The ancient fauna of Nebraska: a description of remains of extinct mammalia and chelonia, from the Mauvaises Terres of Nebraska . diameter of second lower molar .Antero-posterior diameter of lower carnassial tooth luches. Lines . G 5 . 4 4J . 3 10 . 1 10 0 8 . 4 4 . 1 9 2 1 . 1 7 . 0 11 . 0 51 . 0 10 . 0 3 . 0 0 0 8i C H E L 0 N I A CHAPTER I. TESTUDO, Linnaeus. All the fossil turtles from Nebraska, which have come under my inspection,belong to the genus Testudo. In the ordinary constitution of Testudo, the osseous carapace is composed of tenvertebral plates, eight pairs of costal plates, and
The ancient fauna of Nebraska: a description of remains of extinct mammalia and chelonia, from the Mauvaises Terres of Nebraska . diameter of second lower molar .Antero-posterior diameter of lower carnassial tooth luches. Lines . G 5 . 4 4J . 3 10 . 1 10 0 8 . 4 4 . 1 9 2 1 . 1 7 . 0 11 . 0 51 . 0 10 . 0 3 . 0 0 0 8i C H E L 0 N I A CHAPTER I. TESTUDO, Linnaeus. All the fossil turtles from Nebraska, which have come under my inspection,belong to the genus Testudo. In the ordinary constitution of Testudo, the osseous carapace is composed of tenvertebral plates, eight pairs of costal plates, and eleven marginal plates upon eachside of a symmetrical nuchal and pygal plate. Fig. 1. 1ms, Fig. 1. Ideal view of the structure ofthe carapace of Testudo. The dark out-lines indicate the boundaries of the scutes;the serrated lines, the limits of the —lOvp (median line), vertebral plates;lep—Sep {i-ifjlit /(o)!f?), costal plates; Imp—limp, marginal plates; np, nuchal plate;PPi Pyg^l plate; Ivs—5vs, vertebral scutes;Ics—5 (Jt]ft), costal scutes; 1ms—11ms,marginal scutes; ns,nuchal scute; ps, py-gal The first vertebral plate is oblong quadrilateral; the succeeding plates, to the eighth inclusive, are most usually hexahedral; the penultimate plate is inverted V14 102 TESTUDO. shaped; and the last of the series is rhomboidal, and is included in the notch of thelatter and one similar of the pygal plate. The costal plates are alternately broader and narrower. In the recent condition, the carapace is invested by corneous scutes, which impressit with their form. There are five vertebral scutes, four pairs of costal scutes, and eleven marginalscutes upon each side of a narrow symmetrical nuchal scute and a broad undividedpygal scute. The plastron or sternum of Testudo is composed of a single, more or less i)yri-form, entosternal plate, inclosed by a pair of episternal and hyosternal plates, andposterior to the latter of a pair of hyposternal and xiphisternal
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Keywords: ., bookcentury1800, bookdecade1850, booksubjectpaleontology, bookyea
