Correspondence. 
253 
D. ferox, Marsh 22 
D. vor ax, Marsh 22 
Dipriodon robustus, Marsh.. . 22 
Dryolestes tenax, Marsh 22 
Elotheriuni coarctatum, Cope 16 
Hadrosaurus breviceps , 
Marsh 25 
H. paucidens, Marsh 25 
Halodon sculptus, Marsh. ... 22 
H. formosus, Marsh 23 
Haplacodon augustigensis, 
Cope 15 
Hippotherium relictum, Cope 3 
Hypertragulus transversus, 
Cope 15 
Ischypterus alatus, Newb. . . . 29 
I. braunii, Newb 29 
I. elegans, Newb 29 
I. gigas, Newb 29 
I. lenticularis, Newb 29 
I. lineatns, Newb 29 
I. micropterus, Newb 29 
I. minutus, Newb 29 
I. modestus, Newb 29 
Lamna manitobensis, Whit- 
eaves 34 
Leptomeryx esulcatus, Cope. 15 
L. semicinctus, Cope 15 
Menodus selwynianus, Cope. 16 
M. syceras, Cope 15 
Monoclonius fissus, Cope. ... 14 
M, recurvicornis, Cope 14 
M. sphenocerus, Cope 14 
Morosaurus lentus, Marsh. . . 25 
M. agilis, Marsh 25 
Nanomys minutus, Marsh .... 22 
Nodosaurus textilis. Marsh. . 24 
Oracodon anceps. Marsh 23 
Pediomys elegans. Marsh 22 
Platacodon nanus. Marsh,. . . 23 
Plioplarchus septemspinosus 
Cope 7 
Ptycholepsis marshii, Newb.. 29 
Ptychodus parvulus, Whit- 
eaves 34 
Selanacodon brevis, Marsh.. . 23 
S. fragilis. Marsh 22 
Stagodon nitor. Marsh 23 
Tetrabelodon brevidens, Cope 14 
Triceratops flabellatum, 
Marsh 24 
T. galeus, Marsh 24 
T. horridus, Marsh 24 
Tripriodon caperatus. Marsh. 22 
T. coelatus, Marsh 22 
CORRESPONDENCE. 
Additions and corrections to Miller's North American palaeon- 
tology. Nothing better illustrates the necessity recently urged by the 
writer in the American Naturalist, for some concerted action to secure 
the authoritative compilation of literature, especially the descrip- 
tion of new species, than the manifest impossibility for any indi- 
vidual to be perfectly sure of complete success in attempting a synop- 
sis of the described species known from any period. While, no doubt, 
honestly designed to secure completeness, the valuable work quoted 
above loses something of its authoritativeness because of sundry 
omissions. It is, therefore, suggested that the lack may be measur- 
ably supplied, for the present, if those who detect such omissions 
make it their business to supply the data to the public, for which pur- 
pose the Geologist might be a suitable avenue. 
A list herewith communicated consists chiefly of species figured by 
C. L. Herrick in the several bulletins of Denison University from 
18S7 to 1889. For the sake of brevity these species are followed by 
simply a Roman and an Arabic numeral, the former indicating the 
volume, the latter the page. Vol. ii appeared in May, 1887, vol. iii in 
April, 1888, vol. iv in December, 1888. 
Two other species may also be added as follows : 
