62 MALACOZOA. GASTEROPODA. PECTINIBRANCHIATA. 



notch anteriorly, tlie columella callous, the outer lip 

 toothed. 



1. Ndssa incrassdta. — Shell ovato-conical, thick, with 

 the turns convex, longitudinally grooved, transversely 

 ribbed, nodulose ; the notch with a black spot. Incras- 

 satus, thickened. 



Genus 3. Purpura. — Shell ovate, thick, with the 

 spire short, the aperture elliptical or semioval, the outer 

 lip thin-edged, the columella flattened, the canal short. 

 Pkrjmra, purple, some animals of this and allied genera 

 yielding a purple dye. 



1. Purjnu^a LcqnUus. — Shell ovato-fusiform, thick, 

 with the turns convex, longitudinally ribbed, transversely 

 lamelloso-striate ; aperture elliptical, the outer lip in- 

 ternally grooved or toothed. Lajyillus^ a small shell. 



Family VII. — Fusina. 



Body elongated, spiral ; head with two conical, some- 

 what depressed tentacula, eyes on basal external pro- 

 minences ; mouth with a long cylindrical annulated 

 proboscis ; mantle with a long open canal ; foot rather 

 large. Shell more or less 'fusifonn, spirate, with a long 

 canal at the anterior part of the aperture, and a horny 

 operculum. Name from the genus Fusus. 



Genus 1 . Murex. — Shell fusiform, oval or oblong ; with 

 rows of ridges, tubercles, or spines, generally in regular 

 order, aperture oval, terminated anteriorly by an elon- 

 gated closed canal. Murex, the ancient name of a 

 shell. Linnoens. 



1 . Murex Einnuceus. — Shell ovate, with seven or eight 

 turns, w^hich are transversely costate and longitudinally 

 sulcate ; the aperture ovate, with the outer lip thick, 

 internally dentate; the canal loug and closed. Erind- 

 ceus, a Hedgehog. 



Genus 2. Fusus. — Shell fusiform, with the spire point- 

 ed, the aperture oval or oblong, with an elongated, 

 slightly recurved canal. Fusus, a spindle. 



1. FiUus antiquus. — Shell ovato-fusiform, with the 



