173 



well over the labial side, and also over the labium, not concealing 

 the lovvest part of the operculum, but showing the lowest part of 

 the labial side to be broad and spreading, — trumpet-shaped. Un- 

 fortunately I possess but two specimens, only one having the oper- 

 culum, which is so firmly fixed in the shell that I darė not further 

 attempt its extraction, and therefore I cannot further examine its 

 extraordinary structure. 



Height 0-034, greatest breadth 0-066, least breadth 0-049. 



Named in compliment to Captain George Abbott, of the R.W.I. 

 Steam Mail Company's Service (at present commanding the ' Mag- 

 dalena'), for his great care and attention in procuring and pre- 

 serving specimens of natūrai history for the Zoological Society of 

 London. 



WiLKiNSON.EA Jardineiana, Chitty. 



Hab. Snift Rirer Head, St. George's. 



Form, subdiscoidal. Colour, very pale horn. Sculpture, lines of 

 growth visible ; seven strong spirai carinse, without intervening fine 

 ones ; three strong, on upper whorls. Spire, slightly elevated, with 

 concave outlines. TFhorls, 4, moderately convex, with a hghtly im- 

 pressed suture ; lašt whorl wliolly detached from the penult, extend- 

 ing about one-third the widest breadth of the shell beyond it, and an- 

 gularly and pointedly produced above. Aperture, slightly constricted 

 about the point of attachment to the penult whorl, then bulging or 

 swelling out and becoming slightly constricted at the labrum ; semi- 

 elliptic, but modified by the below-mentioned depression of the 

 labrum, and production of the lašt whorl, and also, in a correspond- 

 ing degree, on the lower side. Labrum, produced above to an extra- 

 ordinary degree at the second carina, and there very much depressed 

 or bent inwards, thickened and reflected ; very slightly scoUoped by 

 the spirai carinae. Labium, much detached from the penult whorl ; 

 upon a plane with the lower part of the labrum, but much below it 

 above ; slightly sinuate above, and very much so to the right at its 

 junction with the labrum below. Umbilicus, moderately deep, only 

 partially concealed by the labial lainella, which is narrow and shortly 

 incurved towards the umbilicus. Operculum, ? 



Height 0-024, greatest breadth 0-059, least breadth 0-042. 



Named in compliment to my friend Sir William Jardine, Bart., of 

 Applegarth. 



WiLKiNSONJEA Greenwoodiana, Chitty. 



Hab. ? Hanover. 



Form, subdiscoidal. Colour, pale horn. Sculpture, lines of growth 

 visible ; three fine spirai carinse and one strong, and so on until the 

 fifth strong carina, below -vvhich, round the umbilicus, are six fine 

 carinse ; on the upper whorls one strong in the centre of six fine 

 carinse. Spire, depressed veith convex outlines. TFhorls, 3f, slightly 

 convex, with lightly impressed suture. Aperture, separated from 

 penult whorl in an elegant curved line, more than semicircular, 



