COCHLlODONTIDiE. 
201 
also St. John & Worthen, op. cit. vol. vii. pi. x. fig. 2.— ^ 
Coal Measures ; Santa Fe, New Mexico. 
Deltodus obliquus : Tanicdus obhquus, St. John & W oithen, op. cit. 
yoI. vii. p. 78, pi. xiii. fig. 10. —Chester Limestone; Illinois. 
Deltodus ornatus : Poecilodus ornatus, Newberry & Worthen, op. 
cit. yol. ii. (1866), p. 95, pi. viii. fig. 14.—Keokuk Lime¬ 
stone ; Illinois. 
Deltodus parvus, St. John & Worthen, op. cit. vol. vii. p. 151, 
pi. ix. figs. 1-5.—St. Louis Limestone : Iowa, Illinois, 
and Missouri. 
Deltodus powellii , St. John & Worthen, op. cit. vol. vii. p. lol, 
pi. x. fig. 1.—Carboniferous Limestone (? Coal Measures); 
Utah. = 
Deltodus propinquus, St. John & W orthen, op. cit. vol. vii. p. 156, 
pi. x. figs. 3, 4.—Coal Measures ; Illinois. 
Deltodus rossicus : Poecilodus rossicus, A. von Keyserling, Reise in 
das Petschoraland (1846), p. 292, pi. xxi. fig. 6.—Car¬ 
boniferous ; Kabosha. 
Deltodus sandalinus, L. G. de Koninck, Faune Calc. Carhf. Belg. 
pt. i. (1878), p. 63, pi. v. fig. 8.—Upper Carboniferous 
Limestone; Vise, Belgium. 
(?) Deltodus triangularis , H. Trautschold, loc. cit. vol. xiv, pi. vii. 
fig. 7 : Cocldiodus triangularis , H. Trautschold, loc. cit. 
vol. xiii. (1874), p. 292.—Carboniferous Limestone: 
Government of Moscow. 
Deltodus trilobus , St. John & Worthen, op. cit. vol. vii. p. 148, 
pi. ix. fig. 8.—Warsaw Limestone; Illinois. 
Deltodus undulatus, Newberry & Worthen, op. cit. vol. ii. p. 98, 
pi. ix. fig. 5.—Keokuk Limestone; Iowa 1 . 
The so-called Helodus(l) curvatus, L. G. de Koninck (Faune Calc. 
Carhf. Belg. pt. i. 1878, p. 40, pi. iv. fig. 15), from the Carbon¬ 
iferous Limestone of Belgium, is probably referable to Deltodus. 
Genus P^GiLOBUS, M‘Coy (emend. A. S. W.). 
[Brit. Paheoz. Foss. 1855, p. 638, in part.] 
Two posterior series of teeth in each jaw represented by a single 
much inrolled plate, generally antero-posteriorly elongated ; coronal 
surface marked by more or less distinct transverse lidges and fui- 
rows. Two prominent broadening ridges extend from the outer 
margin to the inner, the posterior of these being much the largest. 
1 Possibly to this species may be referred a fragmentary fossil from Warsaw, 
Illinois (P. 2455, Enniskillen Coll.). 
