282 APPENDIX. 



only about a fourth more than the length. The body occupies 

 from one-third to nearly two-fifths of the entire length ; it is 

 rather abruptly broader than the preceding coil, and is produced 

 at the base, where its surface is moderately rounded. The apical 

 turn large, blunt, mammillary, and subheterostrophe. The mouth 

 which is disposed to become effuse at the base, where there is 

 a slight sinuation of the edge of the lip, is very ample, occupies 

 two-thirds of the basal diameter, and from rather more than a 

 third to almost two-fifths of the total length ; its shape is sub- 

 ovate, being well rounded anteriorly, and but little contracted 

 posteriorly. The expanded outer lip, which advances at the 

 base, is greatly and continuously arcuated, and projects very 

 remarkably beyond the general outline. The pillar lip is thin, 

 elongated, somewhat narrowly reflected (forming an indistinct 

 chink) and greatly arched, hence there is no angle formed at its 

 basal junction with the outer lip. The extreme length does not 

 much exceed a single line. 



The animal has been described at length by Mr. Clark. It is 

 white with black eyes, not very close together and surrounded by 

 white circles, and has a very pale yellow foot. The tentacles are 

 thick, broad, short, and rounded at their tips. The foot is very 

 short, narrow, deeply bifurcated in front and obtus^e behind. The 

 operculum is suboval, and is bordered with brown. 



This shell was discovered by Mrs. Gulson, who found it at 

 Exmouth. Mr. Jeffreys has it from Sandwich and Weymouth, 

 and Mr. Barlee has taken it at Falmouth, in Lerwick harbour 

 among the Zetland Isles, and plentifully at the Arran Islands on 

 the west coast of Ireland. 



Mr. Barlee has dredged three or four specimens from Lerwick 

 harbour, which very closely approach the present species, yet 

 may possibly prove distinct. One alone seems mature or nearly 

 so, and in that the outer lip is not so prominently expanded ; 

 yet judging from the lines of increase, it would eventually have 

 become so ; the form tapers more regularly (the difference be- 

 tween the breadth of the penult and antepenult turns being 

 evident) the whorls slightly higher, the mouth not so oblique, 

 and the chink more obscure. 



