MALACOZOA. GASTEROPODA. FECTINIBRANCHIATA. 1J1 



rower, besides wanting the sinus characteristic of the genus 

 Pleurotoma. I have compared it with Fusus linearis of Mon- 

 tagu, but find it different in many respects. 



GENUS 3. PLEUROTOMA. 



Shell ovato-fusiform ; the spire pointed ; the aperture 

 oval or oblong, with a more or less prolonged and slightly 

 recurved canal at its anterior part, the outer lip with a 

 distinct notch, slit, or sinus at its upper angle, the 

 columella smooth. 



1. Pleurotoma Banffium. Banff Pleurotoma. 



Shell oblongo-fusiform, rather thick ; with the spire tapering 

 to a fine point; the whorls rounded, with numerous rather 

 irregular, thin-edged, laminar, transverse ribs bent toward the 

 mouth of the shell, and marked with rather obsolete transverse 

 and spiral striae ; the suture distinct ; the last whorl about the 

 same breadth as the length of the spire ; the mouth oval, with 

 a moderately wide canal deflected to the left and somewhat 

 recurved ; the colour of the exterior dull white or yellowish- 

 white, of the mouth white. Length eight- twelfths, breadth 

 three-twelfths and a-half. 



From deep water off Aberdeen ; apparently rare. Found t 

 also by me, on the 5th of August, 1842, in a fishing-boat at 

 Boddam, or Buchan-Ness. A live individual found at Aber- 

 deen, by Miss Macgillivray, in September, 1812. 



Murex Bamffius. Penn. Brit. Zool. iv. 284. PI. 82. f. 5. Murex 

 Bamfius. Mont. Test. Brit. Suppl. 1 17. Fusus Bamfius. Flem. 

 Brit. Anim. 351. 



2. Pleurotoma Turrlcula. Turret Pleurotoma. 



Shell oblongo-fusiform, thin ; with the spire tapering to a 

 fine point ; the whorls angulate at their upper part, giving the 

 spire a remarkable scalar appearance; the last whorl of less 

 breadth than the length of the spire ; the suture distinct ; the 

 whorls with transverse narrow, convex ribs, which are nodose 

 on the angle, and slender longitudinal, unequal ridges, giving 

 the surface a cancellated aspect ; the mouth narrow, oblong, 

 with the outer lip thin, more or less sinuate at the angle ; the 

 canal rather short ; the colour of the exterior white or yellow- 

 ish, of the mouth white. Length eight-twelfths of an inch, 

 breadth nearly three-twelfths. 



