FAUNA OF THE GOSATJ FORMATION. 



699 



veiled above, with the bevelled area also denned internally by a 

 sharp ridge, interior to which runs a slightly impressed broad prolon- 

 gation of the supraaxillary impression. In the carapace no neural 

 plate is preserved. The first costal plate (PI. XXXI. fig. 13) on the left 

 side is nearly perfect ; it is slightly arched, rather less than 10 centim. 

 long, and more than 3^ centim. wide at the lateral impression of the 

 first vertebral scute. It shows the oblique sutural surface for the 

 nuchal plate, which has a concave border about 3^ centim. long ; the 

 width of the union with the first neural plate is 2\ centim., but was 

 probably more, as the posterior border of the scute is imperfect. 

 The rib is not visibly distinct from the plate upon which it is sup- 

 ported, as it is in some species of Testudo ; it has a well- elevated 

 compressed head, 7 millim. deep and 4 millim. wide ; it is placed 

 obliquely, so as to look forward and outward. In the middle of 

 the plate the rib has become so depressed as to be only just recog- 

 nizable ; it is there 1 centim. wide ; but at the outer part of the 

 plate its extremity is prolonged beyond the plate, to unite appa- 

 rently with the marginal plate. Anterior to it, on the under 

 side, the plate is excavated (PI. XXVII. fig. 27), and the side 

 of the rib roughly striated, owing to attachment of the supra- 

 axillary process from the hyoplastron. This excavation extends 

 inwards from the extremity of the rib for 4j centim. A fragment 

 of the right plate shows its depth where it joins the first neural 

 plate to be 3| centim., and the greatest depth of the bone to be 

 about 4 centim. There are several fragments of costal plates ; but 

 they can only be identified by the scutal markings. "What appears 

 to be a third costal plate of the left side is impressed with the trans- 

 verse border dividing the second and third vertebral scutes for a 

 length of 3| centim. ; and since at this point the antero-posterior 

 measurement of the plate is only 3 centim., it shows that the ver- 

 tebral scutes were extremely broad relatively to their length, since 

 the length could not have exceeded 6 centim., while the breadth 

 could hardly have been less than 10 centim. The plate is arched, 

 showing that the carapace was as much elevated as in a testudinate 

 Chelonian. Its extreme length, without reckoning the curve, is 

 upwards of 11 centim. ; following the curve, the length is nearly 

 13 centim. The breadth of the plate, towards the outer margin, 

 is about 3^ centim. Its thickness at the proximal part is 4 millim., 

 and at the distal end 3 millim. On the under side the head of the 

 rib is moderately elevated; but its course down the plate is only just 

 perceptible, and marked by a smoother condition. It does not ap- 

 pear to have been prolonged at the distal margin. A plate from 

 the hinder part of the carapace, which is imperfect, also shows the 

 arched character strikingly. It is remarkable for its antero-posterior 

 extent of nearly 3| centim., and appears to be the last costal plate. 

 If so, it is impressed on its outer part with a vertebral scute. Hence 

 I infer this animal to have had a nearly circular outline, and to 

 have had the shield greatly elevated. It may be distinguished as 

 Emys Neumayri. 



