106 MOLLUSCA.^' 
tootli en chevron ; but the lateral plates are wanting ; the gap of the 
valves is very wide, particularly at the posterior extremity, through 
which passes the thick, double, fleshy, respiratory and anal tube, a 
disposition which attaches them to this family. The foot, which 
issues at the opposite end, is small and compressed. 
Some of them are found in the sand at the mouths of rivers in 
France * * * § . In the 
Mya, Lam., 
Or the Mya properly so called, one valve is furnished with a plate 
which projects into the other, and this latter with a cavity. The liga- 
ment stretches from this cavity to that plate. 
Some species are found in the sand along the coast of 
F ranee f . 
Anatina, Lam. 
The Anatinae of Lamarck should be approximated to the preceding 
Myae. Each of their valves has a small projecting plate inside with 
the ligament extending from one to the other. 
One oblong and excessively thin species is known, tlie valves 
of which are supported by an internal ridge ^ ; and another of a 
squarer form without the ridge §. In the 
Solemya, Lam. 
The ligament is seen on the outside of the shell, part of it remaining 
attached to a horizontal internal cuilleron on each valve. There is 
no other cardinal tooth, and a thick epidermis projects beyond the 
edges of the shell. 
One species, the Tellina togata, Poli, II, xv, 20, is found in the 
Mediterranean ||. 
Glycymeris, Lam . — Cyrtodaria, Daud. 
Neither teeth, plates, nor cavities on the hinge, but a simple callous 
enlargement, behind which is an external ligament. The animal re- 
sembles that of the Myae. 
The most common species — Mya siliqua, L.; Chemn. XI, 193, 
f. 194, is from the Arctic Ocean. 
* Mactra lutraria, List., 415, 259 ; Chemn., VI, xxiv, 240, 241 ; — Mya ohlonga, 
Id., Ib., ii, 12 ; — Acosta, Brit. Conch., XVII, 4 ; Gualt., 90, A, fig. min. 
t Mya fntneafa, L., Chemn., VI, i, 1, 2; — M. arenuria, Ib., 3, 4. 
J Soten anatinus, Chemn., VI, vi, 46 — 48. 
§ Encyc., 230, 6, under the name of Corbule ; — An. hispidula, Cuv., An. sans vert., 
Egyp. Coq. pi. vii. f. 8. I suspect that the Rupicol.e of F. de Bellevue (Voy. 
Roissy, VI, 440) must approach this suhgenus. They live in the interior of stones, 
like the Petricolce, Pholades, &c. 
II New-Holland furnishes a second species, the Sol. australis, Lam, 
