BUCCINUM. 191 



i\^. reticulata: animal yellowish, speckled with grey, its foot 

 terminating in two filaments, which are turned up ver- 

 tically in walking. Shell brownish, with dark bands ; 

 lips white ; longitudinal ribs flexuous, with knobs near 

 the suture. 

 N. incrassata: with the end of the foot divided into very 

 short, triangular processes. The shell is shorter, and 

 the whorls more rounded, and the colouring brighter, 

 than in N. reticulata. 

 N.pygmcea: the caudal processes of the foot are long and 

 filiform, as in N. reticulata. The shell has a long 

 spire and short mouth ; it is closely ribbed, and ex- 

 hibits here and there an irregular varix. 

 y. BucciNUM, or Whelh. — The shell of the common 

 British species of our markets is subject to so great a varia- 

 tion of shape, sculpture, and even colouring, that it would 

 not be easy to describe the species from any one variety, 

 but the prevailing form is oval, with a large body-whorl 

 and aperture, and a spire with moderately rounded whorls. 

 The elegant curvature of the wave-like swellings on the 

 whorls gives our species the appropriate name of B. tmda- 

 tum: across these undulated swellings run, in a spiral direc- 

 tion, raised lines. The shell is sometimes small and of great 



