. The fishes of North and Middle America [microform] : a descriptive catalogue of the species of fish-like vertebrates found in the waters of North America, north of the Isthmus of Panama. Fishes; Fishes; Poissons; Poissons. Jordan and Evcnnann.—Fishes of North America. 17 se liroail or briiiiratt), or y. Tylorir liaut coIoiH, r'o shores of J localized; tlm Uiiitod of Roiitlicrii lono Arctic,. aiiital. tical liiugc tide waler, All are irt) Tiearly 1 and anna- the fienera definition, iparisou ol' 18 of Sehas- tcrs of tlio !()n tribute III St The cliaraeteriHtic Hpines and rid^cH are: The preoci
. The fishes of North and Middle America [microform] : a descriptive catalogue of the species of fish-like vertebrates found in the waters of North America, north of the Isthmus of Panama. Fishes; Fishes; Poissons; Poissons. Jordan and Evcnnann.—Fishes of North America. 17 se liroail or briiiiratt), or y. Tylorir liaut coIoiH, r'o shores of J localized; tlm Uiiitod of Roiitlicrii lono Arctic,. aiiital. tical liiugc tide waler, All are irt) Tiearly 1 and anna- the fienera definition, iparisou ol' 18 of Sehas- tcrs of tlio !()n tribute III St The cliaraeteriHtic Hpines and rid^cH are: The preociilai' on the untrrior superior border of the orhit; the Hn|>raocular, near the ed);e of the frontal lione above the middle of the orliit; the poHtocular, li'diiiid tint Hiipraocn- iar, and the tynipanie, behind the poHtocular on the frontal bone near the superior poHterior anji;le of theoritit; ami the parietal, present in all the species, a longitndinal on th(^ nii<ldle of the parietal bone, of thcHe I idgoH all may be absent except the parietal, and in the <lil)er«-nt siterieH III which they are present differ excuiedingly iu the degree of their devel- opment. The thicknesM of the bones of the sknll is generally correlate*! with other characters, rather thin ))a])ery sknlls bearing strongly (h)Vel- ()p(!d bony ridges, while thicker an<l more bony skulls have the ridges low Iir obsolete. Hut therti are several exceptions to the rule. Other eharae- tfU'H at first seem important, but as they occur in a few sjiecieH only, far :ipart lu the series, they must be regarded as hporain», 2 ;)). These measurements give the all but invariable rule that, when 1 of the spines is absent the so-called supraocular occupiea the position of the jiostocular. When both the supraocular and postocular are present and * Hilgemlorf: UobiTsicht iilicr dio Japaniarhcii Si'ba&tes-Arten, SitzuiiM-Horicht, dor (lesellsi^liaft Naturf't>rsi'b«iuli'ii Fniiuulf zii Ucrlii
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Keywords: ., bookcentury1800, bookdecade1890, bookpublisher, booksubjectfishes
