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ducto, margine ante lobum validum pectinato-dentato, secundo
et tertio fere unguicularibus, illo serrato, bocantioe serrulato.
Assi minea grayana: dens infra latior, basi media truncata,
prominente, utrinque cornuto-produota, acie triangulari 5—7-cuspide;
uncinus primus 7-dentatus, dente tertio majore, secundus
gracilis, scapo angusto, unguicularis, extus serratus, tertius apice
rotundatus ciliato-denticulatus.
Valvata piscinalis: dens subquadratus, basi utrinque producto,
incurvo, acie triangulari, cuspide media cum lobo utrinque pectinato;
uncini subsimiles, laminacei, utrinque dentati, denticulo
api-cali majore.
Naticta. Rostrum longum* recondendum; vibracula membrana
transversa connata, ommatopbori eorum basi externe immersi;
mentum maximum, reclinatum; lobus operculigerus amplissimus; pallii
margo simplex. Membrana lingualis brevis, linearis. Rbacbis
uni-dentata. Pleure uncinis tribus.
Natica pulchella: dens validus basi latus, processu laterali utrioque
brevi, crasso, acie longe recurva tricuspide, media majore;
uncinus primus apice porrectus recurvus, cuspide media majore,
externa minore et denticulis intus minutis, secundus et tertius
breves, simplices, unguiculares.
Cypraracea. Rostrum breve prominens, non recondendum, ore
inferiore; ommatophori basi vibraculi, saepe ad dimidium fere,
ad-nati; pallium margine dilatatum, testam externe amplectens; sipho
brevis. Membrana lingualis longa, linearis, ex parte in cavitate
vjscerali recepta. Rhachis unidentata. Pleurae uncinis tribus.
Cypraea helvola: dens minutus, basi latior, acie lobo medio magno,
et laterali utrinque minore; uncini subsimiles, primo minore,
longe hamati, cum dente externo ad flexuram et denticulo
sub-apicali interno.
Cypraea europaea: dens longior quam latus, acie subtriangulari
utrinque denticulata, cuspide media; uncini dissimiles: primo apice
longe mucronato utrinque denticulato, secundo et tertio
simplicibus, unguicularibus.
LameUariacea. Rostrum longum, recondendum, ommatopbori basi
vibraculi adnati; margo pallii amplus testam amplectens, non
re-tractilis. Membrana lingualis linearis, valida, armatura mire
diversa. Rhachis unidentata. Pleurae aut uncinis tribus subsimilibus,
fere longitudinalibus, aut unico, maximo.
La mei lar ia prodita: dens elevatus, parte superiore rotundata,
la-tiore, acie transversa unicuspide, utrinque denticulata; uncini
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