330 MURICID.E. 



very solid, nearly opaque, and somewhat glossy : sculpture, 

 extremely slight, close-set, and minute spiral striae, which are 

 stronger and more perceptible on the base and near the sum- 

 mit of the shell ; some of these striae in the middle of the last 

 whorl form obscure ridges ; top whorl smooth ; there is no 

 basal ridge or keel: colour pale yellowish- white or creamy : 

 epidermis vcrj thin, light yellowish-brown : sjyire short ; apex 

 bulbous, of an amber tint, larger than in the last species : 

 wJwrls 5-6, tumid ; the last is considerably produced or elon- 

 gated towards the base, and occupies three-fourths of the 

 shell : suture wide and deep : mouth angularly oval, capacious, 

 and widely expanding outwards ; length (including the canal, 

 which appears to be part of the mouth) nearly three-fifths of 

 the shell : caiuil very short, wide, open, nearly straight, and 

 ending in a large and obliquely curved notch : outer lip semi- 

 circular, not contracted above ; edge reflected, and in aged 

 specimens thickened by the addition of many layers ; inside 

 smooth and brilliantly polished, sometimes having at the base 

 a lovely tinge of pale fleshcolour : inner lip usually consisting 

 of only a thin glaze, which is spread over the greater part of 

 the lower side of the body-whorl ; in aged specimens it is con- 

 siderably thickened and folded over the lower part of the pillar 

 and the canal ; it has (as well as the inside edge of the outer 

 lip) a prismatic lustre : pillar gently curved in the middle, 

 and slightly angulated where the canal commences : operculum 

 small, light horncolour, rhomboidal with three rounded corners, 

 the fourth or basal corner being angular and forming the nu- 

 cleus ; layers of increase oblique ; a few slight lines radiate 

 upwards from the base. L. 4-25. B. 2-5. 



Habitat : Coasts of Yorkshire, Durham, and Nor- 

 thumberland, in 50-60 f. (Bean and others) ; Shetland, 

 in fine muddy sand, 70-85 f., at a distance of from 40 

 to 50 miles from land (J. G. J.). The locality of Bute, 

 given by the late Mr. James Smith, must be a mistake. 

 A variety having the spire rather longer, and approach- 

 ing F. Turtoni, occurs in the glacial shell-mounds at Ud- 

 devalla ; Norwich Crag (Middleton and Fitch, fide 

 Woodward) . This species ranges from Spitzbergen and 

 the north-eastern coast of Greenland (Torell) to Norway 

 (Spengler,/6^e Chemnitz, and others), at a depth of 100 f. 



