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382 Clasis IV.
90. ATHERINA Hepsetus.
Capur gk corpus compressa; Caput superius
plagioplateo-angulatum. Dorsum convexum,
crassum, rectum, æquale. Abdomen paulo angustius,
infra anum parum declive. Latera
perpendicularia.
Maxilla superior protractilis, ossic. 6, quorum pri-
mum, marginem constituens, tenuissimum,
ellipticum; duo alia, unum utrinque, huic
inferius ad angulum acutum conjuncta, superius
apici oris annexa membrana tenuissima dilatabili;
inter hæc öt os marginis alia; inter illa å&
maxillam infer. ossicula 2, superius maxillam
superiorem & apicem oris unientia. Maxilla inferior
antice crassa, postice lata, 2, unum utrinque.
Os valde sursum elevatur, Gula declivis. Rostrum
obtusum. Rictus amplus. Denticulorum, in
quavis maxilla, linea una, qui minutissimi scabri.
Oculi magni, ad latera capitis, a rostro quam operc.
br. paulo remotiores, proxime infra verticem
capitis. Iris argentea. Pupilla nigra. Anguli,
in verticem capitis, duo, longitudinales, alter
versus rostrum, qui ex ossiculis (vid. max. sup.)
åc rostrum unientibus oritur, alter ad basin
capitis. Fovea transversalis inter utrumque
angulum, proxime supra oculorum medium.
Operc. Branch. lamina 1:ma triangularis, apice
obtusa; 2:da rotundato-angulata, angulo
obtusiusculo in medio. Squamis tota opercula teguntur.
Membrana Branch. ossicula 6 habet, quorum
extimum brevissimum, tenuissimum; reliqua
ordine longiora; intimum basi latissimum. Branchiæ
4, tenues. Tuberculorum in superficie
concava lineæ duæ, quæ brevifsimæ acuminatæ sub-
aspe-
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