172 
MR. J. W. HULKE ON POLACANTHUS FOXII. 
joins the ilium, to 4 - 7 centims. at its ventral or mesial end. Its direction appears to 
be nearly transverse to the long axis of the trunk, and not almost pai'allel to this, as 
in Iguanodonts. Whether the ischia actually met in symphysial union cannot be 
ascertained from this specimen, as the mesial end is missing. 
Explanation of Plates. 
PLATE 8. 
Dorsal View of Shield. 
L. v. Lumbar vertebrae. 
C. v. Caudal vertebrae. 
I sell. PdoLt ischium. 
O 
Isch.' Left ischium. 
PLATE 9. 
Ventral View of Shield and Pelvis. 
L. v. Lumbar vertebrae. 
C. v. 1 st caudal vertebra. 
S. 1 , 2, 3, 4, 5. Sacral vertebrae. 
a. Acetabulum. 
Isch. 
Eight ischium. 
Isch.' 
Left ischium. 
r. 
Itibs. 
t. 
Ossified tendons. 
