6 DEVONIAN FAUNA. 



Of American species, Ph. Logani, Hall 1 , has the central part of the basal furrow- 

 wider, the head is more rounded, and the tuberculation more distant. The eyelid 

 is also coarsely spotted, and there is a tendency to spines on the neck-lobe and the 

 angles. Ph. cristat a, Hall, 2 has a more anterior eye and spinous angles. Ph. rana, 

 Hall, 8 is finely and evenly granulated on the glabella and cheeks, and the glabella 

 does not overhang the border. The other species described by Hall appear to be 

 without granulations. 



2. Phacops latifrons (Bronn). PI. I, figs. 8, 8 a, 9. 



1825. Caltmene maceophthalma, Brongn. Pars. Crust. Foss., pi. i, fig. 5, a — c. 



1825. — latifrons, Bronn. Leonh, Zeitschr., p. 317, pi. ii, figs. 1, 2, 3. 



1833. — Lateeillii, Stein. Mem. Soc. Geol. Fr., vol. i, pt. 2, p. 351. 



1835. — maceophthalma, Bronn. Leth. Geog., p. Ill, pi. ix, fig. 4. 



1840. Lateeillii, Phill. Pal. Foss., p. 129, pi. lvi, fig. 249. 



1840. — accipeina, — Ibid., p. 128. 



1843. — ? Jobdani, F. A. Bom. Verst. Harz, p. 37, pi. xi, fig. 4. 



1843. Phacops macbophthalmus, Ooldf. Neues Jahrb., p. 564. 



1846. — latifbons, Burm. Trilobites, Kay Soc, p. 88, pi. ii, figs. 4—6. 



1850. — — Sandb. Verst. Ehein., p. 16, pi. i, fig. 7. 



? 1850. — — F. A. Bom. Beitr., pt. 1, p. 24, pi. ix, fig. 24 (= Ph. 



fecundus fide Kayser). 



1852. — — Quenstd. Handb., p. 289, pi. xxii, figs. 10—14. 



1853. — lateeillii, Stein. Geog. Beschr. Eifel, p. 87. 



1855. Pobtlockia latifbons, M'Coy. Desc. Brit. Pal. Foss., p. 177. 



1864. Phacops — Salter. Brit. Trilob., p. 18, pi. i, figs. 9—16. 



1864. — cbyptophthalmus, Salter. Brit. Trilob., p. 17, pi. 1, fig. 8. 



1876. — latifbons, F. Bom. Leth. Pal., pi. xxxi, fig. 2. 



1877. — — Barrois. Ann. Soc. Geol. du Nord, vol. iv, p. 86. 

 1882. — — — Recherches Ter. Anc. Asturies, p. 284. 



1884. — — Beushausen. Abhandlung. zur geol. Specialk. von 



Preuss., Band vi, pt. 1, p. 37. 



1885. — — Zittel. Handb., p. 614, fig. 811. 



1885. — — Biemann. Neues Jahrb., pt. 3, Beil.-Band, p. 146. 



1885. — — Barrois. Ann. Soc. Geol. du Nord, vol. xiii, p. 75. 



1887. — — Freeh. Zeitsch. der deut. geol. Gesell., p. 470. 



1888. — — Etheridge. Brit. Foss., pt. 1, p. 146. 



This well-known species was quoted by Phillips from Barton, and by Salter 

 from Newton, but in the first of these places it appears very rare, and it is possible 



1 1861, Hall, ' Pal. New York,' vol. iii, p. 353, pi. lxxiii, figs. 15—25 ; and 1888, Hall, vol. vii, 

 pi. viiiA, figs. 19,20. 



2 1861, Hall, ' Description of New Species, &c.,' p. 67 ; and 1888, Hall, ' Pal. New York,' vol. vii, 

 p. 14, pi. vi, figs. 1 — 13, 16 — 29, and pi. viii a, figs. 1 — 4. 



3 1861, Hall, 'Desc. New Species,' p. 55 ; and 1888, Hall, 'Pal. New York,' vol. vii, p. 19, pi. vii, 

 figs. 1 — 11, pi. viii, figs. 1 — 18, and pi. viii a, figs. 21 — 23. 



