I 
CLADODONTIDiE. 27 
Genus PHQIBODUS, St. John & Worthen. 
[Pal. Illinois, vol. vi. 1875, p. 251.] 
Syn. Bathycheihdiu, St. John & Worthen, Pal. Illinois, vol. vi. 1876, 
p. 252. 
Teeth very similar to those of Cladodus, but having the outer 
lateral cones as large as, or larger than, the median cone. Inter- 
mediate cones, one, two, or three in number, very small. 
Fhabodui soj>hi<e, St. John & Worthen, tom. cit. p. 251, pi. i. 
fig. 14. — Middle Devonian ; Iowa. 
PJwebodus madsaacmi: Baihycheilodug meisaacsii, St. John & 
Worthen, tom. cit. p. 252, pi. i. figs. 12, 13. — Middle 
Devonian ; Iowa. 
Phoebodus sprinyeri'^ : Pristicladodus springeri, St. John & Wor- 
then, tom. cit. p. 255, pi. i. figs. 7-11. — Kinderhook 
Limestone ; Iowa. 
Genus LAlMBDOCXJSy St. John <fe Worthen. 
[Pal. Illinois, vol. vi. 1875, p. 280.] 
Teeth small, similar to those of Cladodus, but destitute of lateral 
cones. 
Lamhdodus calceolus, St. John & Worthen, tom. cit. p. 281, pi. v. 
fig- 5. — Burlington Limestone ; Iowa, Illinois. 
Lamhdodus costatus, St. John & Worthen, tom. cit. p. 280, pi. v. 
fig. 3. — Burlington and Keokuk Limestones ; Iowa, Illinois, 
Missouri. 
Lamhdodus hamulus, St. John & Worthen, tom. cit. p. 283, pi. v. 
tig. 26. — Chester Limestone ; Illinois. 
Lamhdodus rejlexus, St. John & Worthen, tom. cit. p. 284, pi. v. 
fig. 25. — Chester Limestone ; Illiuois. 
Lamhdodus robustus, St. John & Worthen, tom. cit. p. 282, pi. v. 
fig- 6. — Keokuk Limek one ; Iowa, Illinois, Missouri. 
Lamhdodus transversus, St. John & Worthen, tom. cit. p. 282, 
pi- V. fig. 4.— St. Louis Limestone; Illinois. 
> S. Garman (BuU. Mus. Comp. Zool. Harvard Coll. vol. xii. no. 1, 1885, 
p. 6) proposes the generic name of Ptemodus for this species. This, however, 
seems unnecessary, and the term has already been occupied by B. Owen (Trans. 
Odontol. Soc. 1867) for a supposed Carboniferous genus. 
