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PLEUROTOMA. 
Murex, Linné. 
CHARACTER GENERICUS. 
Testa fusiformis; os inferné canali elongata terminatum ; 
labium exterius tenue, fissura profunda emarginatum. 
ANIMAL tentaculis duobus acuminatis, ad basin externé 
oculigeris ; operculum corneum ; pes elongatus. 
PLEUROTOMA. 
Shell fusiform’; mouth terminated below by an elongate 
canal ; external lip thin, with a deeply-cut fissure. 
ANIMAL with two acuminate tentacula, bearing the eyes at 
their base externally ; operculum corneous ; foot elon- 
gate. Men 
The Pleurotomata are marine, and there are many spe- 
cies, some of which occur in a fossil state. 
