430 
THE OCEAN WORLD. 
oblong, the spire more or less elevated, its surface generally covered 
with rows of spines, or tubercular ramifications. The opening, whirl* 
Fig, 274. llarpft imperially (Lamarck), 
Fig. 275. Ilarpa articu laris 
(Lamarck). 
is oval, is prolonged in a straight canal often of very considerate 
length, as in Fig. 277 ( Murex haustellum) ; the external edge lS 
often smooth or rippfo®’ 
the * columellar e &8 e 
sometimes callous. 
The head of 
animal is furnished wh 1 
two horns or tentad eS ’ 
ocular upon their ex- 
ternal side, the mod 
elongated in the form ® 
a trunk. The foot * 
large and round, a ° 
furnished with a hoi 11 / 
operculum. 
Among the sp e ' 
with long slender 
tuhe» 
covered with spineS; 
of the most notahfo 
oU e 
is 
Fig. 276. Murex tenuispina (Lamarck). Fig. 257. Mnrex hanstel- MureX tenuispi'^ (•* 
lum (Linnaus). 
276), which is a n a « v 
of the Indian Ocean and the Moluccas. 
