issg.] Geology aitd Paleontology. 905 
pressed, and narrow vertically. It is perfectly flat in the vertical 
plane, and not rounded as in Hadrosaurus foulkei, and has some super- 
ficial longitudinal ridges. The superior border of the ilium is narrow, 
except where it expands into an external angle above the point of 
junction of the ischium. The borders of the acetabulum are not ex- 
panded as in the Agathaumidse, and the acetabular border of the 
ischium is acute. The neural spines of the dorsal vertebrae are elon- 
gate, and some of them are so wide anteroposteriorly as to touch each 
other. The bones of the posterior leg are very long (see measurement 
of the fibula), and the fibula is very slender. The metatarsals are very 
robust, and the phalangeal faces have the usual concavity in the trans- 
As compared with the Diclonius mirabilis this species is as tall, but 
less robust. The scapula is longer and more slender, especially in its 
proximal portion. The distal part of the tibia is less robust, as are 
also the metatarsals. The heads of the mts. 2-4 are not as much com- 
pressed as in Diclonius mirabilis. 
Length of scapula, 850 
Width at neck, 100 
Width at blade, 195 
Length of ilium, 1000 
Length of anterior process of ilium, 45° 
Length of posterior process of ilium, 280 
Depth of ilium at acetabulum (about), 200 
Length of pectineal process from base, 385 
Width of pectineal process distally, 250 
Dia„etersdisu,e„d.ibia.{-— -.„,•,•,,• ; '/////.Z 
Diameters distal end mt. 3. { f^^XVt (okique); .' .' .' .' .' 'y'l 
Length mt. 4, 135 
Diameters distal end mt. ^f anteroposterior 65 
^' I transverse, 75 
Length of fibula, 890 
This is more slender than any of the Hadrosaurid^e known, 
but yields to none of these in dimensions. Its posterior legs are much 
longer than those of the Monoclonius crassus. 
Diclonius pentagonus Cope. Proceedings Acad. Nat. Sciences, 
Philadelphia, 1876, p. Oct. A lower jaw closely resembling that of this 
