438 MM. Jones and Kirltby — Carboniferous Ostracoda. 



We name this form B. simplex. The full locality for it is " above 

 Karnshaugh, Longlee Ford, Warksburn, North Tynedale." 



Beyrichiella, gen. nov. 



There is another species (probably more than one) which comes 

 near those described above, but which has no fringe, although it 

 possesses a dorsal crest on each valve with a well-marked area be- 

 tween. It has a strong free-marginal overlap ; and is quite unisul- 

 cate. This may be regarded as typical of a new genus and species 

 under the name Beyrichiella cristata (PI. XII. Figs. 6a, 66). 



This form is abundant in some of the shales and cement- stones of 

 the Calciferous Sandstones in the East Neuk of Fife, — as at Eander- 

 stone and Billow Ness. 



Note on some Beyricbi.2e. 

 1. Beyrichia arcuata, Bean. PI. XII. Figs. 12 — 14. 



Cypris arcuata, Bean, 1836, Mag. of Nat. Hist. vol. ix. p. 377, woodcut, fig. 5fi. 



B. arcuata was figured roughly by Bean in 1836 ; but, for the 

 purpose of making comparison easy, we figure it here anew. It is 

 a well-known and characteristic species of the Coal-measures proper, 

 in some of the shales and ironstones of which it is found in great 

 numbers. 



It is comparatively large, being from -fa to iV of an inch in length ; 

 subovate in outline, with convex valves ; the dorsal margin is 

 straight, the ventral margin arched ; and the posterior end is the 

 smallest (lowest). A deep sulcus marks the anterior half of the 

 valves, and in front of it, close to the antero-dorsal angle, there is 

 often a small, nearly obsolete notch, more strongly marked on 

 internal casts. The valves are rimmed, and the surface is polished 

 and finely punctate. 



Among other localities, it occurs in Coal-measure strata at Ashby- 

 de-la-Zouch ; Agecroft Colliery near Manchester; Chesterfield; 

 Kyhope Colliery and Claxheugh near Sunderland ; and at Shotts 

 and Carluke in Lanarkshire. 



2. Beyrichia fastigiata, Jones and Kirkby. PI. XII. Figs. 8, 9, 10. 

 B. fastigiata, J. & K., 1867, Trans. Geol. Soc. of Glasgow, vol. ii. p. 220. 



This species is smaller and has the valves more broken up into 

 lobes than B. arcuata. Seen from above the outline is sub-cunei- 

 form, — widest behind, pointed in front. The surface is punctate. 



Length -gV of an inch. It was discovered by Mr. John Young, 

 F.G.S., of Glasgow. 



It occurs in the Carboniferous-Limestone series at Bathgate 

 (Linlithgowshire) ; Craigenglen, Campsie (Stirlingshire) ; Crossgate- 

 hall (Edinburghshire); East of St. Monans (Fifeshire) ; and in the 

 Calciferous-Sandstone series West of Billow Ness (Fifeshire). 



8. Beyrichia Bradyana, sp. nov. PI. XII. Fig. 11. 



B. Bradyana is a small subovate form, with the left valve strongly 

 overlapped by the right. It has a well-marked subcentral sulcus, 

 and in some specimens a fainter and smaller anterior impression, 

 with a roundish boss between. Seen from above, the outline is 



