A treatise on zoology . Left-side view of head of Clarias lazera, C. and \., with branchial chamber exposed byremoval of operculum, a, accessory respiiatory organs attached to top of gill-arches ; an,anterior nostril; b, barbel; br, gill-lamellae ; pn, posterior nostril. 382 TELEOS TBI Bl.; Auchenoglanis, Gthr.—Africa. Pimelodm, Lac. ; Callophijsus, M. and. Fig. SCO. Left-side view of Saccohrcuichus fossilis, L., dissected to show the air-sac. 1, barbel; 2,pectoral, 3, pelvic, 4, dorsal, 5, anal, and 6, caudal tin ; 7, branchial sac; 8, its openinginto brancliial chamber.

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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology