162 MALACOZOA, GASTEROPODA. PECTINIBRANCHIATA. 



SECTION II. — SI PH ON AT A. 



Branchial aperture with a tube formed hy the edge of the 

 mantle, and occupying a canal or notch in the shell. 



FaMIL-X I. BUCCININA. 



Animal with the body elongated, spiral, and covered 

 with a shell ; the head with two conical depressed ten- 

 tacula, which bear the eyes on a lobe or prominence at 

 their base externally ; the mouth furnished with a Lmg 

 cylindrical annulated proboscis, and a small tongue ; the 

 mantle forming a thin-edged flap over the branchial 

 ca\'ity, and on the left side an elongated open canal, 

 which emerges by a notch or groove in the shell ; bran- 

 chise two, elongated, unequal, pectinate ; foot large, 

 generally broad ; a horny operculum. 



Shell various, generally elongated, spiral ; its aperture 

 with a notch or very short canal at its anterior part. 



Most of the species are marine, and feed on animal 

 substances. 



Genus I . Buccinum. Buccine or Whelk. 



Animal elongated ; the body spiral ; with two tapering 

 depressed tentacula, on a lobe at the base of each of which 

 externally is a very small eye ; the proboscis long, cylin- 

 drical ; the foot large, subelliptical ; the operculum ovate, 

 concentrically striate, thin, horny. 



Shell ovate, elongated ; the spire moderate, pointed ; 

 the aperture oval or oblong, with a deep notch anteriorly ; 

 the columella plain or callous ; the outer lip plain. 



Most of the species are marine. The proboscis being 

 armed with minute teeth, and the tongue beset with 

 prominences like a rasp, they have the power of perforat- 

 ing shells of mollusca and Crustacea, their food consisting 

 of animal substances. 



1. Biiccinum nnddtum. Waved Buccine. 



Shell ovato-conical, thick ; with the spire tapering to a fine 

 point, the turns convex, longitudinally striate and sulcate, 

 obliquely undulated with convex curved ribs, and transversely 



