106 TRILOBITES OF GIRVAN. 



furrows. The surface of the body is coarsely punctate, but the border is striated 

 parallel to its edge. 



Affinities. — This form appears to belong to the section Metopolichas. The 

 elongation of the bicomposite lobes at the expense of the fourth lateral lobes, 

 which are almost crowded out, is noteworthy. The shape of the central lobe of 

 the glabella, the long bicomposite lobes almost extending to the occipital furrow, 

 the shape and size of the fixed cheeks, the position of the eyes, the tuberculate 

 border, and the occipital furrow resemble L. marginatus, Lindstrom, 1 from the 

 Silurian of Gotland ; but the bicomposite lobes in the Girvan form are longer, and 

 occipital lobes are also present, while in the imperfect specimens figured as the 

 types of the Gotland species, occipital lobes seem to be wanting. The head of 

 L. affinis, Angelin, 2 in these two respects bears much resemblance to the Girvan 

 specimen. The hypostome, which I have tentatively attributed to this form, is 

 much like that of L. amis, Barrande. 3 



Collection. — Mrs. Gray. 



Horizon and Locality. — Saugh Hill Group (M. Llandovery) : Woodland Point. 



0. Lichas (Amphilichas hibernicus (Portlock), 1843. Plate XV, figs. 1—3. 



1843. Nuttainia Mhernica, Portlock, G-eol. Rep. Londond., p. 274, pi. iv, figs. 1 a — d, pi. v, figs. 1 — 3. 



— Nuttainia hibernica, Morris, Cat. Brit. Foss., p. 75. 

 1815. Lichas hibernica, Beyrich, Ueb. Bohm. Trilob., pp. 25, 29. 

 1846. Lichas hibernica, M'Coy, Synops. Silur. Foss. Ireland, p. 51. 



1878. Lichas sp., Etheridge, jun., Proc. Roy. Pliys. Soc. Edinb., vol. iv, p. 169. 



— Lichas hibernicus, Nicholson and Etheridge, Mon. Silur. Foss. Girvan, fasc. i, p. 133, pi. ix, 

 figs. 9, 10. 



? 1885. Lichas holmi, Schmidt, Rev. Ostbalt. Silur. Trilob., pt. ii, p. 54, pi. vi, figs. 14—17. 



1896. Lichas hibernicus, Reed, Quart. Journ. Geol. Soc, vol. Hi, p. 428. 



? 1902. Lichas (Metalichas) hibernicus, Reed, Quart. Journ. Geol. Soc, vol. lviii, p. 74, fig. 7. 



— Lichas (Paralichas) kildarensis, Reed, ibid., p. 80. 



Specific Characters. — Head-shield transversely semicircular ; free cheeks un- 

 known. Middle shield strongly convex from back to front and from side to side, 

 bent down anteriorly. Glabella subquadrate, rounded, broader than long, strongly 

 convex, bent down in front; composed of a median lobe and a single pair of tri- 

 composite lateral lobes. Median lobe with independent convexity, bent down for 

 anterior half, club-shaped, expanded transversely in front to quite twice or more 



1 Lindstrom, ' Forteckn. Gotl. Silur. Crust.' (Ofv. k. vet. Akad. Forhandl., No. 6 [1885]), p. 58, 

 pi. xiv, figs. 8, 9. 



2 Angelin, ' Pal. Scand.,' p. 69, pi. xxxviii, fig. 4 ; Tornquist, ' Undersokn. Siljans. Trilobit.,' p. 33, 

 pi. i, fig. 31. 



3 Barrande, ' Syst. Silur. Boheme,' vol. i, Suppl., pi. vi, fig. 25 ; pi. x, fig. 14. 



* The name Amphilichas has been proposed by Raymond (' Amer. Journ. Sci.,' vol. xix, 1905, 

 p. 378) in place of Paralichas, the latter being pre-occupied. 



