280 
DR. A. GUNTHER ON GIGANTIC LAND-TORTOISES. 
these two species are so great, that they alone would clearly prove 
their specific 
distinctness. 
T. elephantopus, 
T. vicina, 
790 millims. long. 840 millims. long. 
millims. 
millims. 
Length of scapula (measured from the coracoid") 
suture) 
•J 
200 
188 
Circumference in the middle of the shaft 
75 
75 
Longitudinal diameter of glenoid cavity . 
50 
55 
Length of coracoid 
86 
83 
Greatest width of coracoid 
70 
74 
Least width of neck of coracoid .... 
20 
33 
Length of acromium 
84 
78 
The humerus is so similar to that of T. elephantopus (and consequently very dis- 
similar to that of T. ephippium) that no detailed description is needed; 
but, as in the 
latter species, the canal for the blood-vessels on 
the radial edge, close 
to the elbow- 
joint, is deep and partly open. 
T. elephantopus. T. ephippium. 
T. vicina. 
millims. 
millims. 
millims. 
Length of humerus 
216 
235 
225 
Circumference of the narrowest part of the) 
1 L 
shaft ) 
89 
91 
95 
Longest diameter of the head .... 
40 
40 
40 
Shortest diameter of the head .... 
37 
35 
38 
Extreme breadth between the condyles 
82 
82 
81 
The bones of th e forearm (Plate 45. fig. D) are also shorter than those of T. ephippium. 
more similar to those of T. elephantopus , particularly with regard to the deeply emar- 
ginate radial edge of the ulna. Both bones are smooth, without prominent ridges or 
tuberosities. The ulna is twisted round its longitudinal axis, so that the transverse 
diameters of its proximal and distal dilatations would intersect each other at an angle of 
about 45°. The olecranon is not much developed. The articulary facet of the radius 
for the articulation with the humerus is a rectangular triangle, with the point directed 
backwards, and the shortest side in front. 
Length of ulna 
T. elephantopus , 
790 millims. long, 
millims. 
. . . 137 
T. ephippium , 
840 millims. long, 
millims. 
155 
T. vicina , 
840 millims. long, 
miliims. 
137 
Least width of ulna 
. . . 28 
26 
26 
Length of radius .... 
. . . 121 
149 
122 
Least circumference of radius 
. . . 50 
51 
49 
