126 CONCHOLOGY, 



S. convexus. The convex Sigaretus. PI. 22, fig. 2. 



Very thin, smooth, back convex, spire white, rather prom- 

 inent ; aperture very expanded ; umbilicus rather deep ; yel- 

 low, with a reddish tinge, transversely striated. 



S. Haliotoideus. The Haliotis-shaped Sigaretus. 

 Species thick, solid, depressed ; spire flaltish, aperture ex- 

 posing the whole of the interior. 



2. Stomatella. Five species. 



To be easily distinguished from the Stomatia by not hav- 

 ing a transversal rib. 



Shell very depressed, orbicular or oblong ; imperforate ; 

 interior pearly ; aperture very large, oval, longer than wide ; 

 the right edge effuse, dilated, and open ; summit pointed and 

 incurved. 



Stomatella imbricata. Stomatella sulcifera. 



S. rubra. S. auricula. 



S. planulata. 



S. imbricata. The imbricated Stomatella. PI. 22, fig. 1. 

 Sub-orbicular, convex, sub-depressed, rough, covered with 

 imbricated scales ; colour grayish brown. 



iS. auricula. The ear-shaped Stomatella. 

 Species oval, elongated. 



3. Stomatia. Two species. 



Bearing a very great resemblance to the Haliotis, but is 

 never perforated. 



Shell ear-shaped, imperforate ; oblong, spire elevated and 

 recurved to one side ; aperture entire, oblong ; interior pear- 

 ly ; tuberculated, and with a transverse sub-carinated rib. 



S. phymotis. The tumoured Stomatia. PI. 22, fig. 6. 

 Elongated oval, striated, tuberculated ; spire small, con- 

 torted ; lip thin and sharp, colour white, interior pearly. 



