Lamarck's Genera of Shells. 249 



Type. Sigaretus haliotoideus*. (Helix haliotoidea. Zzran.) 



Shell auriform, back depressed, convex; undulately striated 

 transversely, whitish ; spire very obtuse ; aperture very dilate ; 

 umbilicus covered. Atlantic Ocean. PI. VIII. Fig. 155. — 4 

 Species. 



2. Stomatella t- 



Shell orbicular or oblong, auriform, imperforate. Aperture 

 entire, large, longitudinal ; right margin effuse, dilated, open. 



Distinguished from stomatia, by not having the transverse 

 rib of that shell, nor the right lip so much elevated ; and from 

 the haliotis, by wanting the foramina, or row of perforations, 

 which mark that genus. They are all sea shells, pearly ex- 

 ternally. 



Type. Stomatella sulcifera J. 



Shell sub-orbicular, convex, thin, transversely sulcated, very 

 delicately striated longitudinally, reddish-grey ; furrows rather 

 rough ; spire slightly projecting. New Holland. PI. VIII. Fig. 

 156. — 5 Species. 



3. Stomatia §. 



Shell auriform, imperforate; spire prominent. Aperture en- 

 tire, large, longitudinal ; right and columella lip equally ele- 

 vated. Dorsal rib transverse, tuberculated. 



Distinguished from haliotis by the dorsal rib being imperfo- 

 rate. Sea shells, sometimes very pearly. 



Type. Stomatia phymotis \\. (Haliotis imperforata. Chemn.) 



Shell resembling a haliotis, ovate-oblong, back convex, stri- 

 ated, nodular, silvery; spire minute, contorted; lip thin, acute. 

 Indian Ocean. PI. VIII. Fig. 157.— 2 Species. 



4. Haliotis IF. 



Shell auriform, usually flattened ; spire very short, sometimes 

 depressed, sublateral. Aperture very large, longitudinal, and, 

 in the perfect shell, entire. Disc perforated with holes, dis- 



• Like a haliolis. t Dim. from irJofxa, a mmith. 



i Fuirowed. 3d Species. — Lamarck's type is iS. imbricata. 



5 i'Vom ike same iireek word n,v the hust genus. 



II V%m <f>viJia., a mushroom, or the knotty excrescence of a tree, and ouj, an ear, 



il From a^;, tyii? sea, and iik, an ear. 



