CHIROCKNTRIDJ!. 
Ill 
&c., Dresden, 1868, p. 43, pi. ii. figs. 24, 25, pi. iii. 
figs. 5-18, 20-22, pi. iv. figs. 6, 7 ; A. Fritsch, llept. u. 
Fische biihm. Kreideform. (1878), p. 44, fig. 06 ; (?) 0. D. 
Romanovsky, Material. Geol. Turkestansk. Kraya [in 
ltussian], pt. iii. (1890), p. 121, pi. xvii. fig. 0. — Turonian : 
Saxony and Bohemia; (?) Turkestan. [Dresden Museum.] 
Cladocyclus sweeti, A. S. Woodward, Ann. Mag. Nat. Hist. [6] 
vol. xiv. (1894), p. 445, pi. x. figs. 2-6. — Cretaceous 
(Rolling Downs Formation) ; Queensland. [Collection of 
George Sweet, Esq., Melbourne.] 
Genus SAURODON, Hays. 
[Trans. Amer. Phil. Soc. n. s. vol. iii. 1830, p. 475.] 
Syn. Daptinus, E. D. Cope, Proc. Acad. Nat. Sci. Philad. 1873, p. 339. 
Teeth hollow, in deep sockets, compressed to a sharp edge in 
front and behind ; those of the maxilla, as also those of the dentary, 
almost uniform, only slightly increasing in size backwards, and 
those of the premaxilla not much enlarged ; the inner margin of 
each dental alveolus deeply notched. A small toothless presym- 
physial bone in the mandible. Vertebra as in Iehthyodectes and 
Chirocentrites. 
The identity of the so-called Daptinus with this genus was deter- 
mined by Cope after an examination of the type specimen of 
Saurodon leanus (Bull. U.S. Geol. Surv. lerrit. vol. iii. 187/, 
p. 588). 
Saurodon leanus, Hays. 
1830. Saurodon leanus, I. Hays, Trans. Amer. Phil. Soc. u. s. vol. iii. 
p. 476, pi. xvi. 
1857. Saurocephalus leanus, J. Leidy, Trans. Amer. Phil. Soc. n. s. 
vol. xi. p. 91, pi. vi. figs. 12-15. 
1877. Saurodon leanus, E. D. Cope, Bull. U.S. Geol. Surv. Territ. 
vol. iii. p. 588. 
Type. Imperfect jaws ; National Museum, Washington. 
The type species, with upper jaw about 0‘07 or 0-08 in length. 
Dental crowns smooth, as deep as broad, with the sharp edges 
convex or slightly sinuous and the apex sometimes curved back- 
wards ; about 9 or 10 dental alveoli in the premaxilla, about 36 in 
the maxilla, and about 42 in the dentary. Length of oral border 
of premaxilla about three quarters its depth ; length of oral border 
of maxilla about twice its maximum depth. 
Form, ff Loc. Upper Cretaceous : Pensauken Creek, New Jersey. 
Not represented in the Collection. 
