56 TKILOBITA. 



Phillipsia quadrilimba, Phil, sp., 1836. Carb. Limestone, Bolland, 



Ireland. 

 Asaphus quadrilmihus, Phil. 1836, Geol. Yorks. vol. ii. p. 239, pi. xxii. 

 figs. 1, 2. 



PLACOPARIA, Corda, 1847. 



Placoparia, Corda, 1847, Men. der Bohm. Tril. p. 128 ; Hicks, 1875, Quart, 

 Journ. Geol. Soc. vol. xxxi. p. 187. 

 Distribution. Lower Silurian. 



Placoparia Cambriensis, Hicks, 1875. Upper Arenig, Llanvim Quarry 



(near Aber-eiddy). 

 Placoparia Cambriensis, Hicks, 1875, Quart. Journ. Geol. Soc. vol. xxxi. 

 p. 187, pi. ix. figs. 1, 2. 



PLUTONIA, Hicks, 1865. 



Plutonia, Hicks, 1868, Brit. Assoc. Rep. j Salter, 1873, Cat. Camb. & Sil. 



Foss. p. 2. 

 Distribution. Lower Cambrian. 



Plutonia Sedgwickii, Hicks, 1871. Longmynd Rocks, Nun's WeU, 



St. David's. 

 Plutonia Sedgioickii, Hicks, 1871, Quart. Journ. Geol. Soc. vol. xxvii. p. 399, 

 pi. XV. figs. 1-8. 



PROETUS, Steininger, 1830. 



Asaphus, Murch, 1839, Sil. Syst. 



Proettis, Murch. 1854, Siluria ; Salter, 1848, Mem. Geol. Surv. vol. ii. pt. 1, 



p. 337. 

 Forbesia, M'Ooy, 1855, Pal. Foss. p. 174. 

 Distribution. Upper Cambrian and Silurian. 



Proetus Fletcheri, Salter, 1873. Wenlock Limestone, Dudley. 



Proetus Fletcheri, Salter, 1873, Cat. Camb. & Sil. Foss. p. 134. 



Proetus latifrons, M'Coy, sp., 1846. Upper Silurian, Usk, 



Monmouthshire. 

 Forbesia latifrons, M'Coy, 1846, Sil. Foss. Ireland, pi. iv. fig. 11 ; M'Coy, 1855, 



Pal. Foss. p. 174. 

 Proetus latifrons, Salter, 1848, Mem. Geol. Surv. vol. ii. pt. 1, p. 337, pi. vi. 

 fig. 1 ; Salter, 1873, Cat. Camb. & Sil. Foss. pp. 134 & 165. 



Proetus Stokesii, Murch. 1839. Wenlock Limestone, Dudley, Ledbury, 



Herefordshire. 

 Asaiihus Stokesii, Murch. 1839, Sil. Syst. t. xiv. fig. 6. 

 Proetus Stokesii, Murch. 1854, Siluria, pi. xvii. fig. 7 ; Salter, 1873, Cat. Cam. 



& Sil. Foss. p. 134. 

 Forbesia Stokesii, M'Coy, 1855, Pal. Foss. p. 174. 



Proetus, sp., Salter, 1873. Upper Cambrian, Helms-Knot, Dent. 



Proetus, sp., Salter, 1873, Cat. Camb. & Sil. Foss. p. 78. 



