MACTRA. 



73 



at one margin a delicate, erect tooth like the letter V ; two lat- 

 eral teeth near the central ones. Animal with the mantle open 

 to the siphons, fringed ; siphons fringed ; foot kneed ; outer bran- 

 chial leaflet shortest. 



Mactra solidissima. 



Shell large, massive, strong, oval, covered with a dirty-brown epidermis, sub- 

 equipartite; hinge strong, V tooth delicate; pallial impi-essions slightly indented 

 posteriorly. 



Mactra solidissima, Ciiemn., Conch, x. 350, t. 170, fig. 1656 (hinge). — Dillwyn, Catal. 



i. 140. — Wood, Index, pi. 6, fig. 22. — Conrad, Araer. Mar. Conch. 64, pi. 14, 



fig. 7. — Piiini'Pi, Abbild. t. 1, fig. 2. — Stimpsox, Shells of New England, 20; 



Invert. Gr. Munan, 21. — De K.vy, Nat. Hist. New York, 229, pi. 29, fig. 286. 

 Mactra gigantea, Tuxm., An. sans Vert. vi. 97. — Desiiayes, Encvc. Meth. Vers, ii. 394, 



pi. 259, fig. 1 (1830). — Chenu, 111. Conch, pi. 1, fig. 2; Man. de Conch, ii. 56, fig. 



231. — MiGHELS, Bost. Jonrn. Nat. Hist. iv. 315. 

 Mactra luteoJa, Lovex, MSS. (young). 

 Mactra ponder osa, Philippi, Abbild. t. 1, fig. 1 (1S44). 



Shell very large and solid, transversely ovate, somewhat trian- 

 gular, nearly equipartite, anteriorly a little the shortest, and w^th 



Fig. 387. 



iU. solidissima. 



a fissure between the beaks ; surface slightly folded at tlie lines of 

 growth, covered with a thin, dirty-brown or straw-colored epider- 



