76 



CARBONIFEROUS ENTOMOSTRACA. 



edge and symmetrically curved on the other; but not sufficiently characterised for a 

 name. 



Length '44; height "26; thickness ? mm. Proportions 22 : 13 : ?. 

 Erom the Mountain-limestone Shale of Wyebourne, near Penrith, Cumberland. 

 Collected by Mr. Bland. 



15. Cytherblla (?). Sp. Plate VII, tigs. 13 a — c. 



Of several casts, seemingly belonging to CytherellcB, and obtained by the late Mr. 

 Grossart (of Salsburg, near Holytovi^n) from the Lower Carboniferous Beds, six feet 

 above the Eurypterus Limestone of Lanarkshire, w^e here figure side-views of two valves 

 and a profile of another. There is much variation as to ellipticity and marginal contour 

 among the specimens, and no special character to enable us, after full consideration, 

 to come to a definite conclusion as to the aUiance of these carapace-valves. They seem 

 to be closely related to C. valida, page 70. We have some like them from the 

 Carboniferous Limestone of Belgium and elsewhere. 



mm. mm. Proportions. 



Length 1-28 1-2 . 32 30. 



Height -68 '72 17 18. 



Thickness -4 ? . 10 ? 



IG. Cytherella ? ROTUNDATA. Sp. uov. Plate VII, figs. 15 a — c. 



Carapace broad-elliptical, uniformly convex, with greatest convexity central. Profile 

 narrow-oval ; end-view subovate. Specimens not well preserved ; some apparently 

 plunctate. 



Length -64; height '5; thickness '34 mm. Proportions 32 : 25 -. 17. 



Collected by the Geological Survey of Scotland, at Mayfield Quarry, near Dalkeith. 

 A specimen rather more ovate than fig. 15 «, and faintly punctate, was collected by 

 Mr. D. Robertson, in the Lower Limestone Series, at Burnbank, Carluke.^ 



If this be a Cytherella, which is doubtful, it differs much from any common style of 

 the genus, belonging, as it does, to Group I, B, punctate, not cuneiform. 



17. Cytherella scrobiculata. Sp. nov. Plate VI, figs. 10 a — e. 



Carapace oval-oblong, broad (high), and stout, ends nearly equal, but somewhat vari- 

 able. Profile narrow-ovate. Pit of the muscle-spot often visible. Surface ornamented 



' 'Cat. W.-Scot. Foss.,' p. 71. 



