GINGLYMACONCHA. PANDORAD. 27/5 
FAMILY VI. PANDORADZ. 
Shells inequivalve ; the hinge with one or two teeth in each 
valve, but no lateral lamelle ; the ligament internal. 
Synopsis Generum. 
Teste regulares breves inzequivalves sub- 
clausze. Ligamentum internum in foveolis 
eeeErie rt. oe ares ern joule 24. CORRE EE 
Teste regulares oblongee ineequivalves, valva 
sinistra planulata ; dextra convexa. Liga- 
metium tternam © 2.727.070... 20.8 25) PaNpora 
Genus 24. CoRBULA. 
Corbula, Lamarck, Cuvier. 
The shells regular, inequivalve, inequilateral, nearly closed ; 
the hinge with one conic, curved, ascending cardinal tooth, 
with a lateral fovea or excavation in each valve; but no late- 
ral lamelle; the ligament internal, situated in a foveola or 
little excavation. 
The animal with its tracheal tubes very much elongated 
equally and joined together. 
CoRBULA NUCLEUS. 
Shells globosely-trigonal, concentrically striated, somewhat 
antiquated ; the left umbo more gibbose than the right valve. 
Length half an inch ; height three-eighths and half of an inch. 
Mya ineequivalvis, Walk. Test. Min. Rar. t. iti. f. 87 ; Mont. 
Test. Brit. 38; M. & R. Trans. Linn. Soc. vii. 40. t. 1. 
f.6; Flem. Edinb. Encycl. vii. 88; Dill. Desc. Cat. 145; 
Turt. Conch. Dict. 107. 
Corbula nucleus, Lam. Hist. Nat. des Anim, sans Vert. v. 
496. 
