69 
nima, basi parum prominente, dentibus lateralibus vix perspr- 
cuis ; sinu pallii profundo, horizontali, obtuso. 
Hab. Japan. Coll. Cuming. 
31. Macrra puicatiuis, Desh. M. testa transversa, oblonga, 
ovata, angusta, inequilaterali, compressiuscula, tenui, fragili, 
hyalina, transversim plicata, plicis prominentibus, elevatis, regu- 
laribus, antice parum obliquis ; latere antico paulo breviore, 
rotundato, postico hiante, paululum angustiore, oblique cari- 
nato; area angustissima, plana, levigata, angulo obtuso circum- 
data, lunula inconspicua; cardine angusto; dente cardinalt 
satis magno, lateralibus lamellosis, brevibus, prominentibus, tri- 
angularibus, acutis ; sinu pallii profundo, lato, subtrigono, apice 
obtuso. 
Hab. ——? Coll. Cuming. 
32. Macrra rostrRAuis, Desh. WM. testa ovato-transversa tur- 
gida, tenui, hyalino-vitrea, inequilaterali, transversim plicata, 
plicis regularibus, antice prominentioribus, transversim tenuis- 
sime striatis ; latere antico paulo longiore, late obtuso, postico 
declivi, hiante, attenuato, subrostrato; cardine angustissimo, 
dente cardinali compresso, fossula minima, dentibus lateralibus 
brevissimis, angustis, cardine approximatis ; lunula impressa, 
plana, ovata. 
Hab. Japan. Coll. Cuming. 
33. Macrra siticuna, Desh. WM. testa ovato-transversa, com- 
pressiuscula, subequilaterali, postice hiante, candidissima, epi- 
dermide pallide flavicante, sericea vestita; latere antico obtuso, 
superne concaviusculo, postico superne convexiusculo, extremi- 
tate parumper attenuato ; area posticali angusta, in medio 
concaviuscula, epidermide fuscescente, irregulariter plicata in- 
duta, linea elevata circumscripta ; lunula inconspicua; valvis 
extus argutissime transversim striatis ; umbonibus parvis, pa- 
rum obliquis, politis ; cardine in medio lato, fossula magna, 
dentibus lateralibus parvis, brevibus, lamellosis, acutis. 
Hab. Luzon, Philippines. Coll. Cuming. 
34. Macrra cCApILuAceA, Desh. M. testa transversa, ovato- 
cuneiformi, valde inequilaterali, tenui, candida, sub epidermide 
tenui, decidua, straminea, lineis capillaceis, longitudinalibus, 
parum prominentibus, numerosis, approximatis, irregularibus, 
inter se confluentibus, sepe interruptis reticulatim intricatis ; 
latere antico brevissimo, obtusissimo, semicirculari, postico sen- 
sim attenuato, hiante, superne declivi, rectilineo; cardine angus- 
tissimo, dente cardinali magno, fossula angusta, postice obli- 
quata; dentibus lateralibus parvulis, postico longiore; sinu 
pallii profundissimo, lato, marginibus fere parallelis. 
Hab. Philippines; mouth of the Indus. Coll. Cuming. 
35. Macrra tristis, Desh. M. testa ovata, transversa, com- 
pressa, tenui, inequilaterali, utroque latere hiante, epidermide 
