TRIBE MALLEACEA. 263 



A. Savignii. Desk in Lam. vol. 7. p. 102. — E. t. 2. p. 100. — 

 A, Heteroptera. Sow. G.f. 1.— Reeve t. 109.— Ch. f. 2018,9. ? 

 Thin, fragile, blackish brown, oblique, with transverse very fine 

 striae, which become rather scaly on one side : tail short, scarcely 

 longer than the wing. 



A. Brevicauda. Desk, in Lam. 7. p. 102. Oval, subquad- 

 rangular, slightly oblique, thin, fragile, blackish and substriated ; 

 tail very short, broad and obtuse : ear very short ; anterior sinus 

 broad and rather deep : hinge with two small obtuse cardinal teeth 

 and a large and tolerably prominent posterior lateral one. — A link 

 between this genus and Meleagrina. 



A. Georgina. Quoy, Ast. t. 77. f. 10,1. Small, thin, fragile, 

 pellucid, oblong, subquadrangular ; inequivalve, smooth, rather 

 inflated, dark olive green, with either violet spots or small white 

 radiating lines : tail short, ear striated ; internal nacre bluish 

 white, with a copper-coloured iridescence. New Holland. 



A. Livida. Desk, in Lam. vol. 7. p. 103. Small, oval-oblong, 

 obliquely truncated by the hinge margin, which is shorter than 

 the breadth of the shell: livid yellowish white, smooth, depressed, 

 thin and fragile : the right valve eared, no tail, within silvery 

 pearl. 1 



A. Lingulata. Desk, in Lam. vol. 7. p. 103. — E. M. 2. p. 104. 

 Rounded oval, rather solid, flattened, oblique, truncated by a short 

 straight hinge margin, the anterior margin scarcely sinuated at its 

 junction with the ventral one, forming but an obtuse angle and no 

 tail; uniform deep violet-black, smooth: silvery pearl within, 

 with a broad margin of the outer coating. Indian Ocean ? 



A. Ala-corvi — Mytilus A. Chemnitz, vol. 8. p. 144. f. 

 727. — B. p. 322.— W. t. 12. f. 44. Very oblique, brownish 

 black with most elegant radiating white dots : hinge-margin, 

 shorter than the breadth of the shell : ear small ; no tail and 

 scarcely an anterior sinus. 1 \. S. Seas. 



A. Nebulosa. Conr. Journ. Philad. 7. p. 246. Convex, ra- 



given a copy, (W. t. 12. /. -13. — D. p. 322.) The figure having 

 unfortunately being drawn from an imperfect specimen, the space 

 from the beak to the ventral edge is represented as much smaller 

 than it is in reality. The body of the shell is large and ventricose, 

 and towards the posterior side, the lamellae of growth become ele- 

 vated, scaly, and arranged in radiating rows. The dark chocolate 

 brown of the exterior is relieved by narrow radiating whitish 

 streaks, and the posterior lobe is remarkably broad and large. 



1 Strictly following Lamarck, both this and Papilionacea belong 

 to Meleagrina, the separation of which genus however from Avi- 

 cula, seems repudiated by the best authorities. 



