68 EtJRYPTERlDA. 



Pterygotus minor, H, Woodw, 1864. Old Ked Sandstone, Farnell 



by Brechin. 

 Pten/ffofus minor, H. Woodw. Geol. Mag. 18G4, vol. i. p. 199, pi. x. fig. 2 ; 

 id. Mou. Pal. Soc. 1866, Merostomata, pt. 1, p. 35, pi. i. fig. 4. 



Pterygotus problematicus, Agassiz, 1839. U. Ludlow Rock, 



WhitclifFe, Ludlow, &c., Kendal (Westmoreland), &c. 

 Pterygotus prohlematicus, Agassiz, in Sil. Syst. (1839), p. 606, pi. iv. figs. 4, 5; 

 Salter, 1852, Quart. Jonrn. Geol. Soc. vol. viii. pi. xxi. figs. 1, 2 ; id. Siluria, 

 3rd edit. pi. xix. figs. 4-6; id. 1859, Mem. Geol. Surv. monograpli i. p. 89, 

 pis. xii. & xix. ; H. Woodw. 1872, Mod. Pal. Soc. Merostomata, pt. 3, p. 85, 

 woodcnt fig. 20; Salter, 1873, Cat. Camb. & Sil. Foss. p. 188. 



Pterygotus raniceps, H. Woodw. 1868. U. Silurian Eocks, 



Lanarkshire. 

 Pterygotus raniceps, H, Woodw. 1868, Quart. Joum. Geol. Soc. vol. xxiv. 

 p. 294, pi. ix. fig. 3 ; id. 1872, Mon. Pal. Soc. Merostomata, pt. 3, p. 71, 

 pi. xvi. fig. 1. 



Pterygotus stylops, Salter, 1859. Downton Sandstone, Kington, 



Herefordshire. 

 Pterygotus (?) stylops, Salter, Mem. Geol. Surv. Mon. i. 1859, p. 55, pi. xii. 

 fig. 47; H. Woodw. 1872, Mon. Pal. Soc. Merostomata, pt. 3, p. 91, wood- 

 cut fig. 24. 



Pterygotus, sp., Salter, 1873. Silurian, Benson's Knott. 



Pterygotus, sp., Salter, 1873, Cat. Camb. & Sil. Foss. p. 179. 



Pterygotus taurinus, Salter, 1868. Lower Old Eed, or Ledbury 



Shales formation, Ewyas Harold, Abergavenny. 

 Pterygotus taurinus, Salter, 1868, Brit. Assoc. Rep. Sect. p. 78 ; H. Woodw. 

 1872, Mon. Pal. Soc. Merostomata, pt. 3, pp. 75, 76, woodcut fig. 14. 



SLIMONIA, D. Page, 1856. 



Himantopterus, Salter, 1856, Quart. Journ. Geol. Soc. vol. xii. p. 29; 



D. Page, 1859, Advanced Text-book, 2nd edit. p. 163. 

 Pterygotus, Salter, 1859, Mem. Geol. Surv. mon. i. p. 57. 

 Slimonia, D. Page, 1856, Advanced Text-book, p. 135; H. Woodw. 1872, 

 Mon. Pal. Soc. Merostomata, pt. 3, p! 105. 

 Distrihctimi. Upper Silurian. 



Slimonia acuminata, Salter, sp., 1856. U. Ludlow Rock, 



Lesmahagow, Lanarkshire. 

 Himantopterus acuminata, Salter, 1856, Quart. Journ. Geol. Soc. vol. xii. 



p. 29, fig. 4 ; D. Page, 1859, Advanced Text-book, 2nd edit. p. 163, figs, a, b, 



p. 169, fig. 2. 

 H. maximus, Salter, 1856, Quart. Journ. Geol. Soc. vol. xii. p. 28, tig. 3. 

 I^erygotus acuminata, Salter, 1859, Mem. Geol. Surv. mon. i. p. 57, pL ii., 



pi. xiii. figs. 1-4, pi. XV. fig. 1. 

 Slimonia acuminata, D. Pa<ie, 1856, Advanced Text-book, p. 135, fig. 3; 



H. Woodw. 1863, Intellectual Observer, vol. iv. p. 229, plate ; id. 1872, 



Mon. Pal. Soc. Merostomata, pt. 3, p. 105, pis. xvii.-xx. ; Salter, 1873, Cat. 



Camb. & Sil. Foss. p. 179, and woodcut. 



STYLONURUS, Page, 1855. 



Stylonurus, Page, 1855, Biit. Assoc. Pep. p. 89 ; H. Woodw. 1865, Quart. 



Journ. Geol. Soc. vol. xxi. p. 486. 

 Eurypterus, Salter, 1857, Ediub. New Phil. Journ. vol. vi. p. 257. 

 Distribution. Sihirian and Old Red Sandstone. 



