120 
The hinge at once distinguishes the shell of Dipsas from 
Anodenta, but the animal is probably the same, or is very 
nearly allied to it. 
DIPSAS PLICATUS. “= 
TAB. LIE. ; 
‘Testa viridescente-lutea interne margaritacea iricolore, 
inequaliter alata; ala majore longitudinaliter um- 
boneque transversim plicatis. 
Habitat —— 
Mus. Brit. 
. FOLDED DIPSAS. 
Shell greenish-luteous, internally pearly and irridescent, 
unequally winged ; the larger wing longitudinally, and the 
umbo transversely folded. | 
The specimen from which the annexed figure was taken, 
has fourteen pearls adhering to it, and is preserved in the Bri- 
tish Museum; it formed a part of the collection of Sir Hans 
Sloane ; and is enumerated in the catalogue as ‘‘ a Bohe- 
mian river horse-mussel, with pearls sticking to the shell.” 
In the Museum there are several fragments of the same 
species, with groups of pearls attached to them. 
