HATCHER: OSTEOLOGY 
OF HAPLOCANTHOSAURUS 
27 
is very rugose and this rugosity is continued along the superior surface of the 
greater trochanter to the external surface of the shaft. Both the internal and external 
margins of the shaft of the femur curve very gently outward as shown in Fig. 14. 
The principal dimensions of the femur are as follows: 
mm 
ome t emer rcs ru rh eee eens tuna Bae hie 1275 
Transverse diameter at proximal end....................... 353 
oe ue OG HIS{E Mig ies Caara gens ieee mea 309 
ee ue Smid dllesoteshatimertceereernceeenes: 207 
CONCLUSIONS. 
When considered together the remains upon which the 
present genus and species are based indicate an animal of 
rather unusual proportions for a member of the Sauropoda. 
The number of dorsals and the comparative length of the 
individual dorsals indicate a thoracic region proportionally 
longer than in Diplodocus, Brontosawrus or Morosauwrus. 
While the cervical region appears somewhat abbreviated 
and the caudal region must have been remarkably short as 
is indicated by the reduced length of the individual verte- 
bree, though this was probably made less apparent by an in- 
crease in the number of caudals. Judging from the femur 
alone the limbs were comparatively long, and the animal 
proportionately high and short for a Sauropod dinosaur. 
HAPLOCANTHOSAURUS UTTERBACKI sp. nov. 
(No. 879.) 
The present species is named for Mr. W. H. Utter- 
back, its discoverer, and in recognition of his services to 
vertebrate paleontology. 
Char. Sp.: It is readily distinguished from H. priscus, 
the type species of the genus by the character of the pos- 
terior dorsal centra which are rather more opisthoccelous 
than in the type species. The fully adult indiviual was 
doubtless of larger size in the present than in the first 
named species of the genus. But the most distinctive 
character is to be found in the sacrum which, in the 
present species, has the five neural spines normally codés- 
sified. The first four are codssified throughout their 
See 
Left femur of 
Fic. 14. 
Haplocanthosaurus priscus, 
front view, seen obliquely 
from within (No. 572), 7; nat. 
ural size. h., head; gt., greater 
trochanter; ¢r., fourth tro- 
chanter; 7. e., internal con- 
dyle; e.c., external condyle ; 
i.g., inter-condylar groove. 
