44 TRILOHITA. 



MICRODISCUS, Emmons, 1842. 



Microdlscus, Emmons, Geol. New York, vol. i. p. IIG; Salter, 1SG4, Quart. 

 Journ. Geol. Soc. vol. xx. p. 237 ; Hicks, 1871, Quart. Journ. Geol. Soc. 

 vol. xxvii. p. 400. 

 Distribution. Cambrian. 



Microdiscus punctatus, Salter, 1864. Lower Lingula-EIags, 



^orth-y-Rhaw, St. David's, S. Wales. 



Microdiscus jnmctatus, Salter, 1864, Quart. Jonrn. Geol. Soc. vol. xx. p. 237, 

 pi. xiii. fig. 11. 



Microdiscus sculptus, Hicks, 1871. Longmynd Eocks, Nun's AYell, 



St. David's. 

 Microdiscus sculptns, Hicks, 1871, Quart. Journ. Geol. Soc. vol. xxvii. p. 400, 

 pi. xvi. figs. 9, 10. 



NESEUEETUS, Hicks, 1872. 



Neseuretus, Hicks, 1872, Quart. Journ. Geol. Soc. vol. xxix. p. 45. 

 Distribution. Cambrian. 



Neseuretus ? elongatus, Hicks, 1872. Tremadoc Eocks, 



Eamsey Island, Tremanhire. 

 Neseuretus ? elongatus, Hicks, 1872, Quart. Journ. Geol. Soc. vol. xxix. p. 45, 

 pi. iii. figs. 1-3. 



Neseuretus ? elongatus, var. obesa. Hicks, 1872, Quart. Journ. Geol. 

 Soc. vol. xxix. pi. iii. tig. 4. 



Neseuretus quadratus. Hicks, 1872. Tremadoc Eocks, 



Eamsey Island and Tremanliire. 

 Neseuretus quadratus, Hicks, 1872, Quart. Journ. Geol. Soc. vol. xxix. p. 45, 

 pi. iii. figs. 11-13 & 23-26. 



Neseuretus Ramseyensis, Hicks, 1872. Tremadoc Eocks, 



Ramsey Island and Tremanhire, near St. David's. 



Neseuretus Raviseyonsis, Hicks, 1872, Quart. Journ. Geol. Soc. vol. xxix. p. 44, 

 pi. iii. figs. 7-10 & 16-22. 



Neseuretus recurvatus, Hicks, 1872. Tremadoc Eocks, 



Eamsey Island and Tremanhire. 

 Neseuretus recurvatus, Hicks, 1872, Quart. Journ. Geol. Soc. vol. xxLx. p. 45, 

 pi. iii. figs. 5, 6. 



NIOBE, Angelin, 1852. 



Niohe, Angelin, 1852 ; Salter, 1866, Mem. Geol. Surv. vol. iii. p. 314. 

 Distribution. Cambrian. 



Niobe Homfrayi, Salter, 1866. Upper Cambrian, Lower Tremadoc 



Slates : Penmorfa church, Tremadoc ; Castle Deudraeth, 



near Maentwrog, N. Wales. 



Niobe Homfrayi, Salter, App. Ramsay Geol. N. Wales ; id. 1866, Mem. Geol. 



.Surv. vol. iii. p. 314, pi. vi. figs. 6-S ; id. 1866, Mon. Pal. Soc. pt. 3, p. 143, 



pi. XX. figs. 3-12 : id. 1872, Cat. Camb. & Sil. Foss. p. 15. 



