BIVALVES—CHAMA. 51 
Famity 1.—With longitudinal ribs, gaping at the posterior slope. 
Scientific Name. Locality. Common Name. 
Gigas ++-++- +++» RedSea,Amboyna,China, 
New Holland -+++++++ Giant Clam-:-: 
Hippopus ---+--+ East Indies, Amboyna, 
@hina, . <2 eyes ssiveielss Spotted --- do -- 
Famity 2.—With longitudinal ribs, posterior slope closed. 
Antiquata---.--. Mediterranean, Gibraltar Antiquated do -- 
Ajar--+++-- +++» Mouth of the Niger, 
Tranquebar -+++++-++- Ajar-eessrs do se 
Trapezia +++ +++» Norway-esesesssererees Trapeziformdo -- 
*Rosea -++++++s » West Indies ----+-++--:- Rose color’d do -- 
Calyculata:---+» East Indies, Mediterra- 
nean, Senegal -------- Variegated do -> 
Pectunculas.:ic262 —o0.0.0.08,0\0 ois clels ee eseceee-- Pectuncle-- do -- 
Satiata>o.ccccecs ee cceerercccces eeeseeee QObsolete--+ do -= 
Rugosa:---+ @eeeee coccenccce os eeecscere @ Rugged-+-+ do -> 
Famity 3.—Shell longitudinally ribbed, having an ovate chamber 
in the interior of each valve. 
Concamerata --++ Cape of Good Hope--:-- Chambered do -- 
Famity 4.—Shell decussated or transversely striated, without ribs. 
Semiorbiculata -- Arabia --+-+-+-++>+ seeess Brown -+++ do «> 
(Cand bimponsasocn IDhimSosenocd6aaboonues Heart-shap’d do «- 
Oblonga --++++++ Guinea, Pulo Condore -- Oblong---+ do - 
Coralliophaga--- East Indies, in coral-- -- Coral ---+ do - 
Famity 5.—Shell tuberculated. 
Plumbea:----- es South Seas.-+---.-. sie) dueaden-«(s' Gort. 
EK2 
