48 
SELACHII. 
Surgery, vol. ii. (1874) p. 537, figs, xxvii, xxviii.—Coal- 
Measures ; Northumberland. 
Petalodus parvulus : Antliodus parvulus , Newberry & Worthen, 
op. cit. vol. ii. p. 38, pi. ii. fig. 7.—Burlington and Keokuk 
Limestones ; Illinois. 
Petalodus proximus, St. John & Worthen, tom. cit. p. 395, pi. xii. 
fig. 11.—Upper Coal-Measures ; Illinois. 
Antliodus cucullus, Newberry & Worthen, op. cit. vol. ii. (1866), 
p. 41, pi. iii. fig. 1.—Keokuk Limestone; Illinois. 
Antliodus gracilis , St. John & Wortheu, op. cit. vol. vi. (1875), 
p. 393, pi. xi. fig. 29.—Warsaw Beds; Illinois. 
Antliodus minutus , Newberry & Worthen, op. cit. vol. ii. p. 43, 
pi. iii. fig. 3 : J. S. Newberry, Ann. Rep. Geol. Surv. 
Indiana, 1879, p. 341.—Keokuk Limestone, Illinois; St. 
Louis Limestone, Indiana. ? Also A. minutus, L. G. de 
Koninek, Faune Calc. Carbf. Belg. pt. i. (1878), p. 52, 
pi. vi. fig. 9.—Lower Carboniferous Limestone (Bed Je); 
Tournai, Belgium. 
Antliodus mucronatus, Newberry & Worthen, op. cit. vol. ii. p. 38, 
pi. ii. fig. 6.—St. Louis Limestone; Illinois. 
Antliodus perovalis, St. John & Worthen, op. cit. vol. vi. p. 393, 
pi. xi. fig. 28.—Warsaw Beds; Illinois. 
Antliodus politus , Newberry & Worthen, op. cit. vol. ii. p. 42, 
pi. iii. fig. 2.—Keokuk Limestone ; Illinois. 
Antliodus robustus , Newberry & Worthen, op. cit. vol. ii. p. 39, 
pi. ii. fig. 9.—Chester Limestone; Illinois. 
Antliodus similis, Newberry & Worthen, op. cit. vol. ii. p. 41, 
pi. ii. fig. 10. ?Also J. S. Newberry, Ann. Rep. Geol. 
Surv. Indiana, 1879, p. 346.—Keokuk Limestone; Illinois, 
(?) Indiana. 
Antliodus simplex, Newberry & Worthen, op. cit. vol. ii. p. 44, 
pi. iii. fig. 4.—Burlington Limestone; Iowa. 
Antliodus sulcatus , Newberry & Worthen, op. cit. vol. ii. p. 45, 
pi. iii. fig. 5.—Keokuk Limestone ; Illinois. 
Chomatodus affinis , Newberry & Worthen, op. cit. vol. ii. p. 54, 
pi. iii. fig. 15.—Keokuk Limestone ; Illinois. 
Chomatodus angularis, Newberry & Worthen, op. cit. vol. ii. p. 55, 
pi. iii. fig. 16.—Coal-Measures; Illinois. 
Chomatodus cultellus , Newberry & Worthen, op. cit. vol. ii. p. 52, 
pi. iii. fig. 13.—Chester Limestone; Illinois. 
Chomatodus gracillimus, Newberry & Worthen, op. cit. vol. ii. p. 51, 
pi. iii. fig. 12.—Burlington Limestone; Iowa. 
Chomatodus insignis (Leidy), St. John & Worthen, op. cit. vol. vi. 
pi. x. a. fig. 5 : (?) Palccobatis insignis, J. Leidy, Trans. Amer. 
