. Notes on the North American ganoids [microform] : Amia, Lepidosteus, Acipenser, and Polyodon, with three plates. Ganoidei; Fishes; Ganoide; Poissons. "^-mrw- .•s^-,»%'^--'^' B. NATURAL HI8T0RT. 169 fS, ACIPENSER AND zoologists respect- is Ganoids, and its r Vertebrates. To Miiller, including, us, Polypterus and lyodon), Amia was djoin the Siluroids, jrill (12) considers ey) and Dipnoans" atodus) exhibit so ven entitled to sab- ers the Dipnoi as a he Selachians as a ) goes to the other only the sturgeons icognize the group imits and relations sales, to the dermal celeton in general,
. Notes on the North American ganoids [microform] : Amia, Lepidosteus, Acipenser, and Polyodon, with three plates. Ganoidei; Fishes; Ganoide; Poissons. "^-mrw- .•s^-,»%'^--'^' B. NATURAL HI8T0RT. 169 fS, ACIPENSER AND zoologists respect- is Ganoids, and its r Vertebrates. To Miiller, including, us, Polypterus and lyodon), Amia was djoin the Siluroids, jrill (12) considers ey) and Dipnoans" atodus) exhibit so ven entitled to sab- ers the Dipnoi as a he Selachians as a ) goes to the other only the sturgeons icognize the group imits and relations sales, to the dermal celeton in general, [ the multivalvular lolly unknown, and fore, not at present into the discussion Granoids differ from he Selachians and the brain is more comparisons have lose of other fishes ho alludes (12) to 9 of the brain and rs seem to be in other re- Aiture discoveries maj i heart in other classes of Vertebrates," does not refer to any other feature than the optic chiasma already mentioned. Having reasons,«« other than those derived from the extreme diversity of conclusions already referred to, for beUevmg th«^ a Treful study of their brains will throw light upon the limits and c a smcation of Ganoids, I have this summer (1875) made numer- ous preparations of the brains of the four American genera ^, . ZpLLs, Acipenser and Polyodon, ''^^'"'"iV V^^T^ other and with the figures and descriptions of Ganoid brains to which I have had access. Since, in comparison with the preparations, none of the pub- Ush^d figares and descriptions are wholly satisfactory, I here refer to them in detail. ., u • s= fi,of hw Apparently the earliest figure of a ganoid brain is that by Stfnn^us (32) of the sturgeon's brain. It seems to be a correct Representation, and fairly indicates the features which, according to the views I have reached, are characteristic of *he b-ns o^ ^ Ganoids. But no especial attention is drawn to them and the nomenclature of the two anterior pairs of lobes has
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Keywords: ., bookcentury1800, bookdecade1870, booksubjectfishes, bookyear1876
