A7iimal of HelicolimoK Lamarckii. 34 1 



ling about one fourth of the length of the entire animal. Spire very 

 short, depressed, flattened or scarcely at all raised, and then very obtuse ; 

 its volutions are convex, with the suture distinct. Aperture very large, 

 broader than long, elliptic with the exception of a segment taken out by 

 the projection into it of the spire. True axis or columella none, but the 

 inner lip is a mere continuation of the outer one in a simple, spiral, acute 

 line. The whole internal cavity of the shell is in some specimens visible 

 to the very apex as in Bullcea aperta. Peristome simple, acxite, with 

 generally a thin membranaceous border or rim slightly turned inwards, 

 which is broadest along the upper part of the outer lip and towards the 

 irmer part of the aperture. This is the state of the shell represented by 

 Ferussac t. ix. f. 9. The border or rim is merely the latest portion of 

 increment to the shell, varying in breadth and sometimes entirely want- 

 ing. The surface of the volutions is rendered slightly uneven and 

 wrinkled by the irregular transverse strite of growth. 



The head, neck, and tentacula of the animal are granulated ; with two 

 very distinct grooves close together down the middle of the neck, begin- 

 ning between the upper pair of tentacula, and an intermediate raised black 

 granulated line. The cuirass is strongly vnrinkled concentrically like the 

 lines at the end of the fingers. The sides of the posterior extremity are, 

 as before described, divided into regular compartments by equidistant 

 lines running obliquely from the closed groove or keel dovm its centre to 

 the edge. 



The general ground-colour of the animal is either cinereous or a very 

 pale reddish brown ; the tentacula and fore part of the head and neck ren- 

 dered dusky by the dark granulations. The cuirass is more or less mot- 

 tled by large confluent, often distinct, black or dark brown spots or 

 patches. The posterior extremity is of a uniform dusky brown, sometimes 

 olivaceous. The sides are pale cinereous brown. The cuirass and 

 posterior extremity are sometimes also sprinkled with minute, opake, 

 milky dots. 



The animal is very slightly viscous ; the mucus is hyaline. 



Length of the largest specimen seen 1^ inch; of this the tail was ^ an 



inch. It is found of all sizes from this to i of an inch in length ; the usual 



size is that of the specimen figured. When the animal is at rest, the 



<^uirass occupies two-thirds of the whole length ; when it is crawHng, 



