COCHIIODONIID^. 
205 
Poecilodus cestriensis, St. John & Worthen, tom. eit. p, 135, 
pi. viii. figs. 15-17. — Chester Limestone ; Illinois. 
('!}Poedlodus parado.viis,W. Waagon, Pal. Ind. ser, 13, pt. i. 
(1870), p. 12, pi. i. fig. 1. — Productus Limestone; Salt 
Eangc, India. 
Poecilodus rugosus, Newberry & Worthen, Pal. Illinois, vol. ii. 
(1866), p.94, pi. viii. fig. 13. — Keokuk Limestone; Illinois. 
Poecilodus sancli-ludovici,^t. & Worthen, tom. cit. p. 132, 
j)l. viii. figs. 11, 12 (? figs. 8-10). — St. Louis Limestone ; 
Missouri, Illinois, and Iowa. 
Poecilodus varsouviensis, St. John & Worthen, tom. cit. p. 131, 
pi. viii. figs. 13, 14. — Warsaw Limestone ; Illinois. 
The so-called P. spritigeri (St. John & Worthen, tom. cit. p. 138, 
pi. viii. fig. 19), from the Lower Carboniferous Limestone of Santa 
Fe, New Mexico, and P. vortheni (St. John, tom. cit. p. 136, pi. viii. 
fig. 18), from the Chester Limestone of Illinois, are founded upon 
teeth which would, in Europe, bo regarded as referable to Delto- 
ptychius. 
The tooth from the Belgian Carboniferous Limestone named 
Poecilodus (1) elegans by L. G. de Koninck (Faune Calc. Carbf. 
Belg. pt. i, p. 59, pi. vi. fig. 17) is generically indeterminable. 
The Russian Carboniferous teeth named P. liiigulattis and P. sul- 
catus by H. llomanowsky (Bull. Soc. Imp. Nat. Moscou, 1864, 
pt. ii. p. 164, pi. iv. figs. 28, 29) are extremely doubtful frag- 
ments, and may even pertain to Jmuissa. Tho same remark applies 
to P. couvolutus, Newberry & Worthen (Pal. Illinois, vol. iv. 1870, 
p. 366, pi. ii. fig. 9), from the Keokuk Limestone of Illinois. 
Genus COCHIiIODUSy Agassiz. 
[Poiss. Foss. vol. iii. 1838, p. 113.] 
Two posterior series of teeth in tho “ lower ” jaw represented by 
two separate dental plates, having the outer border much inrolled. 
Posterior dental plate elongated antero-posteriorly ; postcro-lateral 
and autero-latcral borders rapidly converging outwards, the second 
almost at right angles to the long axis of the supporting cartilage ; 
coronal contour raised by a median rounded ridge, extending from 
tho outer to the inner border. Anterior dental plate very narrow’, tho 
hinder portion of the crown raised into a high, obtuselj’-angulated 
ridge, extending from tho outer to tho inner border. Coronal surface 
without transverse corrugations. Symphysial teeth small and feebly 
prehensile. 
