50 FLORIDA GEOLOGICAL SURVEY-EIGHTH ANNUAL REPORT. 
Measurements of neurals in millimeters. 
No. 
Length 
Width 
Thickness 
4 
108 
185 
38 
5 
H 5 
150 
30 
6 
§7 
157 
27 
7 
78 
134 
27 
8 
73 ^ 
IIO 
24 
From the length of these neurals it is calculated that the cara¬ 
pace had a length of about four feet. Along the midline of the 
fourth neural there is a broad deep groove. The upper surface 
of the fifth neural slopes from both ends toward the scutal furrow 
which crosses it. That of the seventh is concave. The eighth 
neural is crossed by a scutal furrow. From the scutal furrow 
which crosses the fourth costal it is ascertained that the third ver¬ 
tebral scute had a width of 300 mm. The fourth vertebral scute 
extended back on the eighth neural plate. 
It is especially in the hinder lobe of the plastron where are 
found differences which distinguish this species from Testudo 
crassiscutata. Some of these differences are brought out in the 
following table of measurements. In the third column are given 
the dimensions that the bone of T. crassiscutata would have in 
case the first measurement were the same as in T. sellardsi, 238 mm. 
Measurements of xiphiplastra of Testudo crassiscutata and T. sallardsi, in 
millimeters. 
Dimensions taken 
T. sellardsi 
T. crassiscutata 
Actual 
Reduced 
From outer end of hypo-xiphiplastron to bottom 
of xiphiplastral notch- 
238 
255 
238 
Greatest thickness of xiphiplastron at suture 
just named - 
66 
85 
80 
Thickness of xiphiplastron at suture named and 
80 mm. from border 
40 
35 
33 
Thickness of xiphiplastron at midline and 40 
mm. in front of notch 
35 
32 
30 
Fore-and-aft extent of horn-covered portion of 
upper surface of xiphiplastral lobes- 
63 
83 
77 * 
From tip of xiphiplastral lobes to bottom of 
notch, along the border of the bone- 
84 
120 
112 
