COCHLIODONTrELE. 227 
Hdodus mons-canus, H. Trautschold, Nouv. Mem. Soc. Imp. Nat. 
Moscou, vol. xiii. (1874), p. 288, pi. xxviii. fig. 2.— 
Carboniferous Limestone ; Mjatschkowa, Moscow. 
Hdodus placenta , Newberry & Worthen, op. cit. vol. ii. p. 80, 
pi. v. fig. 4.—Kinderhook Limestone ; Iowa. 
Hdodus politus, Newberry & Worthen, op. cit. vol. ii. p. 79, 
pi. v. fig. 2.—Keokuk Limestone; Illinois. 
Hdodus pusillus : Polyvhizodus pusillus, L. M‘Coy, Ann. Mag. 
Nat. Hist. [2] vol. ii. (1848), p. 126; and Brit. Palaeoz. 
Loss. (1855), p. 642, pi. 3 e, fig. 2.—Lower Carboni¬ 
ferous Limestone; Armagh. 
Helodus rugosus, Newberry & Worthen, op. cit. vol. iv. (1870), 
p. 359, pi. ii. fig. 10.—Coal-Measures; Illinois. 
Hdodus undulatus , Newberry & Worthen, op. cit. vol. ii. p. 82, 
pi. v. fig. 8.—Keokuk Limestone ; Illinois. 
Helodopsis abhrevicita , W. Waagen, Pal. Ind. [13] pt. i. (1879), 
p. 15, pi. i. fig. 6.—Productus Limestone; Salt Range, 
India. 
Helodopsis elongata , W. Waagen, loc. cit. p. 14, pi. i. figs. 3, 4.— 
Productus Limestone ; Salt Range. 
Lopliodus angular is, J. W. Davis, Quart. Journ. Geol. Soc. vol. xl. 
(1884), p. 628, pi. xxvii. fig. 25.—Yoredale Rocks; 
' AYensleydale, Yorkshire. 
Lopliodus contractus , L. G. de Koninck, Faune Calc. Carbf. Belg. 
pt. i. (1878), p. 33, pi. iv. figs. 4, 5. Helodus contractus , 
H. Trautschold, Nouv. Mem. Soc. Imp. Nat. Moscou, 
vol. xiii. (1874), p. 270, pi. xxvi. fig. 10 (misprinted 
E. angustus). —Carboniferous Limestone: Government of 
Toula, Russia, and Belgium. 
Lopliodus irregularis , H. Romanowsky, Bull. Soc. Imp. Nat. 
Moscou, 1864, pt. ii.p. 161, pi. iii. fig. 21.—Carboniferous 
Limestone ; Government of Toula. 
Lopliodus lanceolcitus, H. Romanowsky, tom . cit. p. 162, pi. iv. 
fig. 22 ; L. G. de Koninck, Faune Calc. Carbf. Belg. pt. i. 
(1878), p. 36, pi. iv. fig. 12.—Carboniferous Limestone; 
Government of Toula, Russia, and Belgium. 
Lopliodus levis , J. AY. Davis, Trans. Roy. Dublin Soc. [2] vol. i. 
(1883), p. 409, pi. Ii. figs. 26, 27; Quart. Journ. Geol. 
Soc. vol. xl. (1884\ p. 627.—Yoredale Rocks; Wensleydale. 
Lopliodus linearis , H. Romanowsky, tom. cit. p. 162, pi. iv. fig. 26. 
—Carboniferous Limestone ; Government of Toula. 
Lopliodus marginalis , H. Romanowsky, tom. cit. p. 161, pi. iii. 
fig. 20.—Carboniferous Limestone ; Government of Toula. 
Lopliodus margodentcitus , H. Romanowsky, tom. cit. p. 162, pi. iv. 
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