48 DEVONIAN FAUNA. 



1. PoLTCOPE SIMPLEX, JouBs and Kirlchy. Plate IV, figs. 8 a, 8 6, 8 c. 



1871. PoLTCOPE SIMPLEX, Jones and Kirkhy. Trans. Geol. Soc. Glasgow, vol. iii, 



Suppl., p. 26 ; and 1874, Monogr. 

 Brit. Carb. Entom., pt. 1, pi. ii, 

 figs. 1, 10, 12 (not pi. V, fig. 1 ?). 



Description. — A unique specimen from Lummaton very closely approaches the 

 figures given by Messrs. Jones and Kirkby of this Carboniferous species. In these 

 figures the antero-ventral sinus is not so concave as in the little fossil under notice. 

 In its relative convexity it approaches fig. 10 of the Monograph more than the 

 others, and it is rather blunter posteriorly than any of them. 



Size. — 5 mm. 



Locality. — Lummaton. 



2. PoLYCOPE Devonioa, Joncs. Plate IV, figs. 7 a, 7 h, 7 c, and 9. 



P1874. PoLTCOPE SIMPLEX (pars), Jones and Kirkhy. Mon. Brit. Carb. Entom., 



pt. 1, pp. 55, 56, pi. V, figs. 1 a — d (only). 

 1881. — Devonica, Jones. Geol. Mag., dec. 2, vol. viii, p. 340, pi. ix, 



figs. 4 a, h, c. 

 1888. — — Etheridge. Eoss. Brit., vol. i. Pal., pt. 1, p. 430. 



Description. — Carapace bivalved, oval, very convex. Margins of the valves 

 rising almost perpendicularly from the edges, and then arching rather suddenly 

 over the centre. Curvature of the anterior and posterior edges much greater 

 than that of the dorsal and ventral edges. Surface minutely and obscurely 

 punctate. 



The specimen shown in fig. 7 has a rather more elliptic form than the type 

 specimen, fig. 9, and difiers from it slightly in convexity. The mark in its front 

 extremity appears to be only an accidental crack due to pressure. If, however, 

 this mark is not merely a breakage, the nearest published figure would be Cylin- 

 droleheris (Asterope) teres^ and it would then have to be removed from the genus 

 Polycope. 



Size. — 5 mm. 



Locality. — Lummaton. 



3. Polycope Devonica, var. major. Plate IV, figs. 13 a, 13 h, 13 c. 



Description. — Valve ovately oblong, almost uuiformly convex, bending down 

 steeply at the margins, especially in the posterior and the dorsal directions. 



^ 1868, Brady, ' Trans. Linn. Soc.,' vol. xxvi, p. 465, pi. xxxiii, figs. 6 — 9. 



