80 CARBONIFEROUS ENTOMOSTRACA. 



25. Cytherella Richteriana. Sp. nov. Plate VII, figs. 4 a — e. 



These Devonian specimens, from the so-called " Cypridinen-Schiefer " of Saalfeld, 

 were given to us by Prof. Dr. R. Richter some years ago. Pressure may have 

 modified the outlines somewhat, and rendered figs. 4 a and 4 d more ovate than the 

 oval specimen fig. 4 c. The profiles of two different valves give a central convexity. The 

 characteristic flange of the left valve is shown in fig. 4 e. Taking them together, as 

 showing probable variations of form in an old and much squeezed rock, we call them C. 

 Richteriana, after our well-known friend, the assiduous palaeontologist of Saalfeld. They 

 are related apparently to C. simplex (PI. VII, fig. 3), but they have not the ellipticity, 

 nor the relative convexity, of that form. On account of their similarity to C. simplex 

 we include these Devonian specimens in our Monograph, remembering also that the 

 " Devonian " Fauna and Flora are closely related to those of the " Carboniferous " period, 

 mm. mm. mm. mm. Proportions. 



Length -96 l'O 1-08 '7 . 24 25 27 17$. 



Height 7 -68 ? -48 . 17$ 17 ? 12. 



Thickness -44 ? -72 ? . 11 ? 18 ? 



Besides the localities mentioned with the foregoing descriptions of Carboniferous 

 Cytherella we have noted the following in Scotland as yielding species of simple forms, 

 such as C. Benniei, C. recta, and C. simplex, but not yet determined. In the collection 

 of the Geological Survey of Scotland: — Ponfeigh Burn, near Douglas ('Cat. W.-Scot. 

 Foss.,' p. 77) j Climpy Limestone, near Climpy, Wiisontown (ib., p. 92) ; Mountain- 

 blaw, Wiisontown ; Hillhead quarry, Wiisontown (ib., p. 74) ; Limekilns, old quarry 

 adjoining Limekilns House, near East Kilbride, Lanarkshire, from shale between 

 limestones Nos. 1 and 2 of the Calderwood series (ib., p. 80) ; Whitefield, old quarry, 

 Peeblesshire ; and shales of the Calciferous Sandstone series, north of New Castleton, 

 Roxburghshire. In 1871 Mr. John Henderson, of Edinburgh, noticed one or more 

 Cytherella: in the strata on the west side of Craig-Lockhart Hill, three miles south of the 

 village of Currie, Pentland Hills. 



