cost six or seven, broad, prominent in the middle of the whorl ; aperture ovate, 
elongated ; columella nearly straight, furnished with two plaits near the middle. 
Width 2, length 5; aperture and canal longer than the width. 
A remarkable, but by no means rare shell at Bracklesham Bay. Intermediate 
between Fusciolaria and Fusus, two nearly allied genera distinguished by the plaits 
on the columella of the former. Its nearest ally is Fusus incertus of Deshayes, 
which has a much longer beak. 
Fusus Pyrus and Fusus Bulbus. 
We have kept these two names separate, although we can hardly be per- 
suaded that the shells indicated by them are not one species. 
