50 



CARBONIFEROUS ENTOMOSTRACA. 



Entomoconchus Scouleri, Jones, 1870, Monthly Microsc. Journ., vol. iv, p. 185, 



pi. Ixi, fig. 17. 



Carapace subglobose, with a subquadrilateral profile ; more strongly arched on the 

 dorsal than on the ventral border ; truncate in front, with slight notch, depressed area, 

 and narrow interrupted gape, as described above (p. 46). 



Individuals differ one from another in the profiles of their several aspects, as side-view, 

 end-view, and edge-view, and when some agree in one profile they differ in others. Some 

 (as figs. 2, 3, and 5), which are fuller in the postero-dorsal region than others (figs. 4 

 and 6), may have been females. 



The diversity of outlines leads us to treat of the selected specimens separately, 

 thus : 



PI. I, figs. 1 a — c. — The cast of a varietal form, and probably a small male, from the 

 Carboniferous Limestone of Clonalvy, near Naul, Co. Meath, Ireland.^ It is -^ths of an 

 inch long. Side-view obliquely ovate ; truncated obliquely in front, having its longest 

 diameter from the antero-dorsal angle to the postero-ventral curve. End-view ovate, 

 broadest downwards. Edge-view long-ovate, broadest anteriorly. The transverse 

 (through the valves), vertical, and longitudinal diameters are as 5 : 6 : 7. 



This specimen indicates a carapace proportionately longer, more convex below, and 

 more depressed in the postero-dorsal region (the last being probably a masculine feature), 

 than the other oblique-ovate specimens (figs. 4 and 6), and it differs also from them some- 

 what in the profiles both of end and edge. Hence we regard it as a variety — Far. 



OVALIS. 



Figs. 2 a — d. — This is a yellowish-grey shell of probably a young female E. Scouleri, 

 one third of an inch long. It is from the Lower Scar Limestone of Settle, Yorkshire 

 (Mr. J. H. Burrow, M.A.). Side-view subquadrate, ■ with the postero-ventral region 

 rather prominent and the dorsal wall rounded. End-view ovate, broadest below. Edge- 

 view long-ovate, broadest in front. 



The diameters have the following proportions : — Transverse (thickness of the whole 

 carapace) as 8 ; vertical as 11 ; longitudinal as 13. 



We have the same form from the Carboniferous Limestone of BoUand,^ Yorkshire 

 (Prof. Morris, F.G.S.), and of Vise, Belgium (M. Bosquet, C.M.G.S.). 



Figs. 3 a — d. — This is a rather large specimen, consisting of a light-grey limestone 

 cast and a piece of cream-coloured shell, from Vise, Belgium ; the gift of M. J. 

 Bosquet, For. Cor. G. S., of Maestricht. It corresponds with De Koninck's figured 

 specimen in size, but slightly differs in outline. It is ^-Qths inch in length. Side-view 



' Geo). Survey Ireland Museum, Tablet 211 N. Referred to in 'Ann. Nat. Hist.,' ser. 3, vol. xviii, 

 p. 48. 



- This is the "Bowland Forest " of some maps, &c. — J. P. 



