64 
9. Mactra 1nconGRuA, Desh. M. testa ovato-trigona, obliqua, 
inequilaterali, turgida, cordiformi, subepidermide squalide fla- 
vescente alba, levigata, transversim substriata, latere antico 
breviore, declivi, rectilineari, obtuso, postico convexiusculo, sub- 
angulato ; umbonibus tumidis, acutis, parum obliquis ; lunula 
ovata, planulata, areaque posticali in medio carinulata, tenuiter 
plicatis ; cardine angusto, fossula brevi, angusta, obliqua, den- 
tibus lateralibus compressis, subequalibus, antico paulo breviore; 
impressione pallii lata; sinu brevi, obliquo, lato. 
Hab. Luzon, Philippines. Coll. Cuming. 
10. Macrra 1InzqQua tis, Desh. M. testa ovato-transversa, sub- 
trigona, inequilaterali, compressiuscula, ad marginem inferio- 
rem acutiuscula, polita, nitente, epidermide nitide flavescente 
vestita ; latere antico longiore, parum attenuato, obtuso, postico 
angulato ; lunula areaque posticali tenuiter plicatis ; umboni- 
bus brevibus, acutis, oppositis; cardine angustissimo ; fossula 
cardinali brevi, angusta, obliqua; dentibus lateralibus com- 
pressis, brevibus, in altera valvula duplicatis ; valvis intus albo- 
pallide flaveis ; sinu pallii angusto, profundo, horizontal. 
Hab. China. Coll. Cuming. 
11. Macrra intTuspicta, Desh. M. testa oblique trigona, te- 
nui, turgida, inequilaterali, transversim obsolete inequaliter 
striata, sub epidermide pallide flavescente fusco-grisea, ad um- 
bones cerulescente aliquantisper obscure radiata, intus vivide 
rubro-violacea, radiis pallidioribus, albicantibus picta; latere 
antico declivi, superne rectilineari, obtuso, postico convexiusculo, 
inferne obtuse angulato ; lunula plana areaque ovatis, subequa- 
libus, tenue plicatis ; cardine angusto, dentibus lateralibus com- 
pressis, valde prominentibus ; linea pallii margine inferiore 
proxima, sinu brevi, oblique ascendente. 
Hab. Manilla; China. Coll. Cuming. 
12. Macrra Luzonica, Desh. WM. testa transversim trigona, 
equilaterali, subsymmetrica, turgidula, equaliter utroque latere 
declivi, nitida, pallide fusca vel albo rufescente, in latere postico 
castanea, extremitatibus equaliter obtusis; umbonibus minimis, 
acutis, apice violaceis ; lunula areaque equalibus, regulariter 
plicatis, violaceo-maculatis ; valvis antice inferneque sulcatis, 
sulcis irregulariter evanescentibus, intus rubro-violaceis ; car- 
dine angusto, fossula angusta, obliqua ; dentibus lateralibus 
lamellosis, equalibus, prominentibus ; sinu pallit angusto, pro- 
Sundiusculo. 
Hab. Luzon, Philippines. 
13. Macrra Murcuisoni, Desh. M. testa ovato-transversa, 
convexa, solida, subequilaterali, clausa, albo-grisea, subepider- 
mide pallide straminea, decidua, inequaliter substriata, latere 
antico paulo breviore, obtuso, superne declivi, postico subangu- 
lato, extremitate parumper acuminato ; margine inferiore regu- 
