AYE 
iq Cope. J 426 {March 1, 
: inthe present case they are somewhat flattened by pressure. They differ 
materially in size, one of them being twice the size of the others. The 4 
smaller ones are of the ball and socket type and have a deep longitudinal 
groove on each side. The thicker portion of the centrum forms the in- 
ferior boundary of this pit-groove, while a thinner portion, possibly a dia- 
pophysis limits it above. It is, however, thin, and had no great length. 
There is no sign of chevron bones and articulations, so that these verte- 
bree may have been cervical. Their bodies are, however, shorter and oy 
wider than in those vertebre of any known tortoise. A groove on the 
upper surface represents the neural canal ; while a flat portion on each side 
i in front, supports the neurapophyses. The large centrum exhibits the 
i superior groove, and antero-lateral platform for support of the neural 
arch. One end is eupped obliquely, while the other is nearly plane, with 
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the same obliquity and a slightly raised margin. Its outlixe is sub-tri- 
| angular. The lower side of this centrum possesses a short keel posteriorly. 
The sides exhibit no pit, but have a thin edge, which is concaye behind 
the middle, and then turn outwards. I can see no articulation for a rib. 
if The forms and characters of these vertebra resemble Sphargis more | 
i i g' | 
i than anything yet described. Hither the large or the small, or both must 1 
| be referred to the dorsal region ; in this case the concavity of one extrem- a} 
1 ? i 
ity is a new feature among tortoises, sofaras known. The great freedom 
of the arch from the centrum is very peculiar, while it is probable that the 
articulations of the ribs were to the middle of the side of the body, and 
| not to the adjacent parts of two bodies, and may have been (see below) 
to processes or diapophyses. 
M. | 
Length medium centrum....... wea laimioers NN ib viuas ORL | 
Width is ee dso On. iiwd. 0060 | 
Length between margins of zygapophyses do.......... 060 | 
Width “* anterior se N ; 070 
4 << posterior... i ae rani 087 4 
a “ anterior basis of arch...... ee EG 070 1 
i & voreh ab mMiddles... srsviewd. uoias ee Ni ee 028 : 
! Length ‘ rriehe Airiy lake sysree lee de oe ie 040 ‘I 
a Width posterior zygapophyses, No. 2..... asi ite tS babes .048 
" €C e1Of ACh, Hid ial lomonwtnws.. < onlerintemi de 025 
; deenoth, asiscadius Sie ulrhueocoe odineneeaena eedrore ia ag 025 
| i ofanterior foot (oblique)... ...66 ics. eqns eats UR, 
Length centrum,oflarge-0ne.iiiia.e cose erie ve hi ee 06 
Width i ec ef 
66 
neural canal ‘‘ 
Ten ribs were recovered. These are slender and rather flatter than in 
| most reptiles, but without the peculiar form, characteristic of tortoises 
and turtles. They are most expanded proximally, the bone spreading 
into a lamina, from the tubercular region, extending laterally and prox- 
