TROCHUS. 501 



broader than the rest, and occasionally is spirally sub- 

 divided. Here and there a scarcely-raised very fine inter- 

 mediate stria shows itself in the interstices, which are 

 always rather broader, or at least as broad, as the belts. 

 The granules upon the smaller whorls are more rounded 

 than those upon the larger volutions, the belts of which 

 latter have frequently somewhat the look of twisted ropes. 

 The apical whorls are cancellated. The usual number of 

 belts upon the upper part of the body is eight or nine, 

 besides the obtuse carina ; the entire surface of the shell is 

 more or less distinctly marked with delicate longitudinal 

 wrinkles. The base is tumid, and imperforated. The 

 mouth is large, broader than it is long, and not dis- 

 tinguished by any sculpture whatsoever ; the hinder angle 

 of it is an obtuse one ; the outer lip is very acute ; the 

 pillar is broad, strong, arcuated, and white. In a Medi- 

 terranean example, however, it is edged behind with rufous 

 and tinged with pink. 



The animal is much larger in proportion to the shell 

 than that of any other native Trochus. It is of a general 

 whitish hue, with brown markings. The head terminates 

 in a strong and thick muzzle, much speckled with brown. 

 On each side is a subulate smooth tentacle, marked with a 

 brown line down its centre. The eye-peduncles are stout 

 and white, and the eyes blue. The head-lobes are nearly 

 obsolete. The neck-lappets are very large, white, and 

 even, or only obsoletely crenated at their edges. The 

 lateral lobes are white, rugosely cremate, and bear three 

 white filaments at each side. The sides of the foot are 

 very broad, and thickly speckled with brown. The very 

 large toot is lanceolate truncate in front, with mucronated 

 angles, and terminating in a point behind. 



This handsome shell is very local, and appears to be 



