MALACOZOA. GASTEROPODA. PECTINIBRANCHIATA. 167 



oanded. In young shells the ribs and undulated lamellar striae 

 are generally well denned, but in old shells obsolete. 

 Abundant on all the rocky coasts. 



Buccinum minus albidum, asperum. Lister, Anim. Angl. 158. 

 PL 3. f. 5, 6. Buccinum Lapillus. Linn. Syst. Nat. i. 1202. 

 Buccinum Lapillus. Penn. Brit. Zool. iv. 118. PL 72. f. 89. Pur- 

 pura Lapillus. Lamk. Syst. vii. 244. Purpura Lapillus. Flem. 

 Brit. Anim. 341. Buccinum Lapillus. Mont. Test. Brit. 239. 



FAMILY II. -FusiNA. 



Animal with the body elongated, spiral, and covered 

 with a shell ; the head with two somewhat conical de- 

 pressed tentacula, which bear the eyes on a prominence 

 at their base externally ; the mouth furnished with a 

 long cylindrical annulated proboscis, and a filiform 

 tongue ; the mantle forming a thin-edged flap over the 

 branchial cavity, and on the left side an elongated open 

 canal, which emerges by a groove in the shell ; branchiae 

 two, unequal, pectinate; foot very large, generally broad; 

 a horny operculum. 



Shell various, more or less fusiform, spiral ; its aper- 

 ture with a prolonged canal for the respiratory tube at 

 its anterior part. 



The species are marine, and zoophagus. There is 

 perhaps no real zoological distinction between the Buc- 

 cinina and Fusina ; but the latter may always be known 

 by their elongated canal, which in some of the species is 

 even as long as the spire. 



GENUS 1. MUREX. ROCK-SHELL. 



Animal elongated ; the body spiral : with two taper- 

 ing depressed tentacula, much dilated at the base, and 

 having the eyes, which are small, situated near their 

 base externally ; the proboscis long, exsertile, cylindri- 

 cal ; the foot large, oval, rugose ; the operculum ovate, 

 concentrically striate, horny, 



Shell generally oval, with the spire pointed ; the 

 turns traversed by three or more prominent varices or 

 ribs ; the aperture rather small, ovate, or oblong, pro- 



