REMOPLEURIDES SALTER!. 39 



18G9. Remopleurides dorsospinifer, Linnarsson, Vestergotl. Oamb. Silur. Ailagr., p. 68, pi. i, figs. 

 23—25. 



1877. Remopleurides dorsospinifer, Woodward, Cat. Brit. Foss. Crust., p. 57. 



1878. Cheirurus sp. ind., Nicholson and Etheridge, Mon. Silur. Foss. Girvan, fasc. i, p. 107, pi. vii, 

 ■ fig. 18. 



1884. Remopleurides dorsospinifer, Tornquist, TJndersokn. Siljans. Trilobf., p. 38 (Sver. Geol. 

 Undersokn., ser. C, No. 66). 



Ti<' marls. — The chief features which distinguish this species from the other 

 common Girvan forms are the long* narrow slowly tapering axis with the long 

 dorsal spine on the eighth ring, and the relatively wide pleural portions of the thorax 

 (see Salter, op. cit., 1853). The long genal spines to the head-shield and the 

 rather narrow unfnrrowed glabella are likewise characters which are noticeable. 

 Nicholson and Etheridge figure a specimen belonging apparently to this species 

 as Cheirwns sp. ind., and state that it was obtained from Drnmmuck, but Mrs. Gray 

 has labelled it Balclatchie, which is much more probably correct, and the litho- 

 logical character of the specimen agrees with that of the Llandeilo beds of 

 Balclatchie. 



Collection.— Mrs. Gray (f. M.). 



Horizon a nd Localities. — Balclatchie Group (Llandeilo): Dow Hill ; Balclatchie. 



6. Remopleurides longicostatus, Portlock, 1843. Plate VI, fig. 7. 



1843. Remopleurides longicostatus, Portlock, Geol. Rep. Londond., p. 257, pi. i, fi<>\ 6. 



? — Remopleurides longicapiiatus, Portlock, ibid., p. 257, pi. i, fig. 5. 



1853. Remopleurides longicostatus, Salter, Mem. Geol. Surv., p. 9, dec. vii, pi. viii. 



1854. Remopleurides longicostatus, Morris, Cat. Brit. Foss., 2nd ed., p. 115. 

 1877. Remopleurides longicostatus, Woodward, Cat. Brit. Foss. Crust., p. 58. 

 1896. Remopleurides longicostatus, Reed, Quart. Journ. Geol. Soc, vol. lii., p. 410. 



Remarks.- — -The shortness of the eyes, the broad base and wide but short anterior 

 tongue to the glabella, the absence of furrows on the surface, the wide neck ring, 

 and the straight horizontal occipital furrow are characters which mark this 

 species. One of the glabellas from Dow Hill measures 15 mm. in width across 

 the middle, 10 mm. at the base, and is 12*5 mm. long. Portlock's type specimen, 

 with which I have compared them, shows the distinguishing features well. 



Collection. — Mrs. Gray. 



Horizon and Locality. — Balclatchie Group (Llandeilo) : Dow Hill. 



7. Remopleurides salteri, Reed, var. girvanensis, nov. Plate VI, figs. 8 — 15. 



1879. Remopleurides laterispinifer, Nicholson and Etheridge, Mon. Silur. Foss. Girvan, fasc. ii, p. 149, 



pi. x, fig. 11, (? fig. 10) ; pi. xi, fig. 15. 

 1899. Remopleurides laterispinifer, Mem. Geol. Surv., Silur. Rocks Brit., vol. i. Scotland, pp. 490,500,509. 



