154 TRILOBITES OF GIRVAN. 



Family Phacopih.e. 



Genus PHACOPS, Emmrich. 



1. Phacops (Pterygometopus) brongniarti, Portlock, 1848. Plate XIX, figs. 



17, 18. 



1843. Phacops brongniarti, Portlock, Geol. Eep. Loudond., p. 282, pi. ii, fig. 8. 



— Phacops murchisoni, Portlock, ibid. pi. ii, fig. 9. 



— Phacops dalmani, Portlock, ibid, pi. ii, fig. 7. 



1853. Phacops brongniarti, Salter, Mem. G-eol. Surv., dec. vii, art. 1, p. 10. 



1864 Phacops (Acaste) brongniarti, Salter, Mon. Brit, Trilob , p. 34, pi. i, figs. 20—24 ( $ ) ■ pi. i. 

 figs. 25, 26 ( <? = Ph. dalmani). 



1875. Phacops brongniarti, Baily, Char. Brit. Foss., p. 41, pi. xiii, figs. 11, a, b, c, 



1876. Phacops brongniarti, Armstrong and Young, Cat. West, Scot. Foss., p. 16. 



— Phacops dalmannii, Armstrong aud Young, ibid., p. 16. 



1877. Phacops (Acaste) brongniarti, Woodward, Cat, Brit, Foss. Crust., p. 50. 



1878. Phacops (Acaste) brongniarti, Nicholson and Etheridge (e. p.), Mon. Silur. Foss. Girvan, fasc. i, 

 p. 99, pi. vii, fig. 1 (non fig. 2). 



1879. Phacops (Acaste) brongniarti, Nicholson and Etheridge, ibid., fasc. ii, p. 201, pi. xiv, figs. 7, 8. 

 1899. Phacops brongniarti. Reed, Quart. Journ. Geol. Soc, vol. lv, p. 749. 



— Phacops brongniarti, Mem. Geol. Surv, Silur. Rocks Brit., vol. i, Scotland, pp. 490, 500, 505, etc. 

 1905. Phacops (Pterygometopus) brongniarti, Reed, Geol. Mag. [5], vol. ii, p. 227. 



Remarks. — This well-marked species is especially characteristic of tlie Balclatchie 

 Group, but seems to occur also on a lower aud on a higher horizon. Its characters 

 have been too often described to need repetition here. It has been referred 

 by me (loc. cit., 1905) to the genus or subgenus Pterygometopus. 



Gollectvms. — Mrs. Gray; Edinburgh Museum (f. M., pi. xiv, fig. 7) ; Museum of 

 Practical Geology (f. M., pi. vii, fig. 1); Woodwardian [Sedgwick] Museum. 



Horizons and Localities. — ? Stinchar Limestone Group (Llandeilo) : Minuntion. 

 Balclatchie Group (Llandeilo) : Ardmillan Brae ; Dow Hill ; Balclatchie. ? Drum- 

 muck Group (II. Bala) : Drummuck ; ? Starfish Bed, Thraive Glen. 



. Phacops (Phacopidella) elegans (Sars & Boeck), 1838. Plate XIX, 



19—23. 



1833. Trilobites elliptifrons, Esmark, Mag. f. Naturvid., ser. 2, vol. i, p. 269, pi. vii, figs. 6, 7. 



1838. Trilobites elegans, Sars and Boeck in Keilhaus' Gaea Norvegica, p. 139. 



1851. Phacops stokesi, Salter, Quart, Journ. Geol. Soc, vol. vii, p. 171, pi. ix, figs. 2a, 2b. 



1852. Phacops quadrilineata, Angelin, Pal. Scand., p. 12, pi. ix, fig. 5. 



1857. Phacops stokesi, Kicszkowslii, Archiv Naturk. Liv.-, Est,-, Kurl., ser. i, vol. i, p. 530. 



