'262 TESTACEOUS MOLLUSC A. 



A. Tarentina.* Lam- 6. — Phil. p. 1Q.—E. vol. 2. p. 99. — 

 E. t. 177. /. 8.— Ch. f 725.— Mytilus Hirundo. Poli. 2 t. 

 32 f. 17 to 2\.—do. var. E. D. p. 321. — A. Aculeata. Risso. 

 Thin, yellowish grey, usually rayed with brown, generally worn 

 smooth, but armed when perfect with numerous very narrow long 

 depressed scales: valves nearly equal in size but not always in 

 convexity : ear prominent, sublanceolate : body narrow, very ob- 

 liquely projecting ; tail rather long, the sinus always more or less 

 profound and obtuse. — 3. Mediterranean, tyc. 



A. Atlantica. Lam. 8. — E. 2. p. 101. — Mytilus Hirundo. 

 Var. A & B. D. p. 321.— TV. t. 12. /. 42.— Gualt. t. 94. B. 

 — Ch. f. 722$.— Adan Sen. t. 15. /. 6. Brown, with the wing 

 broad, rounded, and scarcely oblique: valves unequal in size : tail 

 elongated ; body rounded, small, not very oblique. 2\. — Atlantic 

 Ocean. 



A. Squamulosa. Lam. 9. Thin, fragile, yellowish or red, 

 with a few obsolete cloudy markings, somewhat roughened by a 

 few distant radiating rows of scales ; wing broad and obliquely 

 rounded, tail very short and ear shaped ; anterior sinus shallow. — 

 Base. 1 J-. Brasil. Tiger Bay ? 



A. Papilionacea. Lam. 10. Thin, pellucid, whitish, inter- 

 ruptedly rayed with chesnut or purplish brown, tail almost obso- 

 lete ; body moderately long, somewhat rounded ; ear prominent. — 

 Var. With the rays greenish, spotted with brown. 1 Australia. 



A. Costellata. Lam. 11. Thin, oblong-elliptic, oblique, 

 brownish, fulvous, with minute tubercles so disposed as to resem- 

 ble ribs : hinge short ; no tail : within but partly nacreous. East 

 Indies. 



A. Physoides. Lam. 12. Very thin, very fragile, hyaline 

 and subvesicular, veined with a few ferruginous lines ; the wing 

 very oblique ; tail very short if any. ■£ New Holland on Sertularice. 

 A. Virens. Lam. 13. Very small, thin, smooth, pellucid, 

 greenish, margin somewhat rayed ; tail short and ear shaped. Va- 

 riety. — Ch. 721. With the wing larger and rounder. \ New 

 Holland. 



A. Vespertilio. Desk, in Lam. vol. 7, p. 102. Brownish 

 black, inequivalve, concentrically substriated, with the wing broad, 

 round and scarcely oblique, tail elongated, narrow, fragile : hinge- 

 margin narrow ; nacre reddish ; with two small obtuse teeth and 

 the rudiments of a posterior lateral one. The sinus for the byssus 

 forms a right angle on the right valve. .' 



1 This description is not inapplicable to the Morio of Leach, 

 of whose figure in the Zoological Miscellany, (2. t. 38. f. 2.) we have 



