TRIBE MALLEACEA. 2.57 



C. Avicularis. Lam. 1. — Bl. t. 63. f. 4. — An. du mm. vol. 

 3. t. 2v/. 1,2. — Ostrea Semiaurita. D.p. 281. t— GmeL 8385? 



— W.t. liy. 77? Rounded- rhombic, compressed, submembra- 

 naceous, blackish with many white rays, no sinus at the base. l£ 

 . . If . *S* America. 



C. Modiolaris. Lam. 2. — Del. t. 14. f. 2. Somewhat wedge- 

 shaped, compressed, submembranaceous, reddish rufous, with a 

 few white rays : beaks lower than the dorsal line, separated by a 

 sinus. 2^. New Holland. 



C. Nigrina. Lam. 3. — C. Avicularis. Sow. G.f. 1,3. — Reeve. 

 t. 105./. 1. — Ostrea Picta. W. t. 11, f. 82. Subovate, com- 

 pressed, violet black, subradiated by very fine white lineoles : beaks 

 minute and lower than the dorsal line. 2-f . in length. Australia. 



C. Bicostalis. Lam. 4. Suboval, flat, blackish blue, upper valve 

 with two longitudinal somewhat acute ribs : beaks terminal. Length 

 3J-. New Holland. The original specimen in the French museum 

 seem* only an aged Nigrina. 



C. Viridis. Lam. 5. — E. vol. 2. p. 24. Ovate-oblong, some- 

 what irregular, being unequally convex above, flattish concave be- 

 low: greenish glaucous, dorsal edge with a somewhat tongue-shaped 

 obliquely produced appendage ; beaks terminal. 4. Australia. 



C. Mytiloides. Lam. 6. («?ic?Phasianoptera. Lam. 7.) — 

 E. vol. 2. p. 24. — Ann. du Mus. vol. 3. p. 2. f 3, 4. — Sow. G. f. 

 2. — Reeve, t. 105. /. 2.— Ostrea Picta. Gmel. 3399.— B. p. 

 283. Oblong ovate, acute at the base, thin, violet with obscure 

 rays ; beaks internally, with crowded vaulted lamella 1 . 2. Red 

 Sea. 



C. Folium. Gray, Ann. Phil. 25. — Brande Journal, 15. t. 2.f. 

 81. — Mytilus F. W. S. t. 2. f 4. Ovate, whitish, rayed, com- 

 pressed, anteriorly rounded, posteriorly winged. 



PERNA. 



Subequivalve, flattened, slightly distorted, of a lamellar texture ; hinge 

 linear, marginal, composed of many furrow- like, parallel, and trans- 

 verse teeth, not inserted in the opposite furrows, between which the 

 ligament is seated ; sinus for the byssus, somewhat gaping, pos- 

 terior, and placed under the extremity of the hinge, its sides callous. 



P. Ephippium. Lam. 1. — E. t. 176. f. 2. — Ostrea E. Lin. 

 1149.— /)./?. 282.— Ch. f. 576.— List. t. 257. /. 62.— Klein t. 8. 

 f. 18. — W. t. 11./. 80. Greatly compressed, purplish brown, as 

 broad as long, the hinge margin short, terminated anteriorly in a 

 rounded off rectangle, from whence the edge runs in a dilated shal- 

 low sinus, to the semiorbicular ventral margin ; posterior side the 

 more produced, much incurved towards the beal<s : internal nacre 

 purplish, margins very acute. Far. (from Australia).. Whitish 

 spotted with violet. 5. India)) Ocean. 



