30 TKILOBITA. 



Paradoxides, Murch. 1837, Sil. Syst. ; Milne-Edw. 1840, Crust, iii. p. 343. 

 Ar(/es, Goldfuss, 1843, Neiies Jahrbuch, p. 544; Portlock, 1843, Geol. 



Kep. 1. 

 Amphion, Portlock, 1843, Geol. Kept. 1. 

 Ceraurus, M'Coy, 1849, Ann. & Mag. Nat. Hist. p. 408. 

 SphcBrexochiis, Salter, 1849, Mem. Geol. Surv. vol. ii. pt. 1. 

 Cyrtometopm, Ang-eliu, 1855, Pahieont. Suec. 

 Eccuptochile, Salter, 1864, Mon. Pal. Soc. pt. 1. 

 Distribution. Cambrian, Silurian, Devonian. 



Cheirurus (Crotalocephalus) articulatus, Miinst. 1840. Middle 



Devonian Limestone of Lammaton, Torquay. 

 Calymene articulata, Miinst. Beitrage, 1840, vol. iii. pi. v. fig. 7. 

 C. Stemhen/ii, Phillips, 1841, Pal. Foss. tig. 247 ; Burm. 1846, Organ. Trilob. 



2nd edit.' p. 116. 

 Cheirurus articulatus, Salter, 1853, Decade vii. Geol. Surv. pi. i. art. 1, p. 10 ; 

 id. 1864, Mon. Pal. Soc. pt. 1, p. 01, pi. vi. figs. 7, 8. 



Cheirurus bimucronatus, Murch. 1837. Caradoc and Llaudoverj^ Rocks, 



Wales and Ireland ; May Hill Sandstone, 

 Norbury ; Wcnlock Limestone and Shales, 

 Ludlow Piocks. 



Paradoxides himncronatus, Murch. 1837, Sil. Syst. pi. xiv. figs. 8, 9. 

 Cheirurus insignis, Barrande, 1852, Sil. Syst. Boheme, pi. xii. figs. 1-13. 

 C. speeiosus, Salter, Mem. Geol. Surv. vol. ii. pt. 1 , pi. vii. figs. 4, 5, 6. 

 a Williamsii, M'Coy, 1849, Ann. & Mag. Nat. Hist. p. 408 ; M'Coy, 1851, 



Pal. Foss. Woodw. Mus. pi. i. F. fig. 13. 

 C.himucronatus, Salter, 1864, Mon. Pal. Soc. pt. 1, p. 6.3, pis. v. & vi. ; Salter, 



Decade vii. Geol. Surv. pi. ii. ; Salter, 1866, Mem. Geol. Sm-v. vol. iii. 



p. 323, pi. xviii. figs. 4-6, var. fig. 7. 



Var. CI. Mmucronatus, Salter, 1864, Mon. Pal. Soc. pt. 1, p. 64, pi. vi. 



figs. 1.5-17. 

 Yar. /3. centralis, Salter, 1864, op. cit. pi. vi. figs. 9-14 & fig. 18. 



Cheirurus cancrurus, Salter, 1853, Caradoc Limestone, Ireland. 



Cheirurus gelasinosus, M'Coy (not of Portlock), 1846, Synop. Sil. Foss. Ireland, 



p. 44. 

 C. cancrurus, Salter, 1853, Dec. Geol. Surv. no. 7, art. 2, pi. 11. 

 C. cancrurus, Salter, 1859, Siluria, 2ud edit. p. 538 ; id. 1864, Mon. Pal. Soc. 



pt. l,pl. V. figs. 15 (& 16?). 



Cheirurus (Eccoptochile) Frederici, n. sp., 1864. Upper Tremadoc 



Slates, Garth Hill and Portmadoc. 

 Cheirurus Frederici, Salter, Mem. Genl. Surv. vol. v. (ined.)pl. viii. figs. 1-3. 

 Eccuptocliile Frederici, Salter, 1864, Mou. Pal. Soc. pt. 1, pi. v. figs. 18-21. 

 Cheirurus Frederici, id. 1866, Mem. Geol. Surv. vol. iii. p. 322, pi. viii. figs. 

 1-3, woodcut 10. 



Cheirurus gelasinosus, Portlock, 1843. Caradoc, Tyrone, Ayrshire, 



and Craig Head Limestone. 

 Amphion gelasinosus, Portlock, 1843, Geol. Rep. t. iii. fig. 4. 

 Arges planospiiiosus, id. ibid. t. v. fig. 9. 



Cheirurus gelasinosus, Salter, 1851, Quart, Geol. Journ. vol. vii.pl. viii. fig. 1 ; 

 Salter, 1853, Decade vii. Geol. Surv. art. 2, p. 11; Salter, 1859, Siluria. 

 2nd edit. p. 538 ; Salter, 1846, Mon. Pal. Soc. pt. 1, pi. v. figs. 6-8. 



