197 



ingle surface with the back p*rt of the (pine in advance, and by a corresponding posterior 

 turface with that which follows : its tummit articulates with the ninth neural plate of thr 

 carapace. The pleurapophyses of thi* vertebra are short, compressed, and expanded at their 

 dutal ends, which are confluent with the antecedent plcurapophyse* and present a broad 

 rough irregular surface for the attachment of the ilium. The neural spine of the last ver- 

 tebra of the carapace is not directly continued into the ninth median or neural plate, but ter- 

 minates superiorly in two articular facet*, one joining that plate and the other the plate in 

 advaac*. 



Pretexted by Prof. Owen, F.R.S. 



1015. A neural spine, with the connate expanded horizontal bony plate, and tin- 

 led plcurapophysis, connate with the costal plate of the carapace, of the 

 same Tortoise : the long compressed neck of the rib is excavated ante- 

 riorly. Presented by Prof. Owen, F.R.S. 



1016. The left humcrus of the some Tortoise (Tentudo eiepkantopu*), longitudinally 

 bisected, to show the absence of a medullary cavity : its place is occupied by 

 a coarse canccllous texture. Presented by Prof. Oven, F.R.S. 



1017. The left femur of the same Tortoise in longitudinal section, showing a similar 

 structure. Presented by Prof. Owen, F.R.S. 



1016. The osseous thoracic-abdominal box or shell of a young Elephant Tor- 

 toise (Tettudo eli-phantopux), from which the horny scutes have been re- 

 moved. 



The median pieces of the carapace are numbered from . I to . 1 2, consecutively, and of 

 these the second to the ninth inclusive are connate with the summits of the spines of the cor- 

 responding dorsal vertebrae. The lateral plates of the carapace are numbered from pi. 2 to 

 pi. 9, consecutively, being connate with the pleurapophysial elements or vertebral ribs of the 

 second to the ninth dorsal vertebrae inclusive. The short ribs of the first dorsal vertebra 

 may be seen in the interior of the box articulated by their expanded distal extremities to thr 

 second pair of ribs. The marginal pieces are numbered from . 1 to m. 1 1, consecutively, on 

 each side. The pieces of the plastron have their special names written upon them. The 

 necks or proximal free portions of the expanded ribs are unusually long and slender in Tor- 

 toises with lofty carapaces of the present form. The neural spines are extremely thin and 

 deep plates, their antero-posterior extent much exceeding that of the neurapophyses support- 



