, 62 
ROSTELLARIA. 
GENERIC CHA RACTER : Tlie shell spindle shaped or 
subturreted, ending in a beak shaped canal ; right, lip entire 
or toothed, more or less dilated with age; a sinus near tb e 
canal. 
* R. PES PELECANI. Strombus P. P. Turt. Lin. Pen- 
Brit. Zo., vol. 4, pi. 75. Stew. Elem., vol. 2, p. 403- 
Mont. Test, Brit., 1, p. 253, R. P. P. Flem. Brit. An- 
p. 359. Not uncommon. No animal seems to be better 
protected from harm, than this; and yet I have obtains 1 
it, of full growth, from the stomach of a species of sta r ' 
fish (Asterias Papposa) of no large size. When the sO> 
portion has been digested, the empty shell is rejected, and 
thus becomes the habitation of the Sipunculus Strombus I 
which formes a nest for itself by narrowing the entrant 
with agglutinated sand. 
PURPURIFERA. 
The shell with a short canal ascending posteriorly, or !1 ° 
oblique notch or half canal at the bottom of the aperture ’ 
directed towards the back. Columella flattened, pointed 3 
the base. 
PURPURA. 
GENERIC CHARACTER: Shell oval, smooth, tuber' 
cnlar or angular; aperture dilated, the lower part term 1 ' 
nating in an oblique subcaniculated notch. Columefl 3 
flattened, pointed at the base. 
* P. LAPILLUS. Buccinutn L. Turt. Lin. Pen. Bri t ’ 
Zo., vol. 4, pi. 72, fig. 89. Borlase’s Nat. Hist, of Corn-> 
pi. 28, Mont. Test. Brit., vol. 1, p. 239. Stew. Elen’'' 
vol. 2, p. 401. P. L. Flem. Brit. An., p. 341. 
Montagu has rightly observed that this common shell P 
subject to much variety ; but it may still be questiooe 
whether two species have not been confounded together' 
The most, common is that given in the references as abo'^’ 
and of which Pennant has engraved a figure, on the left s ,c j 
of his plate, below fig. 88. It varies in having the cham 1 ^ 
more or less extended; in the outer lip, which is someth’ 1 . 
strongly tuberculated within; and even sometimes s 
tubercles on tbe columella ; whereas in other instances it 
but slightly waved, as represented in Pennant’s other fig u,e "' 
The general colour is a faint greenish yellow ; but some 111 __ 
white, or very dark ; or again, with a single or double 
circling yellow or black bands. Young specimens are mark ^ 
with circular concave thin ridges; which in the course ^ 
time are rubbed off' by the friction which the shell receP 
from the violence of the waves. The other variety or sp eC,e ’ 
has the lower whorl much more globose, the chief expanst 
