303 



not quite round, annulated, or flreaked trannv,riciy wuii 

 black : eyes at the bafe of the tentacida, prominent. 



« 

 11. 

 T. with a ftrong, (liort, conic (hell, nearly as broad asTKXEBRosus. 

 it is long; of a dark chocolate-brown, with five, rather 

 .ventricofe, fpires: the lower volution occupies half the 

 length of the Iheil: apex obtufely pointed: aperture fub- 

 ■otbicular; outer lip thin, except at the lower angle, where 

 it fpreads a little, and from thence continues to thicken on 

 the pillar lip; infide very dark purplii'h-brown. Diame- 

 ter a quarter of an inch. 



This littoreal fpecics, is found on the mud, and on rocks 

 near high -water mark, and even in ditches fubjett to the 

 daily flux of the tide. 



We had for a long time confidered this fiiell a variety of 

 the young T. littoreus, or T. rudis ; but late obtervations 

 have inclined us to think it diftinrl ; it is therefore given 

 a feparate place, but not without fome doubt. 



It is by no means fo common, having at prefent only 

 found it in one or two places on the coal! of Dcvonjliire, 

 and once obtamed it from Kent : and have obferved, where 

 it was mod plentiful, no littoreus or rudis occurred. The 

 colour is invariably darker than either of thofe (liells, and 

 without markings of anv kind: it is faintlv wrinkled acrofs 

 .the fpires, but rarely fpirally llriated as in the young lit- 



tor cm. 



