96 HADROSAURUS. 
The measurements of this bone are as follows :— 
Inches. Lines. 
Extreme length : ; : : ; : : ; ‘ Bn 
Depth of shaft at middle . : ; 2 : : : eg eine 53 3 
Thickness of shaft at middle 2 
Height of tarsal extremity : , : é : 6 
Width of tarsal extremity . ; ; P : ; ; eS 
Height of phalangial extremity ; : : é ; : “theo 6 
Breadth of phalangial extremity above 3 9 
Breadth of phalangial extremity below 4 1 
A proximal phalanx of the hind foot, represented in Figs. 11, 12, Plate XIV, is 
the only bone of the toes preserved in the collection of Hadrosaurus remains. It 
bears a near resemblance in size and general form and proportions with the corre- 
sponding bone of the Jgwanodon, as represented in Prof. Owen’s Fig. 1, Plate X XI, 
of the British Fossil Reptiles, Dinosauria. It is oblong square and moderately 
expanded at the extremities. The proximal extremity, being the widest and 
deepest portion of the bone, presents a reniform articular surface, which is in the 
slightest degree concave. ‘The distal extremity is deeply impressed at the sides for 
ligamentous attachments. The articular surface is likewise reniform in outline, 
vertically convex, and hardly depressed towards the median line. The measure- 
ments of this bone are as follows :— 
Inches. — Lines. 
Extreme length : : : ‘ : é : . . ca @ 
Breadth at middle of shaf 3 9 
Height at middle of shaft 2 4 
Breadth of proximal extremity 5 4 
Height of proximal extremity . 3 2 
Breadth of distal extremity 4 5 
Height of distal extremity 2 2 
Among the collection of Hadrosawrus remains are several bones whose position 
in the skeleton I am unable positively to determine. One of these, represented in 
Figs. 4, 5, Plate X VII, most nearly resembles that indicated by Prof. Owen’ and 
Dr. Mantel?’ as the ilium of the Jguanodon. 
Assuming the bone to be a left ilium, it consists of a broad, thick plate, prolonged 
into a long hook-like process, which curves backward and inward and is broken at 
the extremity. The opposite extremity of the bone is likewise broken. The inner 
border of the broad intermediate plate exhibits a long, ellipsoidal, irregular articular 
surface for junction with the sacrum. From the outer border of the plate there 
projects forward a massive trilateral tuberosity, roughened externally and at the 
summit, which probably corresponds with the process projecting from the fore part 
of the ilium in the Jywana and Cyclura. The length of the specimen in its present 
imperfect condition, measured in a straight line, is twenty-seven inches, and its 
greatest breadth is nine inches anda quarter. The sacral articular surface is a 
foot in length and about one-fourth that breadth. 
* British Fossil Reptiles, Dinosauria, Plates I and IT. 
® Petrifactions and their Teachings, page 306, lignograph 66. 
