304 MURICIM. 



brown : epidermis brownish-yellow, moulded on the longitu- 

 dinal sculpture, more adhesive or persistent than in the last 

 species : spire turreted, short ; apex depressed, and smooth, 

 consisting of an incomplete turn : whorls 5-6, convex, strongly 

 angulated by the varices, and compressed upwards ; the last 

 occupies three-fourths of the shell : suture deep, interrupted 

 by the varices : mouth narrow, acute-angled above and below, 

 contracted at the upper corner by a tooth on each side, so as 

 to leave an excavation like the top of a key-hole ; length, 

 exclusive of the canal, about two-fifths that of the whole 

 spire : canal narrow and contracted, ending outside in a rather 

 deep and oblique notch with a thick edge : outer lip nearly 

 semicircular ; that part which consists of the last-formed rib 

 is flat, thick, and strengthened by a continuation of the spiral 

 ridges ; the inside of the lip is furnished with 7 or 8 strong 

 tuberculated plaits, the spaces between which, where the lip 

 is inflected, are deeply excavated : inner lip broad and rather 

 thick, united above with the outer lip, reflected over the lower 

 part of the pillar, behind which there is a shallow groove ter- 

 minating in a small umbilical hole, caused by the superposition 

 of the new mouth on that of the prececting whorl: pillar 

 broad, shelving inwards, curved above, and sloping below to 

 the left ; close to the upper corner of the mouth is a tooth or 

 short tubercular plait, and frequently another minute tooth 

 just below it ; at some distance within may also be detected 

 four or five ridge-like plaits ; the lower part of the pillar is 

 indistinctly corrugated or wrinkled across : operculum obliquely 

 oval, yellowish-brown or horncolour, rather solid ; layers of 

 growth numerous. L. 2-4. B. 1-7. 



HABITAT : Guernsey, dredged by Dr. Lukis and Mr. 

 Barlee; from a crab-pot (Macculloch) ; taken by Mr. 

 John Rougier on a large flat stone at the extreme verge 

 of the lowest spring tide, while gathering ormers (Halio- 

 tis tuberculata) in the island of Lihou (Dr. Lukis) : 

 dead shells have also been found by Mr. Lukis and others 

 on the beaches at Guernsey and Herm. Forty years 

 ago Dr. Turton recorded the capture of this species at 

 Padstow, and afterwards at Falmouth and Guernsey; 

 but the Cornish localities have not been verified by any 

 subsequent discovery. For my specimens I am indebted 



