70 



CARBONIFEROUS ENTOMOSTRACA. 



1. Cytherella valida, Sp. nov. Plate VI, figs. 2 a — c. 



Carapace rather large, ovate or suboblong, with unequally round ends, oblique on the 

 front edge, neatly semicircular behind ; compressed ; rather more convex and somewhat 

 narrower (lower) behind. Valves stout, smooth. 



Length 1-4; height "8; thickness -56 mm. Proportions 35 : 20 : 14. 



From the Mountain-limestone series at Calees, in East Cumberland. Collected by 

 the Rev. Waher Howchin, F.G.S. 



Some casts from near Carluke, collected by the late Mr. Grossart, PI. VII, figs. ISa, 

 b, c, somewhat approach C. valida in size and outline. 



2. Cytherella Benniei, sp. nov. Plate VI, figs. 3 a, h ; ^ a, h ; ^ a, b ; 1 a,b ; and 



Plate VII, figs. 12 a—d. 



Carapace mostly small, suboblong, rather variable, but higher (broader) behind than 

 in front ; edge-view sublanceolate, thickest in the posterior third, but slightly varying in 

 individuals. Surface smooth. 



mm. mm. Proportions. 

 Length 1-04 '8 . 26 20 



Height -64 -4 . 16 10 



Thickness -48 -32 . 12 8 



Fig. 3, from the Hosie Limestone, at the head of Mouse water,^ Wilson town, 

 Lanarkshire, was collected by Mr. Bennie for the Geological Survey of Scotland, 



Figs. 4 and 5, from the Carboniferous Limestone, Calderside, near High Blantyre,^ were 

 collected by Mr. John Young, F.G.S. Fig. 4 is rather more parallel-edged than the other. 



Fig. 7, from the Carboniferous Limestone series (upper) of Kennoway Den, in Fife, is 

 larger than the other examples of this species.^ 



1 ' Catal. W.-Scot. Fossils,' 1876, p. 92. The geology of the Western Scotland is succinctly given 

 by J. Armstrong, John Young, D. Robertson, and Dr. J. Young, in this valuable little book, which is an 

 improved form of the Supplement of vol. iii, 'Trans. Geol. Soc. Glasgow,' 18/1. 



^ 'Catalogue of the Western-Scottish Fossils,' 1876, p. 68. 



^ We have examples of great ditference in size among individuals of one species, from the Carboniferous 

 Rocks, in the various representatives of Leperditia Okeni, from the Mountain-limestone and the Coal- 

 measures. In the present case a larger variety than those here referred to is seen in the var. lowensis, 

 pi. vii, fig. 17, p. 80. 



