GASTEROPODA. 245 
The animal is extremely sluggish and timid. It in all respects re- 
sembles the animal of Purpura, except that the foot is bilobate in 
front, and somewhat attenuated posteriorly. [J. p.c.] 
Found at Honden Island, Paumotu Group. 
Figure 309, the animal, with the shell, viewed from beneath ; 309 a, 
operculum. 
PURPURA ARMIGERA (Lamarck), Anim. sans Vert., x. 73. REEVE; 
Conch. Icon., pl. 6, f. 27. 
A variety of this shell with three or four rows of large conical or 
pyramidal protuberances, was found on the reefs at Raraka, Honden, 
King’s and Carlshoff Islands, Paumotu Group. 
ANIMAL with the body umber-coloured, paler towards the neck and 
veined with dark lines, so as to give it a tessellated appearance. 
Siphon large and long, ash-coloured above, paler beneath; tentacles 
variegated pale-brown and cinereous as far as the eyes, which are near 
the extremities, above which is a band of umber, and colourless tip. 
Foot distinctly auriculate, pale ochreous, the surface reticulated with 
white veins, and finely incised at the margin; mantle pale ochreous, 
mottled with cinereous and margined black, with indentations corre- 
sponding to those of the lip of the shell. Operculum chestnut-brown, 
darker at centre, elements loosely attached. 
Movements of the animal very active, the two halves of the foot 
advancing alternately. 
PURPURA SCOBINA (Quoy and Gatm.), Voy. de l’Astrol., pl. 38, f. 12, 
13. Krener; Iconog., pl. 35, f. 83. DesHayes; ed. Anim. sans Vert., 
x. 113. 
SHELL instead of being girded with one or two nodulous carine, 
with the laminz in the intervals, as if raised up by the oblique prick 
of a pin, thus making a rasp-like surface, is sometimes found divested 
62 
