28 
SELACHTI. 
figs. 24, 25.—Carboniferous Limestone; Government of 
Toula, Russia. 
(?) LopJiodus reticulcitus, J. W. Davis, Trans, Roy. Dublin Soc. [2] 
yoI. i. (1883), p. 407, pi. li. fig. 22 ; Quart. Journ. Geol. 
Soc. vol. xl. (1884), p. 626, pi. xxvii. fig. 2.—Yoredale 
Hocks; Wensleydale, Yorkshire. 
Lophodus sinuosus, J. W. Davis, Trans. Roy. Dublin Soc. [2] 
vol. i. (1883), p. 409, pi. li. fig. 28.—Upper Carboniferous 
Limestone; Yorkshire. 
Ghomatodus angustus, J. S. Newberry, Ann. Rep. Geol. Surv. 
Indiana, 1876-78 (1879), p. 342.—St. Louis Limestone; 
Indiana. __ 
Ghomatodus arcuatus, 0. St. John, Proc. Amer. Phil. Soc. vol. xi. 
(1870), p. 435, and in Hayden’s Final Rep. Geol. Surv. 
Nebraska (1872), p. 243, pi. vi. fig. 14 ; St. John & 
Worthen, Pal. Illinois, vol. vi. (1875), pi. x. fig. 23.— 
Upper Coal-Measures ; Nebraska and Iowa. 
Ghomatodus chesterensis , St. John & Worthen, Pal. Illinois, vol. vi. 
(1875), p. 363, pi. x. figs. 15-17.—Chester Limestone; 
Illinois. 
Ghomatodus comptus, St. John & Worthen, op. cit. vol. vi. p. 356, 
pi. x. figs. 19-22.—Rurlington Limestone; Iowa. 
Ghomatodus elegans, Newberry & Worthen, op. cit. vol. ii. p. 86, 
pi. v. fig. 18.—Keokuk Limestone; Iowa. 
(?) Ghomatodus inconstans, St. John & Worthen, op. cit. vol. vi. 
p. 360, pi. x. figs. 5-14.—St. Louis Limestone; Iowa. 
Ghomatodus obliquus, J. S. Newberry, loc. cit. p. 342.—St. Louis 
Limestone; Indiana. 
Ghomatodus obscurus , J. Leid} T , Trans. Amer. Phil. Soc. [2] vol. xi. 
(1860), p. 89, pi. v. figs. 22, 23.—Carboniferous Lime¬ 
stone ; Illinois. \Tanaodus, St. John & Worthen.] 
Ghomatodus selliformis, J. S. Newberry, loc. cit. p. 341.—St. 
Louis Limestone, Illinois. 
Ghomatodus varsouviensis , St. John & Worthen, op. cit. vol. vi. 
p. 363, pi. x. figs. 1-4.—Warsaw Limestone; Illinois 
and Missouri. 
Venustodus argutus, St. John & Worthen, op. cit. vol. vi. p. 352, 
pi. ix. figs. 5, 6.—Chester Limestone; Illinois. 
Venustodus leidyi, St. John & Worthen, op. cit. vol. vi. p. 350, 
pi. ix. figs. 1-4 : Ghomatodus venustus, J. Leidy, Trans. 
Amer. Phil. Soc. [2] vol. xi. (1857), p. 89, pi. v. figs. 19- 
21.—St. Louis Limestone ; Illinois and Missouri. 
Venustodus robustus , St. John & Worthen, op. cit. vol. vi. p. 345, 
pi. ix. figs. 15-18.—Burlington Limestone ; Iowa. 
