324 
confertis, transversalibus, decussantibus, ad latus posticum inter- 
ruptis, lineolis irregularibus, longitudinalibus, undulatis, inter- 
ruptis reticulatis. 
Hab. Red Sea. 
30. PsaMMosiA RUBICUNDA, Desh. P. testa pulcherrima, ovato- 
transversa, tenui, utroque latere paululum hiante, subequilaterali, 
tenue et regulariter oblique striata, striis confertis, acutiusculis, ad 
latus posticum valvule sinistre abrupte interruptis, latere postico 
late plicato, in valva dextra striis cum posticalibus continuis, non 
interruptis, vivide purpureo-rubente, maculis minimis, albis, irre- 
gulariter sparsis, radiisque angustis, violascentibus in latere postico 
divergentibus ; latere antico breviore, obtuso, postico paulo latiore, 
oblique truncato et obtuso; cardine angusto, nymphis brevibus, 
intus callosis, callo vivide purpureo ; valvis tenuibus, intus purpu- 
reis, albo nubeculatis. 
Var. B. Testa magis rubra, maculis albis, majoribus, minus nume- 
rosis. 
Hab. Philippines, Ticao. Coll. Cuming. 
31. PsammMosBria CorRUGATA, Desh. PP. testa ovato-transversa, 
convexiuscula, inequilaterali, rubro-violascente, albo irregulari- 
ter maculata et rubro-violaceo saturatiore subradiata, transversim 
oblique dense striata, in latere postico late et irregulariter rugosa, 
rugis cum striis continuis ; latere antico breviore, late rotundato, 
postico parum dilatato, superne recto; cardine bidentato, altero 
unidentato, nymphis violaceis ; sinu pallii profundo, obtuse tri- 
gono, superne declivi, basi dilatato. 
Var. B. Testa omnino candida. 
Hab. Philippines, Zebu. Coll. Cuming. 
32. PsAMMOBIA MARMOREA, Desh. P. testa ovato-transversa, 
compressiuscula, solidula, subequilaterali, transversim regulariter 
et oblique striata, striis acutiusculis, ad latus posticum inter- 
ruptis, sub epidermide tenui, albo-violascente, rubro-purpurascente 
Susco et albo marmorata, maculis albis, minimis, sepius trans- 
versis, maculis rubro-purpureis, elongatis, radiis interruptis 
simulantibus ; latere antico breviore, paulo angustiore, obtuso, 
postico subtruncato, obsolete oblique biflexo, plicis latis, depressis, 
subimbricatis notato ; cardine angusto, nymphis intus callosis, 
roseo-purpureis ; sinu pallii lato, profundo, obtuso. 
Var. 8. Testa latiore, pallidiore, inequaliter radiata. 
Hab. Darnley Island. 
Var. 3. New Holland (Sydney); Moluccas. 
33. Psammosia ABrRupta, Desh. P. testa elongato-angusta, 
transversa, tenui, pellucida, equilaterali, compressa, lutea, obso- 
lete rubescente pauci-maculata, transversim regulariter costu- 
lata, costulis obtusis, viz obliquis, postice abrupte interruptis ; 
latere postico compresso, costulis radiantibus, simplicibus, latis 
