929, ERYCINIDA. 
pallial line single and radiately grooved, anterior muscular scar 
triangular, posterior oval. 
GALEOMMA, Turton 
ELtym.—Galee, weasel ; omma, eye. 
Syn.—Hiatella, Costa (not Daud.). Parthenopea, Scacchi (not 
Fabr.). 
Distr.—14 sp. Britain, Mediterranean, Mauritius, Pacific. 
Fossil, 1 sp. Pliocene—; Sicily. G. Turtoni, Forbes and 
Hanley (cxx, 1). 
Shell thin, oval, equilateral, gaping widely below; invested 
with a thick, fibrous epidermis; beaks minute; ligament inter- 
nal; teeth 0-1. 
Animal with the mantle-lobes united behind and pierced with 
one siphonal orifice, margins double, the inner with a row of 
eye-like tubercles; gills large, subequal, united behind ; palpi 
lanceolate, plaited; foot long, compressed, with a narrow flat 
sole. 
The Galeomma spins a byssus, but breaks from its mooring 
at will and creeps about like a snail, spreading out its valves 
nearly flat.—CLARKE. 
THYREopsts, H. Ads., 1868. Shell resembling Galeomma, nearly 
equilateral, subtriangular, beaks slightly tumescent, and with 
the whole of the ventral margins widely gaping. G.coralliophaga, 
H. Ad. (exx, 2,3). Mauritius. 
ScinTILLA, Desh. 
Distr.—53 sp. Philippines, North Australia. Fossil; Eocene. 
C. Philippinensis, Desh. (cxx, 4). 
Shell transversely oval, obtusely rounded at the sides, equi- 
lateral, thin, shining, sometimes a little gaping; ligament 
internal, oblique; two diverging cardinal teeth in the left valve, 
one in the right valve; lateral teeth posterior, one in the right, 
two in the left valve; pallial impression simple. 
PassyA, Deshayes, 185. of 
Distr.—P. Eugenti, Desh. (exx, 5). Eocene; ‘Paris Basin. 
Shell regular, modioliform, triangular, depressed, greatly 
gaping on both sides; beaks anterior; hinge short and narrow, 
with a single tuberculiform tooth ; ligament internal? mus- 
cular impressions small, submarginal; pallial line simple. 
LrBratuLa, Pease, 1865. 
Distr.—L. plana, Pse. On coral, Pacific Isles. 
Semilunar, much compressed (like a Placuna), slightly gaping 
all round, cardinal margin crenulated, cartilage median, internal. 
