31 



2. Alderi. 



Shell with the spire produced, acute, of five whorls, 

 divided by a shallow suture ; the lower whorl largest 

 and rounded ; the upper ones nearly flat. Smooth, 

 purplish-brown, with two bands of plain yellow, 

 which are each bordered by two narrow bands of 

 white, spotted with brown. Lower part of the first 

 whorl white ; a dark brown band bounds and enters 

 the umbilicus, which is neither grooved nor striated. 

 Pillar lip brown and white, slightly reflected on the 

 umbilicus. Inside brownish white. Operculum 

 corneous. 



Young shell with the spire less produced, and the 

 markings paler. 



Animal with a produced globular pink head (an 

 proboscis ?) having the mouth, which is longitudinal 

 and pear-shaped, in front, below which is a little foot- 

 like process ; jaws cartilaginous, square, toothed in 

 front like a saw ; tongue like that of a Littorina, but 

 shorter and broader in proportion ; mantle pinkish 

 white ; between the mantle and head is a sort of veil, 

 which is furnished with two distant triangular ten- 

 tacula, one of which is colourless, and the other pink, 

 dark brown at the tip, but with no trace of an eye ; 

 foot pinkish-white, its sides variegated brown. 



This is the most beautiful British species of a 

 beautiful genus, and appears to be as generally distri- 

 buted on our shores as the last, with which it has 

 hitherto been confounded. Indeed, I had for some 

 time (though not without doubts) regarded it as the 

 young of the last, until my attention was directed to 



