108 LITTOKINlDJi. 



total length is as three to seven, is nearly ovate, a little 

 contracted above, and well rounded below. The peristome 

 is continuous, and of a lilac or violet brown hue ; the 

 throat is smooth, and of a pure white. The outer lip is 

 thickened externally by a very broad white varix-like rib, 

 that is usually stained with fulvous brown, at its base, and 

 near the outer edge, but is never marked posteriorly with 

 the arcuated coloured line of the allied parva (neither is 

 there any spiral band at the base of the shell). It is not 

 very convex above (where it is somewhat projecting), but 

 curves rather abruptly below, so as to quickly attenuate 

 the extreme base of the body ; before the formation of the 

 varix, it has a tendency to expand. The inner lip is much 

 spread upon the parietal surface, and is appressed and 

 somewhat reflected below : the pillar-lip is rather long and 

 almost perpendicular (though curved) ; there is no umbi- 

 lical crevice. A foir-sized example measured two lines 

 and a half in length, and a line and a third in width. 



The animal, of which a drawing has been kindly com- 

 municated by Mr. Alder, has the head, muzzle, margins of 

 the much developed lateral lobes, and the central sides of 

 the foot tinged with rich dark brown. The tentacles are 

 subulate, white with a yellow line ; the eyes are placed 

 within white spaces on the bulgings at their external 

 bases. The foot is somewhat rounded in front, pointed 

 behind, and bears at the extremity of the operculigerous 

 lobe a rather long caudal filament. 



It is a southern and western species. Brighton and 

 Torquay (Alder) ; at Ryde along with labiosa, and at 

 Torquay along with parva^ but not common (S. H.) ; 

 Oban, Loch Fyne, Loch Carron, and elsewhere on the 

 west coast of Scotland (Jeffreys). " On the east, west, 

 and south coast of Ireland : I obtained it at Bangor in 



