208 MR. RUDOLF MARTIN ON A FOSSIL [ Mar. 3, 
distance between the antitrochanter and the lateral edge 
of the area dorsalis is relatively longer in the fossil than 
in most of the recent medium-sized Ostriches; but on one 
side this distance cannot exactly be determined in the fossil 
(because the antitrochanter is broken away and the edge 
of the area dorsalis is much rounded), and on the other side 
the individual variation in this regard in S. camelus is very 
great. The largest individuals of this species differ but 
little from the fossil, and very probably the fossil pelvis at 
my disposal must be referred to an adult and rather large 
animal. 
The distance between the dorso-mesial borders of the ilia is 
somewhat shorter in the fossil than in most of the pelves of 
S. camelus with which I have compared it. But it is in this respect 
that individual variation has the greatest amplitude, and in the 
largest pelvis of S. camelus at my disposal this distance is equal 
to that of the fossil. 
S. karatheodoris. S. camelus. 
Costal process of the Ist “true sacral 
vertebra” to the distal border of the 
2nd postsacral vertebra ..............-..+.-- 78cm. 9-2 cm. 
Width of the centra of the “true sacral 
VOTED IAA Ase ae Lek A sea AL aa ate 2:5 1:8 
Width of the centrum of the 2nd postsacral 
Aifer Mee] OV ee AN) Mec AMC A eer a RMR a ey 2°8 Died 
Greatest width of the dorsal surface of the 
WOLVAS S58 Yc arthur ae eatc i enenmen URINE Birr 12 12°2 
Plummet in the dorsal border of the anti- 
trochanter to the median plane ......... ca. 12 12 
Plummet in the dorsal border of the anti- 
trochanter to the plane of the dorsal 
Suistace iofibhenpelvisiees ae nsaee-eeeeeeeaaee ca.6°5 4 
The results show that there are great differences in the pro- 
portions of the pelvis of the two species which justify a 
separation of the fossil from the recent Ostrich. The individual 
variation, however, does not allow us to place the two forms in 
different genera, because it greatly reduces the differences above 
mentioned. 
I have said that the separation of the two Ostriches in different 
species was justified. On the other hand, the question arises, 
whether or no the differences between the two forms be not the 
consequences of a pressure acting during the great tectonic trans- 
formations in the region between Asia Minor and Greece. A 
study of the other fossils of Samos, however, gives no evidence of 
such a force ; there is only a lateral compression to be seen, a result 
of the pressure of the weight of the more recent strata. 
These considerations add to the importance of the features which 
I have selected for special comment, whilst on the other hand other 
