52 DEVONIAN FAUNA. 



its posterior moiety more elevated, compared with the anterior, and its posterior 

 end wider and more rounded. It was first described by Prof. Rupert Jones in 

 1861, in the ' Memoirs of the Geol. Survey of Scotland,' and in 1876 similar 

 specimens from Australia were referred by Prof, de Koninck to E. pelagica, Barr., 

 which had been described from Bohemia in 1872. In his paper in the ' Annals and 

 Magazine of Natural History,' above referred to, Prof. Rupert Jones supports this 

 identification, but retains the earlier name, E. tuherosa. Having examined the 

 specimens now under description, he agrees with Mr. Roberts and myself in 

 regarding them as distinct from his species,^ which, though often deformed by 

 pressure, is always recognisable. 



Among the Bntomides described in the last-mentioned paper, two other species 

 may be compared with the specimens from Lummaton. (1) E. remformis 

 (Kolmodin) is nearly semicircular, and its evenly convex valves are only half 

 divided by the furrow, at the umbilical end of which is an obscure tubercle. 

 (2) E. Angelini, Jones, is much larger, and is much less convex on one side of the 

 furrow than on the other, although it shows no tubercle. E. Lindstroemi, Jones ,^ 

 agrees with the form under notice in its narrow, flattened, mid-dorsal area, whence 

 the furrow arises ; but it differs as to shape and convexity and in other particulars. 

 E. amygdaloides, Tschernyschew,^ is much more elongate, is flatter, and has a 

 more oblique furrow. None of the Bntomides described by Jones and Kirkby in 

 the ' Monograph on British Carboniferous Entomostraca ' (Palseont. Soc), Part I, 

 at all resemble the present species. 



IV. Family— GYV^O^miDM, Fam. nov. 



The easily distinguished genus Cyprosina requires, in the opinion of Prof. 

 Rupert Jones, to be placed in a distinct family, the characters of which are in 

 general the same as of the genus founded by him in the ' Geol. Mag.' of August, 

 1881. Especial importance is to be attached to the ventral furrow as a distinctive 



' The following synonymy of E. tuherosa has been furnished me by Prof. Eupert Jones : 



1861. Entomis tubeeosa, Jones. Mem. Geol. Surv. Scotland, Explan. Map 32, 



p. 137, pi. ii, fig. 5. 



1873. — — — Ann. Mag. Nat. Hist., ser. 4, vol. xi, p. 415. 



1884. — — — Ibid., ser. 5, vol. xiv, p. 391, pi. xv, fig. 1. 



1872. — PELAGICA, Barr. Syst. Sil. Bohem., vol. i, SuppL, p. 515, pi. xxiv, 



figs. 1—6. 



1876. — — Be Kon. Foss. Pal. Nov. Galles du Sud., p. 49. 



2 1888, Jones, ' Ann. Mag. Nat. Hist.,' ser. 6, vol. i, p. 407, pi. xxii, fig. 16. 

 2 1885, Tschernyschew, 'Mem. Com. Geol. Russ.,' vol. iii, pt. 1, p. 84, pi. 1, fig. 1. 



