Sieh a 
ae 
Panels x, 
Be Al 
ae 
1274 General Notes. [ December, | 
the relations of the facial bones to each other. Moreover the 
anterior angle of the presymphysial bone bears some crests or 
denticles of bone, which, had the bone been by any means forced 
away from a previous union with the premaxillary, must certainly 
have been broken off. 
The coronoid process consists, in the order of their importance, 
of the dentary externally, the coronoid internally, and a vertical 
process of the articular posteriorly. It thus differs widely from 
that-of the chelonians and lizards of the present age, in which it 
is formed of the coronoid element only, and from that of the 
ophidians, which is largely composed of the surangulat, but 
approaches more nearly that of Hatteria, in which it is formed 
of coronoid and dentary. From all existing reptiles it differs in 
its position externally to the alveolar border and anterior to the _ 
end of the dentary series. The premaxillaries do not differ : 
greatly in their structure from those of Hypsilophodon. The 
frontals do not form any part of the upper orbital border, from 
which they are separated by two supra-orbitals. These are b e 
upon the two pre-frontals, which are also thus excluded from the 
` exterior upper border of the orbit. Asa whole, the skull pe a 
sents a far greater number of points of resemblance to H ndible i 
than to any other living reptile. Each ramus of the ma ek 
bears twenty-one teeth in use, and numerous partially pers 
cervical, 
rows on the internal face; while each maxillary carries 
eighty-five in all; while the ribs consist of nine cervica © 
seventeen dorsal pairs, as the atlas and last dorsal pe Diclo- 
ribs. In an appendix M. Dollo compares Iguanodon ee 
nius mirabilis,’ and finds that his “ presymphysial f Professor 
tical with the “flat, thin and edentulous” dentary 0 he 
Discovery OF TRACKS IN THE JURA-TRIAS OF Coy ae ffy 
fessor H. W. Parker, of Iowa College, has discovered 8°” — 
animal footprints in the vicinity of Denver. . a 
Of the slabs which he obtained one is about five feet lone . 
of tracks, Ds ee 
and a half inches long, and with a stride of ney ect to fort 
and a straddle of five inches. The peculiarity ne ihe ends ¥ 
is, that every track exhibits but one apparent digi t threes} z 
eighteen dorso-lumbar, six sacral and fifty-one caudal ve ost 
S 
slab gives five pairs of footprints, much 
enough, part of each is rounded li the ‘st 
sea-weeds. No hoofed animals lived then, ane — I th 
very smal) in proportion to the size of the prints. am 
1 E. D. Cope, AMER. NAT., July, 1883, p. 774-7- 
