. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. FK FIG. 27.—PORTION OF THE :I:AL COLUMN OF A YOUNG DOGFISH caniculn). (After Cartier.) Q notochord ; Kn, outer, and A"//1, inner, zone of cartilage ; FK, the filim-enrti- lugiimus muss lying between these zones, which is undergoing calcification; Li, intorvcrtrliral ligament. by the tail-fin, which is therefore spoken of as protocercal or diphycercal (see Fig. 29). This condition is met with also in ninny Fishes of the Devonian strata, as well as in young stages of Teleostei. In the
. Elements of the comparative anatomy of vertebrates. Anatomy, Comparative; Vertebrates -- Anatomy. FK FIG. 27.—PORTION OF THE :I:AL COLUMN OF A YOUNG DOGFISH caniculn). (After Cartier.) Q notochord ; Kn, outer, and A"//1, inner, zone of cartilage ; FK, the filim-enrti- lugiimus muss lying between these zones, which is undergoing calcification; Li, intorvcrtrliral ligament. by the tail-fin, which is therefore spoken of as protocercal or diphycercal (see Fig. 29). This condition is met with also in ninny Fishes of the Devonian strata, as well as in young stages of Teleostei. In the latter, however, the ventral half of the tail-fin with its supporting skeleton becomes, as a result of unequal growth,. KM:. " --I' UK Tlir. V I i: I I I'.i: \ I. COLUMN OF ScyiMVUA, ll'/\, ••• ; 1 1/'. upper arches ; /••, int. ivalary pi^-cs. The apertures fyr the spinal , ;uv sin ii in the arches and intercalary pieces. more developed tli;m the dorsal, and thus the vertebral rcliimn is limt ii]> dorsally, giving rise to a heterocercal tail. Tins I'.M-III ..(' lull maybe rccogniseti , as in many Eliismo- branchs, C:ui.)ids. ;md numerous fossil Fishes, or may be masked by ;, moreor less symmetric! tail-tin, \vln-ii it is only visible internally rL«;^ l''u. :in and Amia to some extent, but more particu- larly in Teleosteans,3 <•.;/. Salmo, Esox). i Tli.' lii ..... :ercal |A sometimes nsei the masked hotorocercaJ nf tin- n. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Wiedersheim, Robert, 1848-1923; Parker, W. N. (William Newton), d. 1923. London, New York, Macmillan
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Keywords: ., bookcentury1800, bookdecade1880, bookpublisherlondonnewyorkmacmi
