48 BIVALVES—SPONDYLUS. 
and terminates in a curved and lengthened beak, 
which in most of the genus has ears on each side. 
The usual colors are orange, red, purple, white, or 
brown, two of which are often blended in the same shell. 
The Spondyli are met with in the American, Indian, 
Mediterranean, and other seas, adhering to rocks, corals, 
&c. in groups, often forming large masses; others are 
also found attached to shells. 
This genus has been named Spondylus, from the re- 
semblance which some of its species bear to the head of 
an artichoke (s7ovevAcc). 
Division L—Shell armed with spines or ramifications. 
FamiLy 1.—Sharp spines. 
Scientific Name. Locality. Common Name. 
Geedaropus------ Amboyna, West Indies-- Thorny red Spon. 
Regius el oKelet=lsiialeiete Ifitle), coup OooROdbO0 Coo Royal cence dom 
Aurantius +--+ --- Mauritius--+-- -+++--+- Orange---- do -- 
Citrinus:+----+-- Fast Indies «+--+ ++ ~-+-++- Yellow ---- do -- 
Histrix --++--++ Indian Seas «+--+ --+++- Hedgehog - do -- 
Famity 2.—Having palmated or foliated ramifications. 
Delay OO OdOOO os opagqdcad Mielsleiestclelelelsleione Ee AlMAteg Tones 
Spathuliferus Sond. GooeGd co 5o.d90606ndd05,06 Pied... -«) - 100.6 
IDEA Seboadsoua Wasseaéoes Bielete Teiitereteletsiotere Ducal----: Gower 
Division I1.— Shell unarmed. 
Famity 1.—Upper valve longitudinally striated. 
Anacanthus-- ---- Indian Seas ++ +++++-+ee- Spineless -- do «+ 
Famiry 2.—Valves longitudinally platted. 
Plicatus->-> «++. West Indies:-------- -- Plaited-...-do -- 
