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teralis utrinque unicus, transversus, trabalis, intus profande
emarginatus, extus rotundatus, postice extra medium spina
munitus. Uncini circ. 70; primi quatuor longe majores, lati et
difformes, hamo primi rotundato, secundi, tertii lanceolato, ad
flexuram emarginato 1. denticulato, quarti brevi triangulari;
reliqui subaequales hamo ovali, ad flexuram postice denticulato.
Emarginula crassa: dens medius laminaceus, planus, oblique
subquadratus, basi latior, acie laevi; laterales quatuor imbricati,
laminacei, oblongi, primo et secundo supra truncatis, tertio et
quarto apiculatis et extus crista longitudinali praeditis inflexa,
in secundo jam distinguenda. Uncini circ. 60; primus longe
major et crassior, hamo postice lobigero, scapo intus tuberculo
prominente, basi intus acute producto, extus condylo praedita,
cui respondet cavitas apicalis ossiculi minuti trapezoidea; uncini
reliqui subaequales hamo ovato-lanceolato serrulato.
PateUea. Membrana lingualis longissima; rbachis dente unico 1.
pluribus munita, e parte basali constitutis depressa pellucida et api-
cali hamata nigra; pleurae aut uncinis armatae, aut inermes.
*) Branchiae laterales ad marginem pallii. Rhachis
sex-den-tata, crista longitudinali angusta divisa, dente medio
impari nullo; pleurae uncinis tribus.
Patella vulgata: dentes utrinque tres, quorum bini aequales
lineares, basi elongata, plana, postice intus producta, in externa,
extus alata, longiore, apice in hamum unguicul8rem, simplicem,
carinatum, nigrum recte recurvato, et tertius, posterior, latior,
basi extus rotundato-productus, acie recurva obliqua,
divaricato-tridentata; uncini lineares, plani, brevissime hamati.
Patella pellucida: dentes utrinque tres, quorum bini fere aequales,
basi elongata, plana, medio articulata, postice intus
curvato-producta, interior gracilior, linearis, apice unguiculari, hamato,
exterior latiusculus, margine externo antice producto, apice
lato, subtriangulari, hamato, et tertius, posterior,
subrectangu-lus, acie munitus obliqua, plana, obtuse trifida; uncini tres
breviter hamati.
**) Branchia cervicalis. Rhachis 4- 1. 6-dentata, interstitio
medio nudo, angusto, quadras separante binas, quibus
dentes impositi; pleurae inermes.
Patella testudinalis: quadra angulo antico externo retuso-producta;
dentes bini, anteriore ad angulum internum hamo prxdito
longo gracili; posteriore fere transverso acie duplici, interna
longo majoro subtriangulari.
Pa tella virginea: quadra integra; dentes tres serie diagonali,
apicibus conicis.
***) Branchia
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