COCHLIODONTin,®. 
189 
(?) 1879. Deltodiis grandis, J. S. Newberry, Ann. Rep. Geol. Surv. 
Indiann, 1870-78, p. .344. 
188.3. Sandahdus krcinsimtis, St. John & 'Worthen, Pal. Illinois, 
Tol. vii. p. 186, pi. xii. figs. 8, 9 (in part). 
Tgps. “ Lower ” dental plate. 
The long axis of the “ lower ” iwsterior dental plate attaining a 
length of 0-09, and its maximum breadth about 0-03; obtuse 
anterior ridgo angulatod. “Lower” posterior dental plate sub- 
triangular ; coronal surface considerably elevated, with one or two 
slight median ridges c.xtending from the outer to the inner border, 
becoming angulated outwards. 
The above synonymy is copied from Messrs. St. John and Worthen, 
who have had the opportunity of studying the original specimens. 
The same authors doubtfully ascribe a third form of tooth, much 
inroUed, 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 Missoiu'i, U.S.A. (?) St. Louis Limestone : Indiana 
P. 2491. Incomplete “ lower ” dental plate ; Warsaw, Illinois. 
FnnisMlen Coll. 
P. 2490. Two similar, but larger, specimens ; Warsaw, Illinois. 
Ennisliillen Coll. 
Sandalodus complanatus (Newberry & Worthen). 
1806. Delfodus complanatiis, Newberry & Worthen, Pal. Illinois, 
vol. ii. p. 08, pi. ix. fig. 4. 
• 1800. Triyonodus major, Newberry and Worthen, tom. cif. p. 112, pi. xi. 
figs. 8, 9. 
188.3. Sandalodus complanatus, St. John & Worthen, Pal. Illinois, 
vol. vii. p. 184, pi. xii. figs. 1, 2, (? figs. 3, 4). 
Type. (?) “ Upper ” dental plate. 
“ Upper ” dental plate having the antero-Iateral 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 subtriangular, 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. 4' Burlington Limestone (Lower Carboniferous) : 
Illinois. 
