A treatise on zoology . 0^Tp^t^. Fig. 375. Upper and lower side of the liead of Aneistrus {Chactostomus) hetemcanthus, Gthr. UpperAmazons. (After ) Tufts of enlarged dentmles nrp slmwn at f>,» =,vio» 25 j86 TELEOSTEI Group B. The lower members of this group preserve many primitivecharacters, such as the median gular, mesocoracoid arch, spiral valve,conus Avith two rows of valves, all of which are found in the firstsub-order only; moreover, the oviducts may have open internalfunnels (p. 367). There is an interorbital septum, not alwayscompletely formed, however (Osteoglossidae, Gala
A treatise on zoology . 0^Tp^t^. Fig. 375. Upper and lower side of the liead of Aneistrus {Chactostomus) hetemcanthus, Gthr. UpperAmazons. (After ) Tufts of enlarged dentmles nrp slmwn at f>,» =,vio» 25 j86 TELEOSTEI Group B. The lower members of this group preserve many primitivecharacters, such as the median gular, mesocoracoid arch, spiral valve,conus Avith two rows of valves, all of which are found in the firstsub-order only; moreover, the oviducts may have open internalfunnels (p. 367). There is an interorbital septum, not alwayscompletely formed, however (Osteoglossidae, Galaxiidae, Gadidae).With the single exception of the Gadiformes (p. 478), these fishhaAe the cranial cavity shortened, the brain situated far back, theolfactory lobes lying immediately in front of the fore-brain, and theelongated olfactory nerves passing forward on either side of theinterorbital septum when present (p. 324). There are neitherdenticles nor Weberian ossicles. The lines of divergence amongthe lower forms are too ind
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Keywords: ., bookcentury1900, bookdecade1900, bookpublishe, booksubjectzoology
