CHEMNITZIA. 441 



extends to the bottom of the second basal volution ; anteriorly 

 it forms a concave sweep, ending on the right and left in very 

 slight auricular points ; posteriorly it has a moderate lanceolate 

 shape, carrying, on a simple lobe close to its junction with 

 the body, a light corneous, pyriform, obliquely-striated oper- 

 culum. This elegant little creature is very vivacious, and 

 free from shyness. 



Habitat : muddy ground, in 10 fathoms water, six or seven 

 miles from the land, off Exmouth. 



It is one of the undescribed species. 



CH. INSCULPTA, Montagu. 

 Odostomia insculpta, Brit. Moll. iii. p. 289, pi. 96. f. 6; and iv. p. 280. 



The animal occupies an ivory-white shell of five moderately 

 rounded volutions, with well-marked, but not oblique, sutural 

 lines ; the three lower whorls at the basal portions have very 

 fine, distant, either concentrically circular or spiral striae. 

 The colour is opake frosted- white, with a rather large patch 

 of dull claret-red on the neck. The mantle has the usual 

 fold at the upper angle of the aperture. The rostrum is 

 short, cloven nearly to the eyes, with the segments arcuatmg 

 as in C. obliqua. The tentacula coalesce at their bases, and 

 are very broad and short, which condition may, in some 

 measure, be owing to the margins not being folded in the 

 auriform fashion on the march ; they terminate in very small, 

 white, slightly inflated tips ; the eyes are close together at the 

 internal bases. The foot appeared short and broad as the 

 animal moved in slow march, but perhaps, if the pace had 

 been accelerated, it might have been somewhat extended ; in 

 front it is gently concave, with blunt auricles, close under 

 which it becomes a little constricted, and terminates in a deep 

 regular emargination carrying on a plain lobe a remarkably 

 thin, light horn-coloured, narrow, subelongated, obliquely- 

 striated operculum. 



It inhabits a shelly bottom in 14 fathoms water, six 

 miles from shore at Exmouth. It has not been examined 

 before. 



