118 CONCHOLOGY. 



pressed, with a short, low, lateral spire ; left edge of the aperture 

 trenchant; two lateral muscular impressions very distant. In- 

 habits the Indian Ocean. Two species are found in S. America. 

 Six species. 



Sigaretus convexus Sigaretus cancellatus. 



S. Haliotoideus. S. la^vigatus. 



S. perspectivus.* S. maculatus.* 



2. Genus Sto7natella. PI. XI. 



Jinimal. Unknown. 



Shell. Distinguished from the Stomatia by being destitute of 

 a tranverse rib, orbicular, oblong ear-shaped, imperforate ; aper- 

 ture entire, large, sublongitudinal ; right lip effuse, dilated, open. 

 Inhabits the Indian Ocean. Five species. 



Stomatella imbricata. Stomatella sulcifera. 



S. rubra. S. auricula. 



S. planulata. 



3. Genus Stomatia, PI. XI. 



Animal. Unknown. 



Shell. Ear-shaped, imperforate, spire prominent ; aperture en- 

 tire, large, oblong ; right margin aad columella equally raised ; a 

 transverse and tuberculated rib on the back. Inhabits the Indian 

 Ocean. Two species. 



Stomatia phymotis. Stomatia obscurata. 



4. Genus Haliotis. PI. XI. 



Animal. Body oval, much depressed, slightly spiral poste- 

 riorly, provided with a large foot doubly fringed at its circum- 

 ference ; head depressed ; tentacula a little flattened ; eyes at the 

 summit of prismatic peduncles situated at the external side of the 

 tentacula ; mantle very thin, deeply slit at the left side ; the two 

 lobes pointed, and forming by their union a kind of canal to con- 

 duct water into the branchial cavity, and including two very long 

 unequal branchial combs. 



