188 
SELACHI1. 
suring about 0-022. This plate is narrow, compressed, and pointed 
at one extremity, with the crown raised into a high median angulated 
ridge. 
Form. £ Log. Iveokuk Limestone (Lower Carboniferous): Illinois, 
U. S. A. 
P. 2488. Typical dental plate ; Warsaw, Illinois. Enniskillen Coll. 
Sandalodus carbonarius, Newberry & Worthen. 
1866. Sandalodus carbonarius, Newberry & Worthen, Pal. Illinois, 
yoI. ii. p. 104, pi. x. figs. 4, 5. 
1866. Eeltodus angularis , Newberry & Worthen, tom. at. p. 97, pi. ix. 
fig. 1. 
(?) 1870. Eeltodus (?) angularis, 0. St. John, Proc. Amer. Phil. Soc. 
vol. xi. p. 437. 
(?) 1872. Eeltodus (?) angularis, O. St. John, in Hayden’s Final Rep. 
U.S. Geol. Surv. Nebraska, p. 244, pi. vi. fig. 18. 
1883. Ortkopleurodus carbonarius, St. John & Worthen, Pal. Illinois, 
yoI. vii. p. 192, pi. xiii. figs. 6-8. 
Type. “ Lower” dental plate. 
A small species. “ Lower” dental plate sub-spatulate, expanded 
anteriorly, becoming narrow and pointed behind ; crown low, with 
a Taint angulated ridge along the long axis of the plate near the 
straighter margin. “ Upper ” dental plate originally described 
as Eeltodus angularis. 
Form. Log. Coal-Measures: Illinois, Kansas, Indiana, Iowa, 
(?) Nebraska, and Missouri, U.S.A. 
P. 2489. Dental plate, wanting narrowed extremity: La Salle, 
Illinois. Enniskillen Coll. 
Sandalodus Isevissimus, Newberry & Worthen. 
1866. Sandalodus Icevissimus, Newberry & Worthen, Pal. Illinois, 
vol. ii. p. 104, pi. x. figs. 6-8. 
1866. Sandalodus grandis, Newberry & Worthen, tom. cit. p. 105, pi. x. 
fig. 9. 
1866. Eeltodus grandis, Newberry & Worthen, tom. cit. p. 101, pi. ix. 
fig. 9. 
1866. Cochlio'dus? crassus, Newberry & Worthen, torn. cit. p. 91, pi. xiii. 
fio- 9 
1866. Psammodus ? semicylindricus, Newberry & Worthen, tom. at. 
p. 109, pi. xi. fig. 4. 
1866. Psammodus ? rhomboideus, Newberry & W ortlien, tom. at. p. 110, 
pi. xi. fig. 6. 
