46 The Amblypoda., [ January, 
The cranium in this genus is elongated and compressed. The 
muzzle is posteriorly roof-shaped, but is anteriorly concave and 
flattened out into a bilobed protuberance which rises above the 
extremity of the nasal bone. This extremity is subconic and short 
and decurved. A second pair of horn-cores stands above the 
orbits, each one composed externally. of the maxillary bone, and 
internally of an upward extension of the posterior part of the nasal. 
Behind this horn the superior margin of the temporal fossa sinks, 
but rises again at its posterior portion, ascending above the level of 
the middle of the parietal bones. The occipital rises in a wall 
upwards from the foramen-magnum and supports, a little in front 
of the junction with the superior and posterior crests bounding 
the temporal fossa, a third horn-core on each side. 
Fic. 28 =< Lesolophoon spierianus Foes skull from left side, one-eigh 
s th natu- 
ral size; from er beds of Wyoming. From Osborn, Memoir pd Loxolo- 
phodon, ete. 
The three species may be ciistiticndatied as follows: 
Maa -o i in section, with internal tuberosity, and above ora ; occi- 
put 
ma homs s subquadrate i in section without internal tuberosity ; occiput s nasal 
ber 
bees li 
Median horns subround and without tuberosity, in front or orbits ; occiput Meg 
tubercles narrow Z. spierianus 
eas ee 
