C0CHLI0D0XTID.E. 
189 
(?) 1879. Deltodus grandis, J. S. Newberry, Aim. Rep. Geol. Surv. 
Indiana, 1876-78, p. 344. 
1883. Scindalodus Icevissimus , St. John & AV or then, Pal. Illinois, 
yoI. yii. p. 186, pi. xii. figs. 8, 9 (in part). 
Type. “ Lower ” dental plate. 
The long axis of the “ lower ” posterior dental plate attaining a 
length of 009, and its maximum breadth about 0-03; obtuse 
anterior ridge angulated. “Lower” posterior dental plate sub- 
triangular ; coronal surface considerably elevated, with one or two 
slight median ridges extending from the outer to the inner border, 
becoming angulated outwards. 
The above synonymy is copied from Messrs. St. John and AVorthen, 
who have had the opportunity of studying the original specimens. 
The same authors doubtfully ascribe a third form of tooth, much 
inrolled, to a “median” position upon the mandible of this species; 
they also reverse the terms “ upper ” and “ lower ” as here pro¬ 
visionally employed. 
Form. Loc. Keokuk Limestone (Lower Carboniferous) : Iowa, 
Illinois, and Missouri, TJ.S.A. (?) St. Louis Limestone : Indiana 
P. 2491. Incomplete “ lower ” dental plate ; AVarsaw, Illinois. 
Enniskillen Coll. 
P. 2490. Two similar, but larger, specimens; AAMrsaw, Illinois. 
Enniskillen Coll. 
Sandalodus complanatus (Newberry & AA T orthen). 
1866. Deltodus complcinatus , Newberry & Worthen, Pal. Illinois, 
vol. ii. p. 98, pi. ix. fig. 4. 
1866. Trigonodus major, Newberry and AAMrtlien, tom. cit. p. 112, pi. xi. 
figs. 8, 9. 
1883. Sandalodus complanatus, St. John & Worthen, Pal. Illinois, 
vol. vii. p. 184, pi. xii. figs. 1, 2, (P figs. 3, 4). 
Type. (?) “ Upper ” dental plate. 
“ Upper ” dental plate having the antero-lateral margin about 
equal in length to the inner margin; two rounded coronal ridges 
from the outer to the inner side irregularly connected in the middle. 
“ Lower ” dental plate sub triangular, with the postero-lateral border 
much longer than either of the others, which are about equal; 
coronal surface raised anteriorly, though with a narrow antero¬ 
lateral “ wing.” 
Form, Loc. Burlington Limestone (Lower Carboniferous): 
Illinois. 
