164 SEMELIDA. 
lamellar; hinge with an oblique cartilage-pit in each valve; right 
valve with two anterior primary teeth, left valve with a single 
primary tooth; lateral teeth none; pallial sinus deep. 
LEIOMYA, A. Adams, 1864. Shell hyaline, hinge with two prom- 
inent lateral teeth; in other respects identical with Leptomya. 
Nexra adunca, Gould, is the type species. 
ScROBICULARIA, Schumacher, 1817. 
Syn.—Lavignon, Reaumur. Ligula, Mont. Listera, Turton. 
Mactromya, d’Orb. 
Distr.—20 sp. Norway, Britain, Mediterranean, Senegal. 
Fossil, 4 sp. Tertiary; Europe. S. piperata, Gmel. (cx, 39; 
exi; 41). 
Shell oval, compressed, thin; subequilateral; ligament external, 
slight; cartilage-pit shallow, triangular; hinge-teeth small, one 
or two in each valve, laterals obsolete; pallial sinus wide and 
deep. 
Animal with the mantle open, margins denticulated ; siphons 
very long, slender, separate, orifices plain; foot large, tongue- 
shaped, compressed ; palpi very “large, triangular, gills minutely 
striated, the outer pair directed dorsally. ‘Lives buried, verti- 
cally, in the mud of tidal estuaries, five or six inches deep.— 
Monricu. The siphons can be extended to five or six times the 
length of the shell—_DersHayrs. The animal has a peppery taste, 
but is sometimes eaten on the coasts of the Mediterranean. 
Lurricoua (Blainy., 1824), Carpenter, 1865. 
Syn.—Capsa (Bosc), H. and A. Adams. 
Disir.—L. Chemnitzii, Desh. (exi, 42). 
Shell transversely elongately oval, cartilage-pit more vertical 
than oblique, cardinal tooth lamellar. 
Lut. Chemnitzii, Desh., can be considersd as the type. H. and 
A. Adams refer to their subgenus Capsa also a few species, like 
Tell. lacunosa, Chemn., T. spectabilis, Hanley, and some others ; 
these latter must form a subgenus in the Tellinide ; they have 
a subinternal ligament, but not a cartilage. 
racRA, H. and A. Adams, 1858. Shell subtrigonal, somewhat 
attenuated and produced posteriorly, subpellucid, surface of the 
valve divaricately suleated, cartilage-pit oblique, narrow; one 
cardinal tooth in each valve in front of the cartilage-pit ; lateral 
teeth close to the cartilage-process, more prominent in the right 
than in the left valve. 4 sp. Red Sea, Ceylon, Seychelles, Japan. 
(EpALINA, Carpenter, 1866. 
Distr.— GE. subdiaphana, Carp. California. 
Shell inflated, thin, equivalve, equilateral, rounded ; scarcely 
gaping, ligament external, cartilage subexternal; hinge with 
