570 T K S T T' I) O 11 K M 1 S IMf K K 1 C A. 



The gular scutes are acute behindhand encroach for three-fourths of an inch upon 

 the position of the entosternal plate. 



Internally the humeral scutes average eleven and a half lines long, and exter- 

 nally join the axillary and the fourth and fifth marginal scutes. 



The abdominal scutes are four and a half inches long, and join the sixth and 

 seventh marginal and the inguinal scutes. 



ADMEASUREMENTS. 



Inches. 



Estimated lingth of sternum, ...... 15 



Breadtli, . . . . . . _ _ ^ ] I 



Height, ......... (ii 



Length of niitcirn-po.sterinr curve of the ('arapaee (estimated), , . 'j.'2 



TESTUDO HEMISPIIERK^A. Lei<//j. 



(Tab. xii. h, figs. 1, 2.) 



Kmys hemispherica : Proe. Acad. Nat. Sci., vol. v., 173. 

 Tcstudo hemi.>^pherica : ib. 



This species was first established upon a specimen of a sternum with a small 

 portion of the carapace from the collection of Mr. Culbertson. 



In Dr. Owen's collection is a specimen consisting of almost the whole of a cara- 

 pace and sternum., but much fractured and otherwise mutilated. It is relatively 

 higher or more convex than any of the preceding, and is rather hemioval than 

 hemispherical as the name indicates. 



The costal plates were still connected by cartilage to the marginal plates at the 

 time the animal died. 



There are ten vertebral plates. The first is quadrilateral and twice as long as 

 broad. Those succeeding to the eighth inclusive are hexahedral. The second to 

 the fifth are nearly equal in size, and the others gradually decrease. The tenth 

 plate is a regular trapezium, enclosed by the ninth or inverted V-shaped plate and 

 the pygal plate, and is divided at its middle by the last vertebral scute. 



The first costal plate is thirty-three lines long by eighteen broad, and articulates 

 with the first, second, and three-fourths of the third marginal plates. 



The lateral marginal plates are nearly vertical, being bent under only in a 

 relatively slightly convex manner at their lower fourth. 



The first vertebral scute comes in contact with the first marginal plate at its 

 postero-internal angle, where it measures two and a half inches broad. The second 

 and third vertebral scutes are of nearly equal size, being two and a half inches wide 

 and twenty-two lines long. 



The axillary notches present outwards and downwards; the inguinal notches 

 downwards. 



The sternum anteriorly shelves upward, and its margin the breadth of the gular 

 scutes, though not truncated, is very obtuse, and posteriorly it is notched. 



