272 PYRAMIDELLID^. 



seems a little attemuitefl, with a convex declination. The 

 shape of the mouth, which only fills a third or even a still 

 less proportion of the ventral length, is oval-acute, being 

 gradually contracted to a sharp angle above, and rather 

 broadly rounded at the anterior extremity : the throat is 

 devoid of sculpture. The outer lip is simple, acute, and 

 very much more arcuated below than above. The inner 

 lip exhibits no angularity at the junction of the pillar 

 with the base of the penult volution, and is furnished 

 with a tolerably strong subcentral prominent toothlike fold. 

 The pillar lip is moderately arcuated, and scarcely at all 

 reflected. There is no perforation nor umbilical chink. 

 The usual length is only the ninth or tenth of an inch : the 

 basal diameter is about two-thirds less. 



" The animal throughout is pale frosted yellow, inhabiting 

 a light horn-coloured spiral shell of six or seven very little 

 raised volutions. The mantle is simple. The head is a 

 very long flat muzzle with a subcircular terminal very 

 flat disk, issuing between the tentacular veil and the foot, 

 and can be extended to concurrent length with the latter 

 organ. The tentacula are bevelled as the awl, broad, flat, 

 rather larger than in its congeners of the same size, and 

 have their terminations with rounded sublanceolate points ; 

 eyes immersed in the skin at the internal bases, but not 

 quite so close together as in some of the other species. 

 Foot short, truncate in front, slightly notched in the centre, 

 labiated, rounded behind, when at rest somewhat elon- 

 gated, though not much pointed on the march, carries the 

 very light horn operculum, having oblique stria? of growth, 

 on a simple lobe advanced nearly to the junction of the 

 foot with the body. The foot has an inconspicuous cen- 

 tral longitudinal line on the sole. Branchiae and reproduc- 

 tion ? The animal described was taken with many others 



