TRIBE MALLEACEA. 263 
A. Savienu. Desh m Lam. vol. 7. p. 102.—E. t, 2. p. 100.— 
A, Heterorrera. Sow. G.f. 1.—Reeve t. 109.—Ch. f. 2018,9.? 
Thin, fragile, blackish brown, oblique, with transverse very fine 
striz, which become rather scaly on one side: tail short, scarcely 
longer than the wing. 
A. Brevicaupa. Desh. 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.—d link 
between this genus and Meleagrina. 
A. Georcina. 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. Livipa. Desh. 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. ! 
A. Lineutata. Desh, 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. Ata-corvi—Mytitus A. Chemnitz. vol. 8. p. 144. f 
727.—D. 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. Nesutosa. Conr. Journ. Philad. 7. p. 246. Convex, ra- 

given a copy, (W. t. 12. f. 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 lamelle 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. 
