III. Aperture above pointed, externally straight, below rounded, widened 



or eiFuse. 



Mitra papalis, episcopalis, S)-c. 



Obs. Shell generally smooth, the base thick and truncated; 



margin of the outer Up crenated; throat smootli. The smaller 



shells of this division connect the genera Mitra and Colom- 



bella (Lamarck). 



Specific Chakacter. 

 M. testa angustd, basi cancellata; spird plkis carinatis; inter stitiis sulcis 

 transversis confertis; columella A-plkatd; guld 4 aut 5 striis remotis. 



Shell narrow, base cancellated. Spire with carinated plaits, the interstices 

 with slender, crowded, transverse grooves. Pillar of four plaits ; 

 throat with four to five remote stri8e. 



This superb shell is figured from a matchless specimen brought 

 home by that illustrious and lamented patron of science, the late 

 Sir J. Banks, from the Pacific Ocean : it is now, together with 

 his entire collection of shells and insects, in the Museum of the 

 Linnsean Society. 



It is of great rarity, and the present specimen far exceeds in 

 size any I have yet seen. A very perfect one exists iii my father's 

 collection which measures only two inches one line long : it dif- 

 fers slightly in wanting the lower white band and its inferior 

 border: there is also an additional small plait between the se- 

 cond and third, a variation not uncommon in the Linntean Vo- 

 lutes, and which lessens the importance of this character as a 

 specific distinction. 



It is unfigured, and I believe undescribed, unless perhaps in 

 Solander's MSS. In its small state it may have been overlooked 

 as one of the numerous varieties of M. vulpecula ; but the sharp 

 angulated plaitings, the cancellated base, and the numerous 

 faintly-grooved lines on the spire, as well as the more slender 

 and lengthened form, will at once distinguish it : its colours also 

 are \erv strikino- and dissimilar. 



