34 BIVALVES ——.MACTRA. 
form, and has a small hollow on each side; and though 
it is very strongly articulated in some species, the teeth 
are universally thin and fragile. The interior margin 
is rarely crenated or toothed. 
The Mactra is derived from paxroa, a kneading 
trough. 
Diviston I.—Shell sub-angular. 
Famity 1.—Having « smooth surface. 
Scientific Name. Locality. Common Name. 
Spengleri --+---- Cape of Good Hope ---- Spengler’s Mactra 
* Carinata --- -- Mediterranean --------- Keeled --+- do:: 
Maculata-+-++--- Nicobar Isles ---+ +--+ ++ Spotted --- do -- 
Corallina:- +--+ -- Mediterranean, Guinea-- Banded---+ do -- 
Lactea+ --+-+--- Tranquebar «+--+ -++++- Milky «+++ do-- 
* Cinerea -+-+++:> Eat teams fic texeses yok siesevores etene Ashy ----- do - 
Stultorum--+ --- lMateitiGone soso daddaco Foolish ---- do «« 
Grandis -- «+--«- * New Jersey elie Jeela/s)e\eialete Great -.-:.- do -- 
Acchatiniante vr. sem iariasyacte pete Sk Ne a keene Agate. as dor gdore 
Triangularis seeee Boxitiaittivic ie): cual cells, toteuneifer scare Triangular do - 
NVEINITILISSIIMATsToleyeler tater aterelevelciareteeiemier als eeceee Minute --- do- 
Donaciformis «+++ Ceylon atolerenayels pialerelslelalere Donax ---- do-: 
Famity 2.— Having a striated or wrinkled surface. 
Striatula --.... - W.Indies, Mediterranean Striated --- do -- 
Plicataria -----+. Indian Ocean ----++-.-- Plaited---. do-- 
Papyracea «+--+. Nicobar Isles -..---+-+-- Paper -- -- do-: 
Vitrea «+--+. -eee Ceylon «+++-+-...+- secs brittlenseneoner 
Cygnea «+--+. -. ‘Tranquebar ---+-+------ Swan----- do- 
Turgida----...+- Di ttoieistie(acl caterocrs nce Inflated --- do -- 
Violacea -++--. 5 ADEs dopoobodsoongogode Violet. «+ sscdoue 
Cuneata ---.cee. Dito mesievetscterettastelereie/aters Wedge- she GlOune 
Rotundata - -.-. cescevee Pelatete thal ive sivierabete Roundish -- do - 
Glabrata -.-..-. African Ocean «:++++-e. Smooth --- do -> 
INittGlalavecialsinisreelen | ele siviclelslelslevelcleleleloisintsisili sls Delicate... do -- 
S fla talctlelelereleleraretiiit rele talelolta\oletolalclotererstelcialelete Striated --- do «> 
Radiata -+++-sece Britain eceerspenensecaes Rayed-+++- do -- 
