THE aiGANTIC LAND-TOETOISE OF EODEiaUEZ. 
59 
surface is very much constricted. It must be mentioned that there are in the collection 
a right and a left scapula, evidently belonging to the same individual, which differ re- 
markably from all the others in not having the coracoid ankylosed, although the indi- 
vidual appears to have been fully adult, and in having the body of the scapula proper 
uniformly compressed. It is difficult to account for this apparently individual aberration. 
The measurements of this bone are the following, a and l being more stoutly built 
than c and d : — 
a. 
h. 
c. 
d. 
millim. 
millim. 
millim. 
millim. 
Length of scapula measured from the suture with the coracoid . 
.. 205 
146 
168 
135 
68 
43 
42 
38 
Longitudinal diameter of glenoid cavity 
50 
35 
38 
32 
73 
60 
66 
51 
70 
(?) 
54 
45 
73 
55 
65 
51 
On comparing with each other a considerable number of humeri (Plate XXV. fig. C), 
they can be arranged in two groups: — 1, a slender form, with distinctly trihedral 
shaft ; to this belong specimens some of which are nine inches in length ; other, 
smaller ones clearly show by the porous structure of their epiphyses that they belonged 
to young or half-grown individuals. 2. The second form of humerus has a shorter and 
stouter shaft, and is rather flattened from the front backwards than trihedral. The 
specimens of this form do not exceed five inches in length ; yet they are clearly bones of 
old individuals in which growth had ceased. As we know that in all the other gigantic 
Tortoises, with the life-history of which we are acquainted, the male greatly exceeds in 
size the female, it appears to be almost certain that the large bones belonged to the 
male and the smaller to the female sex. In other respects the various humeri exhibit 
the following characteristics. The head is nearly entirely raised above the level of the 
summit of the radial tuberosity; the ulnar tuberosity is raised high above the level of 
the head, from which it is separated by a deep groove ; the ulnar margin of the shaft is 
much curved, the opposite margin being nearly straight. The canal for the blood- 
vessels, on the radial edge of the bone close to the elbow-joint, is perfectly bridged over, 
perforating the substance of the bone from the front to the hinder side. The following 
measurements are taken from an individual supposed to have been a full-grown male 
(«), half-grown male [b), and adult female [c) : — 
a. h. c. 
millim. millim. millim. 
Length of the humerus (measured in a straight line from the summit of 
the head to the middle of the trochlea) 210 120 108 
Circumference of the narrowest part of the shaft 75 41 44 
Longest diameter of the head 39 22 21 
Shortest diameter of the head 38 19 IQ 
Extreme breadth between the condyles 64 39 37 
I 2 
