42 LITTORINID.E, 



fairly enough agree with the Turbo jugosus of Montagu's 

 description (Test. Brit. vol. ii. p. 586. — Maton and Rack. 

 Trans. Linn. Soc. vol. viii. p. 158, pi. iv. fig. 7, probably. 

 — DiLLw. Recent Shells, vol. ii. p. 820, probably. — Brown, 

 Illust. Conch. G. B. pi. x. fig. 16, probably), but not with 

 his representation of it in the Supplement. The Litto- 

 rina jugosa of writers seems to be constituted from the 

 strongly ridged varieties of the three species just men- 

 tioned by us. 



The animal of this Littorina does not appear to present 

 characters which will enable us to pronounce it distinct 

 from rudis. It inhabits muddy flats and inlets all round 

 our coasts, and has a distribution correspondent with that 

 of its preceding congeners. 



a rich fawn colour at the edge ; pillar lip broadly reflected on the columella, a 

 little concave in the centre, and of a brownish purple colour ; the whole exterior 

 surface covered with zigzag markings of a deep reddish brown, and dull wood- 

 brown, yellowish towards the margin of the lip ; a few obsolete lines of growth 

 can be discerned crossing the body. Length, nearly five-eighths of an inch; 

 breadth, nearly half an inch. Found by James Macdonald, Esq., adhering to 

 stones near high-water mark, in Clew Bay, county of Mayo, on the west coast of 

 Ireland. 



" We have also received a variety, which is obsoletely sulcated spirally on the 

 body, with the apex a little more acute, and the depression on the upper part of 

 the volutions less conspicuous, and having a pale buft' coloured spiral band on the 

 upper margin of the body and volutions, close to tlie suture, and terminating in 

 the apex. 



" This shell is somewhat allied to both the Turho ienehrosus and laliatus ; it 

 differs from the former in being less elongated, and in the body being mucli 

 larger in proportion to the spire ; and from the latter, in the body being less in 

 proportion to the spire, and in the aperture being greatly smaller." 



