226 
SKLACHII. 
X. Much arched narrow tooth. 
P. 2911. Typo specimen of lihumphodm dUpar, J. \V. Davis, 
tom. eit. p. 402, pi. li. fig. 17 ; Armagh. Eimiskillen Coll. 
Most of the teeth upon which the following “ species are 
founded are also referable to the anterior portion of the jaws o 
Cochliodonts, but there are no examples in the Collection : 
Jldodus antiquisdniuK, E. von Eichwald, Leth. Uoss. vol. i. (1869), 
p. 1545. — Carboniferous Limestone ; Government of Toula. 
Helodus aversus, H. Trautschold, Nouv. Mem. 8oc. Imp. Nat. 
Moscou, vol. xiii. (1874), p. 268, pi. xxvi. fig. 8.- Car- 
boniferous Liirestone ; Government of Toula, liussia. 
t/elodus hiformis, Newberry & Worthen, Pal. Illinois, vol. ii. 
p. 77, pi. iv. fig. 22. — Kinderhook Limestone ; Iowa. 
Hdodus carbomrhts, Newberry & Worthen, op. cit. vol. ii. p. 75, 
pi. iv. fig. 20. — Coal-Measures ; Illinois. 
Helodus compnssus, Newbcriy & Worthen, op. cit. vol. iv. (18i0), 
p. 360, pi. iii. fig. 15. — Burlington Limestone ; Illinois. 
[Aon Newberry & TVortbon, op. cit. vol. ii. p. <8, pi. v. 
fig. 1, — see llijhodadodus compressus, p. 29.J 
Helodus eoniculus, Newberry & Worthen, op. cit. vol. ii. p- 75, 
pi. iv. fig. 19; J. S. Newberry, Ann. Hop. Geol. Surv. 
Indiana, 1879, p. 344. — Keokuk Limestone ; Illinois. 8t. 
Louis Limestone ; Indiana. Burlington Limestone ; Iowa. 
Helodus consolidatus, Newberry & Worthen, op. cit. vol. ii. p. 87, 
pi. vi. figs. 1 , 2. — Keokuk Limestone ; Missouri and Illinois. 
Helodus crenulatus, Newberry & Worthen, op. cit. vol. ii. p. 82, 
pi. v. fig. 7. — Keokuk Limestone ; Illinois. 
Helodus dens-liumani, Newberry & W’orlhen, oj>. cit. vol. ii. 
p. 76, pi. iv. fig. 21. — Keokuk Limestone: Illinois. 
Helodus dcnticulatus, Newberry & W orthen, op. cit. vol. ii. p. 81, 
pi. V. fig. 6. Helodus (1) denticidatus, St. John& W-orthen, 
Pal. Illinois, vol. vi. (1875), p. 317.— Keokuk Lime- 
stone ; Illinois. 
Helodus elytra, Newberry & Worthen, op. cit. vol. ii. p. /8, pi. iv. 
fig. 23. — Keokuk Limestone ; Illinois. 
Helodus yihhus, J. Leidy, Trans. Amor. Phil. Soc. [2] vol. xi. 
(1857), p. 88, pi. V. fig. 18.— Carboniferous Limestone ; 
Illinois. 
Helodus liEvis, J. 8. Newberry, Ann. Hep. Geol. Surv. Indiana, 
1876-78 (1879), p. 343.— St. Louis Limestone ; Indiana. 
Helodus limeuv, Newberry & Worthen, op. cit. vol. ii. p. 80, pi. 
fig. 5. — Burlington Limestone ; Iowa. 
