Fishes . nes re-duced in number. There are no jugular plates and no marginalteeth in the jaws. The tail is diphycercal in all, ending in along point, and the body is covered with cycloid scales. Tothese forms the name Sirenoidei was applied by JohannesMuller. Family Ceratodontidse. — The Ceratodontidce have the teethabove and below developed as triangular plates, set obliquelyeach with several cusps on the outer margin. Nearly all thespecies, representing the genera Ceratodus, Gosfordia, and Con-chnpoina, are now extinct, the single genus Neoceratodus stillexisting in Australian rivers. Ntmier
Fishes . nes re-duced in number. There are no jugular plates and no marginalteeth in the jaws. The tail is diphycercal in all, ending in along point, and the body is covered with cycloid scales. Tothese forms the name Sirenoidei was applied by JohannesMuller. Family Ceratodontidse. — The Ceratodontidce have the teethabove and below developed as triangular plates, set obliquelyeach with several cusps on the outer margin. Nearly all thespecies, representing the genera Ceratodus, Gosfordia, and Con-chnpoina, are now extinct, the single genus Neoceratodus stillexisting in Australian rivers. Ntmierous fragments of Cera-todus are fotmd in Mesozoic rocks in Europe, Colorado, and 240 Subclass Dipneusti, or Lung-fishes India, Ceraiodus latissimus, figuredby Agassiz in 1838, being the best-known species. The abundance of the fossil teethof Ceratodns renders the discovery ofa Hving representative of the sametype a matter of great interest. In 1870 the Barramunda of therivers of Queensland was described. Fig. 172.—TVeth of Ceraiodus runcinatus Plio-ninger. Carboniferous. (After Zittel.) by Krefft, who recognized its rela-tionship to Ceratodns and gave it thename of Ceratodns forsteri. Later,generic differences were noticed, andit was separated as a distinct groupby Castelnau in 1876, under the nameof Neoceratodns (later called Epicera-todus by Teller). Neoceratodns forsteriand a second species, iVeoceraiot/;<5 niio-lepis, have been since very fully dis-cussed by Dr. Giinther and Dr. Krefft. M.
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