LAND-TOETOISES AND AN EXTINCT LIZAED FEOM MAUEITIUS. 315 



The Carapaces. (Plate XLII.) 



Carapace No. I. — Testudo sauzieri. The whole shell, together with the plastron, is 

 complete, with the exception of the second, third, and fourth vertebral plates. The 

 dorsal profile differs from that of the typical T. inejita by the shape of the hump of 

 the fifth vertebral plate, the much steeper hump of the fourth plate, and the appa- 

 rently much steeper hump of the first vertebral. 



The marginals are likewise different ; the first is in broad contact with the first 

 costal, even more so than in T. triserrata, while in T. inepta the first marginal and 

 first costal do not touch each other. The last marginal or caudal is much thicker than 

 in T. inepta, measuring 10 by 3'3 cm., with a thickness of 2"3 cm. ; instead of being 

 concave ventrally, it is decidedly convex. 



The total length of carapace no. I. is 51'5 cm. ; its greatest breadth across the 

 inguinal region is 36 cm. 



The plastron, 36 cm. long, resembles that of T. triserrata (that of T. inepta is still 

 unknown), but the pectorals are wider than in the plastron figured by Dr. Giinther, 

 while the markings of the shields in the axillary region agree with it. However, there 

 is another male plastron in the Cambridge Museum, determined by Dr. Giinther as 

 belonging to T. triserrata, in which the pectorals are just as wide as in T. sauzieri, 

 while the axillary impressions are different. 



The whole shell is rather thick, like that of T. inepta ; the sides are steep and as 

 decidedly convex as in T. inepta. 



Carapace No. II. — T. inepta. Fragment of posterior two-thirds, typical T. inepta. 



Carapace No. III. — T. triserrata. Fragment, consisting of the posterior six 

 marginals, with portions of the adjoining right and left fourth costals, and the fifth 

 vertebral plates. 



Carapace No. IV. — T. triserrata. Fragment, a little more complete than no. III. 

 • Both specimens are easily recognized as belonging to the typical T. triserrata, 

 because of the large, ventrally concave caudal plate, which is thin, strongly curved, and 

 measures 17"5 cm. in greatest width, 10 cm. in height. 



Carapace No. V. — T. indica. This fragment consists of the complete first, second, 

 third, and portion of the fourth vertebral plates ; portions of the right and left first 

 marginals, portions of the right and left first, second, and third costals. Greatest 

 length of fragment 43 cm. 



Its dorsal longitudinal profile is almost a straight line, only with a slight concavity 

 across the middle of the first vertebral plate. All the vertebrals are nearly flat, and 

 there is no indication of a swelling or hump on the fourth plate. 



The first marginals are likewise in the same flat dorsal level. Apparently the first 

 marginal scutes did not touch the costal plates. 



The anterior margin of this carapace is very peculiar {cf. PI. XLII. fig. 10). 



2z2 



