CONCHIFERA. 751 



Anatina LAM. Shell free, subequivalve, transverse, thin, fra- 

 gile. Impression of mantle sinuate posteriorly. Animal with two 

 tracheae coalesced. 



Sp. Anatina subrostrata LAM., Solen anatinus L., BUMPH. Amb. Rariteitk. 

 Tab. 45, fig. o, BLAINV. Malac. PL 78, fig. 6, DESH. Concliyliol. PL 8, 

 figs. 2023 ; in the Ind. Ocean, &c. Also of this genus fossil species 

 occur in different secondary and tertiary strata. 



On the animal of this genus of conchifers, comp. H. MITTRE M6m. s. I. 

 genre Anatine? GUERIN Magas* de Zool. 1844, Moll. PL 102 104. 



Periploma SCHUMACHER, DESH. 

 Osteodesma DESH. 

 Lyonsia TURTON, DESH. 



Sp. Anatina norvegica SOWERBY, Amphidesma corbuloldes LAM., Mya nor- 

 wegica CHEMN. Conchyl. Tab. 170, figs. 1667, 1668, DESH. ConcJiyl. PL 

 8, figs. 1214. 



Myadora GrKAY. 



Phalanx II. Myacea. Ligament internal, fixed to a fovea of 

 each valve or to a cochleariform process of one valve and a fovea of 

 the other. Tracheae coalesced into a fleshy thickened cylinder. 



Pandora BRUG. Shell inequilateral, thin, inequivalve, right 

 valve flat, left slightly convex. Hinge in flat valve guarded by an 

 exsert tooth, other valve emarginate to receive the tooth. Ligament 

 received in a pit behind the hinge on each side. 



Sp. Pandora rostrata LAM., Tellina incequivalvis L., BLAINV. Malacol. PL 

 78, fig. 5, Cuv. R. Ani. } ed. ill, Moll. PL no, fig. 3; Medit. ; this species 

 occurs fossil in the crag-formation of England. There are also two other 

 fossil species from the tertiary formations, and some from the Indian Sea 

 known. 



Corlula BRUG. Shell inequivalve, with right valve more con- 

 vex. Cardinal tooth in each valve conical with lateral pit. Liga- 

 ment inserted in tooth of left valve and in pit of right. 



Sp. Corbula nucleus LAM., Mya incequivalvis MONTAGU, Encycl. meth., Vers. 

 PL 220, fig. 4, DESH. Conchyl. PL 8, figs. 7 9; in the N. Sea and Medi- 

 terranean. Within the last few years many species from all seas have 

 become known; the fossil species are even more numerous, and occur 

 some in secondary, but in great part in tertiary strata. 



Ervilia TURTON. Shell inequivalve. Other characters almost 

 those of Corbula. 



Comp. KECLUZ in GUERIN Magas. de Zool. 1844, PL 95, 96. 



