A Treatise On Zoology volume 9

Cover A Treatise On Zoology volume 9
A Treatise On Zoology volume 9
E Ray Edwin Ray Lankester
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R, dermal rays ; l. P, lateral process ; scarcely any traCCS of it remain m. C, median process; p, pelvic cartilage; . -, f pr. R, postaxial radials ; pt. R, preaxial radials ; m any known lOSSllS. FeinCC, -S scaly covering of axial region. (Partly u thpP VISVP all InWp uft-6r Dciviuoff from Quart. UoiiTfi, MicT, oci. ) iiv/vvcvt/ij uiicoc iittvo tin luuduu fins like those of Ceratodus, there can be hardly any doubt, judging from the scale-covered axial region, the dermal rays, and what remains... of the axis in some fossils, that the endoskeleton in the extinct Dipnoi was of essen- tially similar character. It may safely be assumed that the early forms had typical rachiostichous and mesorachic paired fins.
FIG. 213.
BRAIN 245 The brain deserves particular notice : few organs in the Dipnoi so clearly show the isolation of this sub-class from other fish. On the whole, the brain is primitive in structure ; it lacks the special character- istics of the Elasmobranch or of the Teleo- stome ; so far as it is distinctly advanced, it approximates to the Amphibian type (Beauregard [35], Burckhardt [69], Bing and Burckhardt [73]).


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