42 



CARBONIFEROUS ENTOMOSTRACA. 



VII. BRADYCINETUS, G. 0. Bars. 



Cypeidina, Baird, 1850. 



— Liljeborg, 1853. 

 AsTEROPE, Fischer, 1854. 

 Cypridina, Stimpson, 1854. 

 Bradycinetus, G. 0. Sars, 1865. 



— G. S. Brady, 1867, 1868, 1871. 



Carapace strong, ovato-globose ; deeply notched ; edge of the beak sinuous, or even 

 produced into small horn -like processes. See page 9. 



1. Bradycinetus Rankinianus, /. a7id K. Plate II, figs. 21, 22 a — c. Plate V, fig. 5. 



» Cypridina Rankiniana, J. and K., 1867. Trans. Geol. Soc. Glasgow, vol. ii, p. 218 ; 



and vol. iii, Suppl., 1871, p. 27. 



Carapace globose ; compressed anteriorly, round-oval or broad-ovate in outline ; deeply 

 notched in front, beneath a broad beak, which has a jagged or sinuous edge (fig. 5, PI. V). 



The surface is smooth and finely reticulate (fig. 22, c), with irregularly quadrangular 

 meshes, slightly sunken at the centre. The Muscle-spot, distinct on the cast (fig 21), is 

 almost central. 



Two specimens of this interesting species occur in the half of a small round ironstone 

 nodule from Gare, Carluke : from the same stratum that yielded the Coprolite with 

 Tolycope simplex (p. 53), equivalent to the " First Calmy Limestone of Braid wood," 340 

 fathoms below the Ell Coal. In Dr. Rankin's Collection. 



The nodule is seven eighths of an inch in greatest diameter ; beneath its external 

 coat (one sixth of an inch) is a thin layer of calc-spar, next a film of ironstone, and the 

 i Inside consists of a blue argillaceous septarium, one fissure of which passes through 

 one of the specimens. 



Bradycinetus Bankinianus is like B. Macandrei (Baird), Brady, ' Trans. Lin. Soc.,' 

 vol. xxvi, plate 37, figs. 14 — 17, in general aspect, but is more gibbose and more oval in 

 outline ; but it is not truncate behind, nor is there evidence of its having been spined at 

 tlie postero-ventral region. It has a notch and beak closely resembling those of B. 

 Macandrei ; and, though B. Brenda has a somewhat diflferent structure of these parts 

 we refer our fossil to this genus, guided by the peculiarity of beak, general contour, 

 and ornament. It is dedicated to the indefatigable explorer of Carluke fossils, Dr. D. 

 R. Rankin, who has aided us kindly with many specimens. 



Length \; height \; thickness -§■ inch. Proportions 12 : 9 : 6. 



