malacozoa. gasteropoda, tectibranchiata. 189 



it having been accidentally in company with a shell sent to hhii 

 for inspection. 



Bulla Cranchii. nem. Brit. Annn. 292. 



2. Bulla Candida. Glossy Bulla, 

 Shell broadly ovate, thin, semitransparent, glossy, with faint 

 growth-lines ; the apex prominiilous, obtuse, two very small 

 volutions being apparent, but with a slight scrobiculus ; the 

 aperture wide, ovato-oblong, acute behind, the columellar 

 margin a little thickened and reflexed, the outer margin thin ; 

 the colour white. Length two-eighths, breadth more than 

 half the length. 



Found by me in shell sand from the beach near Aberdeen* 

 Diaphana Candida, Brown, lilustf. PI- 38. f. 13, 14. 



Genus 3. Halia, 



Shell sub ovate, spiral ; the spire short, convex, ob- 

 tuse ; the turns rapidly enlarging, separated by an im- 

 pressed suture, the last very large, tumid ; the aperture 

 large subovato-trigonal, acute behind, anteriorly curved 

 outwards and ending in a rather wide notch, the outer 

 lip thin, the inner formed by the thin-edged sinuous 

 columella before, without peristome or umbilicus. 



This genus, instituted by Risso, is correctly placed 

 by him in the family of '* Aceres," and between the 

 genera Bulhna and Accra. But its affinities, one might 

 at first think, to be most obviously among the Bucci- 

 nina and Fusina. The form of the mouth is, in fact, 

 almost the same as that of a young, thin-lipped Bucci- 

 num undatum of the same size. 



1. Hdlia Flemingidna. Fleming's Halia. 

 Shell subovate, thin, brittle, glossy, semitransparent ; of four 

 turns, which are convex, obsoletely striated longitudinally and 

 transversely ; the apex very obtuse ; the suture distinct ; the 

 aperture two-thirds of the whole length, subovato-trigonal, 

 acute behind, the thin-edged outer lip forming the fourth of a 

 circle, the inner side sinuous, its posterior half formed by the 

 body-whorl, the anterior by the thin flexuous edge of the colu- 

 mella, the anterior extremity curved to the left in the form of 

 a short and rather wide canal ; the colour pure white. Length 

 seven-twelfths of an inch, breadth half the length. 



