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588 Clasis IV.
92. CLUPEA (Alosa) apice maxilla inferioris bifi-
do, maculis nigris. Arted.
CapPur 8c corpus compressa. Dorsum
subconvexum. Abdomen acutissimum. Capitis vertex
deprefsus; sulcus rhomboidalis inter oculos a basi
capitis ad frostrum extensus, parum ad latera
profundus, in medio elevatus. Striæ oblongæ,
utrinque ad basin fulci. :
Nares apertura una utrinque ptæditæ, rostto quam
oculis propiores. Rostrum obtusiusculum,
breve, sursum spectans. Rictus oris amplus.
Maxille æquales; superior minimum emarginata,
inferior parum acuta. Lingua apice acuminata,
marginibus deorsum flexis; Crista elevata per-
Östll
pendicularis ad basin linguæ. Denticulos nec
sensu attingere, nec oculo armato videre potui.
Puncta plurima, parva, nigricantia in maxilla
inferiore.
Oculi vertici quam gulæ, rostro quam fini operc.
br. propiores. sris argentea. Pupilla
nigrtescens.
Operc. Branch. laminis tribus constructa, quarum
duæ superiores semicirculares, apice
obtusissimaæ, altera quæ supröma latiore; altera vero
qua: media tenuiore. Infima linearis, reliquis
latior, ad latera utrinque obtusa, margine
inæqualis.
Membrana Branchiost. ossiculis 6. componitur,
imbricatis. Horum primum latissimum, subrectum,
apice lineare angulo inferiore interno, in
apicem acuminatum extenso. Secandum oblongum,
margine interno infraapicem excavatum, margine
externo rectum. Tertium rectum, oblongum, basi
lati-
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