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. Twospecies are foundin S, America. 
Six species. 
Sigaretus convexus Sigaretus cancellatus. 
S. Haliotoideus. S. levigatus. 
S. perspectivus.* S. maculatus.* 
2. Genus Stomatella. Pl. XI. 
Animal. 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. Pl. 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. Pl. 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; thetwo 
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. 
