AND CLASSIFICATION OF THE FOSSIL KEPT ILIA. 
201 
differs from the type in being as long as five-and-a-half of the middle caudal vertebrae, 
and as long as six-and-a-half of the early caudals. Moreover, the two femora are of 
different type ; that in T. 9 being more expanded transversely at both the proximal 
and distal ends. The 23 caudal vertebrae of the type specimen measure as many 
centims.; the first 23 vertebrae in the tail in Link’s fossil measure 38 centims. If, 
on the evidence of the femur, the proportions of size between these animals may be 
taken as 7 to 10, then the 23 caudal vertebrae of the type would have measured 
26'6 centims., or almost a sixth longer than is the case. 
In the type I recognise two sacral vertebrae; in Link’s fossil there are three, 
according to von Meyer. In the type I can only count sixteen vertebrae between 
the neck and the sacrum, where they measure 19 centims. In Link’s fossil there are 
not fewer than eighteen vertebrae in this region, measuring 30 centims. Seven-tenths 
of 30 being 21, it follows that the dorsal vertebrae in the type, besides being fewer, are 
relatively rather longer. The neural spines in the type are 6 millims. wide ; here the 
width is double. The neural spines of the dorsal vertebrae in the type are 9 millims. 
high ; here the height is about 2’2 centims. This is such a difference as might be 
attributed to age, but the aggregate of the other characters seems to me of specific value. 
I accordingly separate Link’s fossil as a distinct species, which may be termed 
Protorosaurus Linkii; until the discovery of better materials shall determine whether 
it can remain in the same genus. 
Among other characters seen in Link’s specimen are all the details of the fore 
and hind limbs, showing the humerus to be 7'4 centims. long; the ulna 6T centims. 
long; the longest metacarpal about 1*9 centim. long, and the longest metatarsal 
4’3 centims. The cervical vertebrae are relatively massive, 2 - 7 centims. long, and have 
the upper border of the neural arch nearly horizontal, without any trace of the 
posterior attenuation seen in the type of Protorosaurus S-peneri. The caudal vertebrae 
show no transverse processes. 
I would next compare Swedenborg’s specimen, figured by von Meyer l.c. in T. 8. 
This is a smaller animal than Link’s, of less robust type. The cervical vertebrae 
resemble those of Link’s fossil in the contour of the neural arch, which is quite distinct 
from the College of Surgeons specimen, though there is more resemblance to the latter 
in the ridges on the centrum. Yon Meyer’s drawing, however, gives no indication of 
the possibly opisthocoelous articulation which appears to be indicated in the drawing 
of Link’s fossil. The shape of the femur is altogether Dinosaurian, and quite distinct 
from that in Link’s specimen, where it has a Crocodilian or Chelonian curvature. It 
is more than an eighth shorter than in Link’s type. The tibia is a sixth shorter. 
The metatarsus is a fourth shorter. The ulna is a fifth shorter. The cervical 
vertebrae are of the same length ; the dorsal vertebrae one-eighth shorter ; while the 
caudal vertebrae, which have transverse processes, have a uniform length of IT 
centim., and are therefore relatively very short. The pelvic bones are badly preserved 
in Swedenborg’s fossil ; but if the large expanded bones which lie in the sacral 
MDCCCLXXXVII.—B. 2 D 
