339 
dine lato, crasso, fossula angusta, profunda; dentibus late- 
ralibus crassis, subequalibus, prominentibus, acuminatis ; sinu 
pallii parvulo, angusto, brevi, oblique semicirculari. 
Hab. ? Coll, Cuming. 
100. Mresoprsma macropon, Desh. WM. testa minima, trigona, 
subiransversa, inequilaterali, depressa, in medio convewiuscula, 
squalide albo-flavescente, transversim sulcata, sulcis irregularibus, 
approximatis, convexis, antice attenuatis, postice paulo eminentio- 
ribus ; latere antico longiore, obtuso, superne declivi, postico ob- 
tuso, brevi, declivi; umbonibus minimis, acutis, brevibus ; cardine 
lato, crasso ; fossula sulciformi, profunda; dentibus lateralibus 
validis, subequalibus, in utraque valva prominentibus ; sinu pallii 
brevissimo, minimo, oblique subsemicirculari. 
Hab. ? Coll. Cuming. 
101. Mrsopesma Layarpt, Desh. WM. testa trigona, crassa, tur- 
gida, inequilaterali, ad umbones pallide violacea, zonulis angustis 
aliquibus saturatioribus, valvis intus nitide pallideque violaceis, 
transversim obsolete striato-rugata, postice irregulariter plicata ; 
latere antico paulo longiore, superne convexiusculo, declivi, inferne 
convexo, extremitate obtuso; latere postico obtuso, depresso, sub- 
plano, recto, valde declivi, inferne subangulato ; cardine lato et 
crasso, dentibus, precipue anticis, prominentibus, compressis, fos- 
sula angusta, profunda ; sinu pallii minimo, angusto, obtuse trian- 
gulari. 
Hab. Ceylon. 
102. Mesoprsma itis, Desh. WM. testa ovato-trigona, trans- 
versa, turgidula, crassa, solida, subequilaterali, transversim ob- 
solete et inequaliter striata, nitida ; latere antico paulo longiore 
posticoque rectis, declivibus, equaliter obtusis, margine inferiore 
regulariter convexo; cardine crasso, fossula profunda, basi non 
prominente, dentibus validis, postico value dextre majore, valde 
prominente, trigono, compressiusculo ; sinu pallit minimo, brevis- 
simo, trigono, apice acuto. 
Hab. Australia. Coll. Cuming. 
103. MesopesmMa succata, Desh. WM. testa trigona, subtrans- 
versa, subequilaterali, crassa, solida, in medio convewxiuscula, 
apice acuminata, squalide albo-flavicante, transversim regulariter 
‘sulcata, sulcis latis, convexis, depressis, approximatis, ad apicem 
evanescentibus, postice alternatim interruptis ; latere antico obtuso, 
atque postico cqualiter rectis et declivibus, margine inferiore 
parum convexo ; latere postico parum convexo, sulcis minus regu- 
laribus ; cardine crasso, fossula angusta, profunda ; dentibus late- 
ralibus crassis, postico maximo, triangulari, valde prominente ; 
sinu pallii satis lato, brevissimo, ovato-triangulari. 
Hab. ? Coll. Cuming. 
104. Herrrocarpia Cuminei, Desh. A, testa ovato-trans- 
