QUOYIA. 323 



obscura, A. Adams. succincta, A. Adams. 



obsoleta, Mke. sulcata, Born. 



pigra, Forbes. tseniata, Phil. 



planicostata, Sow. undulata, Lam. 



semisulcata, Sow. zonata, A. Adams. 



Sub-gen. hinea, Gray. 



Shell smooth, covered with a brownish-yellow epidermis, 

 whorls flattened ; outer lip thickened, and grooved internally. 



Braziliana, Lam. laevigata, Leach. 



fulva, A. Adams. 



Genus QUOYIA, Deshayes. 



Shell solid, elongately conical; spire produced, the 

 apex decollated, whorls flat, the last subangulated ; aper- 

 ture small, semicircular, slightly notched in front ; colu- 

 mella smooth, rounded, truncate anteriorly, and with a 

 spiral, acute callus towards the hind part; outer lip 

 grooved internally. 



Syn. Y\s%\\ahxdi, Brown. Leucostoma, Swains. 



Ex. Q, decollata, Quoy and Gaimard, pi. 34, fig. 3. 

 Operculum, Q. decollata, fig. 3, «, 3, h. Shell, Q. decol- 

 lata, fig. 3, c. 



In this genus the anterior notch of the aperture is not 

 so distinct as in Planaxis, the columellar lip is not flat- 

 tened, and is furnished with a spiral, callous keel which 

 winds round the hind part. 



