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***) Branchia externa nulla (?). Rhachis integra dente medio
solitario quadra suffulto clypeata; pleurae uncinis duobus.

Patella casca: quadra subquadraia, antice rotundato-alata, dens basi
late cordata, acie triloba, lobo medio longiore subspatulato,
laterali breviore reniformi; uncini utrinque duo, laminacei,
breviter hamati, interno extus alato, postice in stylum producto.

Patella fulva: quadra elongata, antice utrinque angulato-alata; dens
basi elongata, acie integra, valida, sagittata, cuspide media
robusta cum basali utrinque minuta, divaricata; uncini elongati
hamati, hamo longo, lanceolato, margine externe ciliato.

Cktoone*. Membrana lingualis longa linearis. Rhachis dentibus
pluribus, medio impari, laterali utrinque externo maximo, hamo
nigro, opaco; uncini pleurae plures in lamellas coarticulatas inermes
efformati, unico erecto hamato.

Cbiton cinereus: dens medius elongatus, e basi ovali in collum
gracile exsertus, acie transversa, latiore, sublevi, supra
convexa; lateralis primus nonnihil major leviter hamatus, ala magna
rotundata utrinque praeditus, in cavitate dorsali basem excipiens
productam dentis secundi maximi, scapo crasso, extus
emarginato, hamo ad flexuram antice apina aucto, nigro, opaco;
uncini deformes quini, trapesoidei, oblique aeriati, sexto inter
secundum et tertium erecto, hamato, leviter arcuato, margine
superiore reflexo, inciso.

Chiton laevis: dena medius linearia, medio parum angustior, acie
transversa, sublaevi, supra convexa; lateralis primus vix major,
late unguicularis, aversus, secundus maximus scapo subclavato,
extus cavato, bamo minuto, lato, tridentato; uncini deformes
quini, trapezoidei, aexto inter secundum et tertium erecto,
8ubtriangulari, margine auperiore late reflexo, striolato.

DenlaHna. Membrana lingualis lata, ovata. Rhachis unidentata;
pleurae uncino solitario; limbus laminatus.

Dentalium entalis: dens unicus, sub-semicircularis, obliquus,
planus, basi subrecta, margine sinuoso, acie inermi; uncinus
unicus scapo compresso angulari, hamo angulo obtuso inflexo,
margine apicali antice denticulato; limbus lamina magna
curvato-rhomboidea, elongata.

Öfver*, nf ttongi. r*.-Akad. fiork. Arg. 4. M-e *

4

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