COCHLIODONTID^. 
201 
also St. John & Worthcn, op. cit. toI. vii. pi. s. fig. 2. 
Coal Measures ; Santa Fe, New Mexico. 
Deltodus ohliquut: Taniodus ohliqmis, St. John & Woithen, op. cit. 
vol. vii. p. 78, pi. xiii. fig. 10. — Chester Limestone ; Illinois. 
Deltodus oniatus : Pwcilodus ornatus, Newberry & Worthen, op. 
cit. vol. 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. 
Uelludus poivellii, St. John & Worthen, oqi. cit. vol. vii. p. 154, 
pi. X. fig. 1 . — Carboniferous Limestone (? Coal Measures) ; 
Utah. 
Deltodus proqnnquus, St. John & Worthen, op. cit.vol. vii. p. 156, 
pi. X. figs. 3, 4. — Coal Measures ; Illinois. 
Deltodus rossicies : Pcecilodus rossicus, A. von Kc 3 ’serling, Ileise in 
das Petschoraland (1846), p. 292, pi. xxi. fig. 6.— Car- 
boniferous ; Kabosha. 
Deltodies sandalinus, L. G. do Koninck, Faune Calc. Carbf. 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 : Cochliodus triangularis, H. Trautschold, loc. cit. 
vol. xiii. (1874), p. 292. — Carboniferous Limestone; 
Government of Moscow. 
Deltodus trilohus, St.John ife 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 '. 
The so-caUed Helodus(^.) curvatus, L. G. de Koninck (Faune Calo. 
Carbf. Bclg. pt. i. 1878, p. 40, pi. iv. fig. 15), from the Carbon- 
iferous Limestone of Belgium, is probably referable to Deltodus. 
Genus PCBCILODUS, M‘Coy (emend. A. S. W.). 
[Brit. Palacoz. Foss. 1855, p. 638, in part.] 
Two posterior series of teeth in each jaw represented by a single 
much inrolled plate, generally antero-postcriorly elongated ; coronal 
surface marked by more or less distinct transverse ridges and fur- 
rows. Two prominent broadening ridges extend from the outer 
margin to the inner, the posterior of these being much the largest. 
^ Possibly to this species may be referred a fragtnenhiry fossil from Warsaw, 
Illinois (P. 2455, Enniskillen CoU.). 
