146 Zoological Society : — 



has 6 or 7 very slightly raised vertical lamellae curving from above 

 to the left below, with an inner raised margin inclosing the concavity 

 and sloping outwards to the extreme edge of the operculum. — 

 Chitti/. 



Petitia Anthoniana, Chitty. See Stoastoma Jnthonianuniy 

 Ad. Contr. Conch, p. 151 ; Cat. Phan. p. 232. 



Hab. ? Manchester. 



Petitia StevensianAj Chitty. 



Hab. Yallahs Hill. 



Form, globose-discoid. Colour, very light brown. Sculpture, 23 

 well-raised, inequidistant spiral carinse, wider apart below round the 

 umbilicus ; on the upper whorls 7. Spire, slightly elevated, with 

 convex outlines. Whorls, 4, well rounded, with a deep suture. 

 Aperture, subelliptical, well detached from the body -whorl ; slightly 

 constricted and scarcely expanded, and but little deflected below. 

 Labrum, double, outer edge very finely pectinated by the spiral 

 carinse ; inner edge white, smooth, slightly thickened and reflected ; 

 continuous with the labium above, with a slight curve. Labium, 

 almost straight, very slightly curved to the right below, where it is 

 below the plane of the labrum. TJmbilicus, deep. Labral lamella, 

 produced to a saw-like tooth at some little distance below its junc- 

 tion with the labium ; convex externally. Operculum, ? 



Height 0'047, greatest breadth 0-086, least breadth 0-065. 



Named in comphment to S. Stevens, Esq., Bloomsbury Street, 

 London. 



Petitia Fortuneana, Chitty. 



Hab. ? Manchester. 



Form, globose-discoid. Colour, very pale horn. Sculpture, 25 

 spiral carinae, about 8 on the upper whorls. Spire, much depressed, 

 with convex outlines. Whorls, 4, moderately rounded, with a slight 

 suture. Aperture, constricted at about the width of the last whorl 

 from the labrum, and then expanded considerably at about an angle 

 of 30°, expanded above and deflected slightly below ; more than a 

 semicircle. Labrum, slightly double, especially above and below, less 

 so at the periphery ; inner edge smooth, white and shining, broadly 

 but slightly scolloped and finely pectinated by about 5 points ; joined 

 and rounded into the labium above ; much produced angularly and 

 deflected above ; produced from the body-whorl at an angle of about 

 60°. Labium, straight, with a slight curve to the right below ; on 

 a plane with the labrum above, and slightly lower below. Umbi- 

 licus, very deep. Labral lamella, very sharp and narrow, not cover- 

 ing the umbilicus. Operculum, slightly concave, with apparently 

 obsolete bars crossing it horizontally. 



Height 0-043, greatest breadth d-078, least breadth 0'061. 



Named in compliment to Robert Fortune,- Esq., the celebrated 

 Chinese traveller and collector. 



