i$8 HELICID&. 



three prominent curved ones on the inside of the outer lip 

 there are sometimes one or two small intermediate tubercles ; 

 the number of the teeth, however, is not constant ; outer lip 

 flexuous, slightly reflected, strengthened outside at a short dis- 

 tance from its margin by a rib ; inner lip spread on the base 

 of the penultimate whorl, and in full-grown specimens con- 

 tinuous ; umbilicus distinct, but narrow. 



Inhabits many parts of Great Britain, in marshy 

 places under stones and timber, as well as at the roots of 

 grass, moss, and other plants ; but its habitat does not 

 seem to be restricted to such situations, for it has been 

 found in East Lothian at a height of 1 200 feet above 

 the sea-level. 



This little mollusc is rather slow in its movements ; 

 Moquin-Tandon says it carries its shell in a nearly 

 upright position, swaying it from side to side when 

 crawling. 



The shell is not furnished with its full complement 

 of teeth until the animal is full grown ; immature 

 specimens have only one tooth on the base of the pen- 

 ultimate whorl and another on the pillar. 



2. V. MOULINSIA'NA,* DUPUY. PL. IX. 



" Body smooth, shining ; colour above, dark grey, with darker 

 streaks arranged lengthwise ; below of a much paler hue, and 

 interspersed with numerous irregular microscopic black specks ; 

 mantle thickish, greyish-white, protruded like a short collar ; 

 snout hood-shaped, closely wrinkled across, in front gently 

 rounded, or very slightly indented on each side, so as to make 

 that part trilobular ; mouth small, triangular, placed under- 

 neath the snout in the middle ; tentacles club-shaped, folding 

 inwards, diverging at a right angle, having a faint tint of 



Named after M. des Moulins, a French conchologist, 



