. The Cambridge natural history. Zoology. FiG. 10.—Side view of axis of Dog. X |. 0, OiloiitoicI process ; ^s, posterior zygapopliysis ; s, spin- ous process ; f, transverse pro- cess ; V, vertebrarterial canal. (From Flower's Osteolor/i/.} Fig. 11.—Anterior surface of axis of Eed Deer, .x f. 0, Odon- toid process ; jjrs, posterior zygapopliysis ; sn, foramen for second spinal nerve. (From Flower's Osteolocjy.) bined mass. Indications of this have even been recorded in the human subject. The dorsal vertebrae vary greatly in number • nine {Hyper- ooclon) seems to be the lowest number existing n
. The Cambridge natural history. Zoology. FiG. 10.—Side view of axis of Dog. X |. 0, OiloiitoicI process ; ^s, posterior zygapopliysis ; s, spin- ous process ; f, transverse pro- cess ; V, vertebrarterial canal. (From Flower's Osteolor/i/.} Fig. 11.—Anterior surface of axis of Eed Deer, .x f. 0, Odon- toid process ; jjrs, posterior zygapopliysis ; sn, foramen for second spinal nerve. (From Flower's Osteolocjy.) bined mass. Indications of this have even been recorded in the human subject. The dorsal vertebrae vary greatly in number • nine {Hyper- ooclon) seems to be the lowest number existing normally ; while there may be as many as nineteen, as in Ceidetrs, or twenty-two, as in HijTdj:. These vertebrae are to be defined by the fact that they carry ribs, and the first one or two lumbars are often " converted into" dorsals by the appearance of a small super- numerary rib. The spinous processes of these vertebrae are commonly long, and sometimes very long. It is only among the Glyptodons that any of these vertebrae are fused together into a mass. The lumbar vertebrae, which follow the dorsal, vary greatly in number. There are as few as two in the whale Neolalaena, as many as seventeen in Tursiops; this group, the Cetacea, contains the extremes. Nine lumbars are found in the Lemurs Inclris and Loris. As a rule the number of lumbars is to some extent dependent upon that of the dorsals. It often happens that the number of thoraco-lumbar vertebrae is constant for a given group. Thus the Artiodactyles have nineteen of these vertebrae, and the Perissodactyles as a rule twenty-three. A greater number of dorsals implies a smaller number of lumbars, and of course vice versa. The existence of a sacral region formed of a. 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 Harmer, S. F. (Sidney Fre
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1895
