60 TEILOBITA. 



Stygina, sp., Salter, 1866. Caradoc. Sholes Hole, Haverfordwest. 



Stygina, sp., 1866, Salter, :\Ion. Tal. Soc. pt. 3, woodcut 40, p. 174. 



TRINUCLEUS, Lhwyd, 169S. 



Xiittmnia, Eaton, 1832, Geol. Text-boob. 



Trimicleus, Portlock, 18.34, Rep. Geol. Tyrone ; Murch. 18-39, Sil. Svst. ; 



Milne-Edw. 1840, Crust, vol. iii. p. 331': M'Coy. ISol, Pal. Foss.Wobdw. 



Mus. ; Salter, 1853, Geol. Surv. Decade vii. ; Hicks, 1876, Quart. Joum. 



Geol. Soc. vol. xxxii. p. 13o. 

 Tretmpis, >['Cot, 1851, Pal. Foss. Woodw. Mus. 

 Distribution. Upper Cambrian and Lower Silurian. 



Trinucleus concentricus, Eaton, sp., 1S32. Upper LlandoTery, 



Shropshire ; Caradoc, Britain. 

 Nuttainia concentrica, Eaton, 1832, Geol. Text-book, pi. i. fig. 2 : Salter, 1866, 

 Mem. Geol. Surv. vol. iii. p. 320, pi. xix. tig. 4 : Salter, 1873, Cat. Camb. & 

 Sil. Foss. p. 49. 

 N. Caracfaci, Murch. 1839, Sil. Syst. pi. xxiii. fig. 1. 



Trinucleus concentricus, var. a. Goldfussii, Barrande. lS-53. Dandeilo, 

 Caradoc and Bala Eocks, X. it S. Wales and Ireland. 



Trinucleus Sternhergii, Salter, 1847, Quart. Journ. Geol. Soc. vol. iii. p. 253. 

 T. Goldfussii, Salter, 1853, Geol. Surv. Decade vii. 



Trinucleus conceutricus, var. p. Caractaci. Murch. 1S39. Bala Piocks, 



Welshpool and X. Wales. 

 Trinucleus concentricus, var. /3. Caractaci, Murch. 1839, Sil. Syst. pL v. fig. 1 ; 

 Salter, 1853, Geol. Surv. Decade vii. 



Trinucleus concentricus, var. y. elongatus, Portlock. 1S34. LlandeHo 



Flags, Pembrokeshire. 

 Trimicleus concentricus, var. y. elongatus. Portlock, 1834, Rep. Geol. Londond. 

 & Tyrone, pi. i. B. tig. 7 ; Salter, 1853, Geol. Surv. Decade vii. 



Trinucleus concentricus, var. e. Portlockii, Salter, 1553. Caradoc, 



Tyrone, Desertcreat. 

 Tnmicleus Caractaci, Portlock, 18.34, Rep. Geol. Londond. & Tvrone, pi. i. B. 

 T. latu-s, Portlock, 1834. Rep. Geol. Londond. & Tyrone, pi. i. B. 

 T. concentricus, var. e. Portlockii, Salter, 1853, Geol. Surv. Decade vii. 



Trinucleus Etheridgi, Hicks, lS7o. Upper Arenig, Llanvirn Quarry. 



Trinucleus Etheridgi, Hicks, 1875, Quart. Joum. Geol. Soc. vol. xxxi. p. 82, 

 pi. ix. fig. 0. 



Trinucleus favus, Salter, 1866. Upper LlandeUo, X. and S. Wales. 



Trinucleus gihhifrons k T. Caractaci, M'Coy, 18-51, Pal. Foss. Woodvr. Mus. 



(in part ) pp. 144, 145. 

 T. concentricus, var. 6. favus, Salter, Mem. Geol. Surv. vol. ii. pt. 1, pi. ix. 



fig. 3, & Decade vii. pi. vii. 

 T. favus, Salter, 1866, Mem. Geol. Surv. vol. iii. p. 320. pi. xiii. fig. 9 ; Salter, 



1873, Cat. Camb. & SH. Foss. p. 81. 



