63 
ceis ; latere antico et postico equaliter declivibus, antico bre- 
viore, obtuso, postico attenuato, acuminato, margine inferiore in 
medio valde convexo; lunula planulata, tenue et regulariter 
striata; area angulo obtuso circumscripta, tenue striata; car- 
dine angusto, fossula minima ; dentibus lateralibus crassius- 
eulis, brevibus, equalibus, prominentibus; sinu pallit brevissimo, 
via inflexo; valvis intus profunde violaceis. 
Hab. Ceylon. Coll. Cuming. 
5. Macrra corsuLorpeEs, Desh. M. testa M. donaciformi simil- 
lima sed multo minore, equilatera, turgidula, satis solida, alba, 
laevigata; latere antico obtuso, postico acuminato, angulo de- 
currente acutiusculo notato; area magna, subplana, levigata ; 
lunula elongato-lanceolata, angulo obsoletissimo circumscripta; 
cardine solido, fossula minima angusta, recta, dentibus latera- 
libus brevibus, tenue perpendiculariter sulcatis; sinu pallii bre- 
vissimo, lato, fere semicirculari. 
Hab. 2 Coll. Cuming. 
6. Macrra pecora, Desh. WM. testa ovato-transversa, turgida, 
inequilaterali, nitida, ex albo et violaceo eleganter radiata et 
transversim zonata ; latere antico paulo breviore, obtuso, trans- 
versim tenue et regulariter sulcato, sulcis in medio evanescen- 
tibus; umbonibus tumidulis, atro-violaceis, parum distantibus ; 
lunula bicolorata, albo et violaceo regulariter plicata; area 
concaviuscula, tenue plicata. 
Hah. ? Coll. Cuming. 
7. Mactra pisstm1uis, Desh. M. testa transversa, ovato-tri- 
gona, nequilaterali, turgidula, nitida, alho-grisea, ad margines 
rufescente, aliquantisper zonulis transversis, cerulescentibus in- 
terrupta, intus rubro-violacea; latere antico paulo breviore, 
obtuso, superne recto, declivi, latere postico superne convexius- 
culo, eatremitate obtuso; umbonibus brevibus, acutis, postice ob- 
tuse angulatis ; lunula areaque distinctis, eleganter sulcatis ; 
valvis regulariter transversim tenue sulcatis, suleis inferne con- 
tinuis, superne ad umbones et latus posticum evanescentibus. 
Hab. Australia (Jukes). Coll. Cuming. 
8. Macrra wepatica, Desh. WM. testa transversa, oblique tri- 
gona, inequilaterah, turgidissima, levigata, nitida, antice solum 
modo brevi-striata, intus extusque colore hepatica infucata ; 
umbonibus tumidis, apice acutis, nigro-violaceis, distantibus ; 
latere antico breviore, obtuso, superne recto vel concaviusculo, 
postico obtuse angulato ; lunula areaque depressis, ovatis, sub- 
equalibus, tenuiter striatis; cardine angustissimo, fossula parva, 
obliqua, dente V-formi duabus partibus valde inequalibus com- 
posita, dentibus lateralibus brevibus, angustissimis, antico multo 
minore; linea pallii margine inferiore proxima; sinu pallii 
brevi, oblique semicirculari. 
Hab. Philippines. Coll. Cuming. 
