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Scalaria Turtonii: dens nullas; uncini unguiculares, latiusculi,
antico prodacti, simplices.
Heteropoda. Membrana lingualis postice sensim latior, plana;
rhachis unidentata; pleurae oncinis tribus planis, ad pressis, transversis,
curvatis, primo processum gerente, reliquis simplicibus, tertio breviore.
Carinari8 vitrea: dens latus, basi utrinque alato-productus, acie
tricuspide; uncini subaequales, processu primi spiniformi, curvato.
Atlanta Lesueurii?: dens parum latus, basi processu utrinque
recurvo auctus, acie tricuspide, media majore; uncini subaequales,
processu primi magno rotundato postice spina brevi aucto.
Atlanta Rangii: dens parum latus, basi utrinque
divaridato-produ-cta, acie unicuspide; uncini inaequales, primo maximo, lato,
postice spina ante apicem aucto, secundo et tertio brevibus curvis.
Turbinea. Rostrum breve, prominens, truncatum, non retractile,
ore terminali; ommatophori basi vibraculi adnati; margo pallii
simplex. Lamina lingualis valid8, gracilis, longa, linearis, ex parte in
cavitate viscerali recepta. Rhachis unidentata; pleurae uncinis tribus
oblique suberectis, margine superiore lobatis 1. dentatis, primo
crassiore, basi lato, producto.
Paludina vivipara: dens lsminaceus, longitudinalis, subovatus, acie
recurva, medio lobata, utrinque obtuse denticulata; uncini
subsimiles, laminacei, parum curvati, margine apicali utrinque
Jo-bato-denticulati, primo breviore, latiore, tertio margine
externo alato.
Melanopsis buccinoides: dens transversus, subquadratus, basi
media prominula, acie transversa, quinquecuspide; uncini validi,
primo crasso, intus processu brevi aucto, basi extus producta,
margine superiore inaequaliter lobato-dentato, secundo et tertio
gracilibus, subsimilibus, arcuatis, medio impressis et incrassatis,
apice recurvo tridentato.
Litorina litorea: dens validus subquadratus, supra convexus, acie
angusta, medio cordato-lobata, utrinque obtuse denticulata;
uncini subsimiles, crassi, apice inaequaliter dentato-lobati, primo
externe curvato-producto.
Lacuna canalis: dens fere hexagonus, acie 5-cuspide; uncino primo
postice, inter processus duos profunde emsrginato, margine
superiore 5- 1. 6-deotato, secundo gracili subclav8to,
quinque-dentato, tertio fere unguiculari, ante apicem margine anteriore
denticulato.
Rissoa membranacea: dens subquadratus, basi lata prominula,
processu laterali utrinque brevi, acie longe recurva apice late
lobata, utrinque inciao-déntata; uncini subtransversi, primo pro-
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