512 TROCHIDJE. 



base. The ground of the shell is dirty white, or ash- 

 coloured, and the raised spiral sculpture is articulately 

 painted with ochraceous or rufous brown lines, that pre- 

 sent the appearance of longitudinal flexuous linear streaks, 

 and, indeed, are occasionally continuous ; besides these, 

 there are in certain individuals, a few larger remote spots 

 beneath the well defined sutures. The base, whose surface 

 is a little rounded, especially near the lip, is angulated, 

 though not very sharply, at its outer margin : its axis 

 is imperforated. The aperture is subquadrate, and its 

 breadth is not very much more than its length, the 

 former being half that of the basal diameter, the latter 

 occupying one-third of the total length of the shell. It 

 has no peculiar sculpture ; the outer lip is simple, acute, 

 and somewhat arcuated anteriorly ; the pillar is nearly 

 perpendicular, not much spread, and becomes rather 

 broader as it approaches the former. A rather fine speci- 

 men measured three-eighths of an inch in length, and one- 

 third less in breadth. 



The animal is white, with black markings. The head 

 bears long white tentacula and white eye-peduncles, with 

 black eyes. The capital lobes are minute. The neck- 

 lappets are white; the sides of the foot much marked with 

 black. There are three slender white cirrhi on each side. 

 The foot is lanceolate with obtuse angles anteriorly. 



So far as known this Trochus is almost peculiarly 

 British, and even on our shores is not found everywhere. 

 On the east coast of England it is recorded by Mr. Bean 

 from Scarborough. On the south it ranges to the Channel 

 Isles, where it is dredged at Herm (S. H.); in from seven 

 to twenty fathoms west bay of Portland (M'Andrew and 

 E. F.) ; Exmouth, Fishguard (Jeffreys) ; not rare in the 

 Irish sea ; in fifteen to twenty fathoms on the Welsh 



