60 
SELACHn. 
Trans. Amer. Phil. Soc. [2] toI. xi. (1857), p. 90, pi. v. 
figs. 27—29. — St. Louis Limestone ; Missouri, Illinois. 
Polyrhizodus longus, H. Trautschold, Nouv. Mem. Soc. Imp. Nat. 
Moscou, vol. xiv. (1879), p. 50, pi. vi. figs. 9, 10. — Carbo- 
niferous Limestone ; Mjatschkowa, near Moscow. 
Polyrhizodus (Dactylodus) minimus, St. John & Worthen, tom. cit. 
p. 391, pi. xiii. fig. 19. — St. Louis Limestone ; Illinois. 
Polyrhizodus modestus, J. S. Newberry, Pop. Geol. Surv. Ohio, 
vol. ii. pt. ii. (1875), p. 50, pi. Iviii. fig. 10. — Lower 
Carboniferous ; Ohio. 
Polyrhizodus nanus, St. John & Worthen, tom. cit. p. 386, pi. xiii. 
fig. 15. — Keokuk Limestone ; Iowa. 
Polyrhizodus piasaensis, St. John & Worthen, tom. cit. p. 386, 
pi. xiii. fig. 12.— Warsaw Beds; Illinois. 
Polyrhizodus ponticulus, Newberry & Worthen, op. cit. vol. ii. 
p. 51, pi. iii. fig. 11 . — Chester Limestone ; Illinois. 
Polyrhizodus porosm, Newberry & Worthen, op. cit. vol. ii. p. 49, 
Burlington Limestone ; Illinois, Iowa. 
Polyrhizodus (Dactylodus) princeps, Newberry & Worthen, op. cit. 
vol. ii. p. 45 ^ pi. ill. Louis Limestone ; 
Missouri. 
Polyrhizodus Jruncatus, Newberry & AVorthen, op. cit. vol. iv. 
p. 35/, pi. HI. fig. 16.— Burlington Limestone; Illinois. 
Polyrlnzodus williamsi, St. John & AVorthen, tom. cit. p. 384, 
pi. X. A. fig. 23, pi. xiii. fig. 11. — Keokuk Limestone; 
Missouri, Iowa. 
Genus GLOSSODUS, McCoy. 
[Ann. & Mag. Nat. Hist. [2] vol. ii. 1848, p. 127.] 
Teeth tongue-shaped. Crown very thick, and coronal margin 
obtuse and rounded. Root long, as wide as the crown, terminating 
below in two points. 
Glossodus lingua-bovis, McCoy. 
^^‘=Coy,Ann.& Mag. Nat. Hist. [2J 
18^. Glossodus marginatus, F. McCoy, tom. cit. p. 128. 
pi S Foss. p. 029, 
] 
