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Boston Society of Natural History. 383 
Turacta pusescens, Leach. Mya declivis, Pennant, Maton and 
_Rackett, Wood, Dillwyn and Brown; a wi _Brown ; 
Mya pubescens, Pulteney, Montagu, and Tur Thracia pubes- 
cens, Blainville, Deshayes, Kiener ; Anatina ania, Lam. “Bainville 
It is believed that this shell has never been found on our coast; the 
shell which Mr. Conrad supposed to be identical with it, hese on fur- 
ther examination, to be a distinct species: 
Turacia convexa, Couthouy. Mya declivis, Donovan ; Mya con- 
vera, Wood, Turton; Anatina convera, Turton, (Brit. Biv.,) 
Brown; Ligula distorta? Montagu. 
THRAcIA corsuLoipes, Deshayes, Blainville, Lamarck, Kiener. 
The exterior surface of the valves is not smooth, as described by 
Deshayes, unless when the granular asperities have been accidentally 
effaced: 
Turacia piicata, Deshayes, Lamarck, Kiener. 
Turacia pHAsgoLina, Kiener; Amphidesma phaseolina, Lam. 
THRACIA SIMILIS, Couthouy. Th. testa ovato-oblonga, aspera, al- 
bida vel cinerea, subdiaphana, inequilaterali, latere postico lon- 
giore, truncato et subcompresso, angulo obtuso ab apice ad mar- 
ginem infero-posticam decurrente; cardine foveolé subtriangu- 
lari, valva utraque ligamento externé prominulo; intus alba, im- 
pressionibus muscularibus anticé elongatis, quasi clavatis, posticé 
rotundatis ; saree pallii posticé valdé excavata; an ossi- 
culum? Length 32, height 44, diameter ,% of an inch. Hab. 
Coast of Brazil, not far from Rio Janeiro, whence it was brought 
by a seaman, containing the animal, 
In general aspect and its surface it closely resémbles Th. corbuloi- 
des ; but it is destitute of the prominent ridge in the centre of the 
valves, it is much less inequivalve, and its ligamentary apophysis is 
much shorter, broader and more triangular, and its anterior muscular 
impression is simple instead of double, as in that species. In outline 
it approaches to Th. phaseolina, but is revise cosdiges by its rough sur- 
face and by its very marked striz of growt 
Turacia Conran, Couthouy. Th. testa “albicelnerartente: ovato- 
transversa, ventricosa, subequilaterali, fragili, paullum hiante, 
margine sinuato, anticé rotundata, posticé subtruncata, carina ob- 
tusa ab apice ad marginem infero-posticam decurrente, ligamento 
externé prominente, interné callo nymphale valva utraque inserto, 
Length 212, height 2,4,, diameter 1,8 inches. Inhabits probably 
the whole coast of New England. 
This shell was described and figured by Mr. Conran, in his “ Ameri- 
can Marine Conchology,” as 7's. declivis, under the supposition that it 
was identical with Mya declivis, Pennant; and besides mistaking ours 
