. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 66 ANATOMY OF VERTEBRATES. 54 more downward, so as to form the body of the rib, which termi- nates, however, in a free point. In the ninth cervical, the rib, i, is increased in length, but is still what would be termed a ' false' or ' floating ril) ' in anthropotomy. In the succeeding vertebra the pleurapojihysis, fig. 54, /.•, articulates with a hjcmapophysis, and the haemal arch is completed by a hajmal spine; by which completion of the typical segment we distinguish tlie commencement of the series of dorsal vertebri-c
. On the anatomy of vertebrates. Vertebrates; Anatomy, Comparative; 1866. 66 ANATOMY OF VERTEBRATES. 54 more downward, so as to form the body of the rib, which termi- nates, however, in a free point. In the ninth cervical, the rib, i, is increased in length, but is still what would be termed a ' false' or ' floating ril) ' in anthropotomy. In the succeeding vertebra the pleurapojihysis, fig. 54, /.•, articulates with a hjcmapophysis, and the haemal arch is completed by a hajmal spine; by which completion of the typical segment we distinguish tlie commencement of the series of dorsal vertebri-c. With regard to the so-called ' 2:)erforation of the transverse process' this equally exists in the pre- sent vertebra, as in the cervicals ; on the other hand, the cervical vcrtebraj equally show surfaces for the articu- latidu of ribs. The typical characters of the segment, due to the completion of both neural and liannal arclies, are continued in some species of Crocodilia to tlic sixteenth, in some {Crocodilus acutns) to the eighteenth vertebra. In the Crocodilus acutus and the Alligator luciiis the hremapophysis of the eighth dorsal rib (seventeenth segment from the head) joins that of the antecedent vertebra. The jdeurapophyses ]iroject freely outward, and become * floating riljs' in the eighteenth, fig. 55, h, nineteenth, ib. c, and twentieth, ib. d, vertebra\, in which tliey liecome rapidly shorter, and in the last appear as mere appendages to the end of the long and broad diapophyses: but the hwmapo- ])hyscs by no means disappear after the solution of their union with their ])leuraj)ophyscs; tliey are essentially independent elements of the segment, and are according!v con- tiniied, in ])airs, fig. 55, 3, 4, 5, f,, 7, and 56, along the ventral sur- face of tlie abdomen of the Croeodilin, as far as their modified liomoty])es the l)oncs,ib. 8. Tliey are more or less ossified, and are generally divided inio two en- three iiieces. A sboi't carti- laginous piece,
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Keywords: ., bookauthorowenrichard18041892, bookcentury1800, bookdecade1860
