52 



CARBONIFEROUS ENTOMOSTRACA. 



Carboniferous Limestone of the Isle of Man (' Quart. Journ. Geol. Soc.,' vol. ii, pp. 322; 

 and 'Isle of Man,' p. 355). 



At Vise, in Belgium, it is not rare in the white Carboniferous Limestone (De 

 Koninck, Bosquet, Dupont^). 



2. Entomoconchus orbicularis. Sp, nov. Plate I, figs. 7 a — c. 



Carapace suborbicular and compressed; one half inch long ; vertical and longitudinal 

 diameters nearly equal ; transverse diameter (through both valves) rather more than half 

 of either of the former; notch faint; antero-ventral keel strong. Side-view almost 

 orbicular ; truncate in front, and slightly contracted in the postero-ventral region. End- 

 view acute oval, lenticular. Edge-view acute oval, lenticular. 



Transverse, vertical, and longitudinal diameters as 8 : 14^ : 15. 



One shell, much eaten away by weathering, collected by Mr. Joseph Wright, E.G.S., 

 at Little Island, Cork ; and in a specimen of the grey Carboniferous Limestone of 

 Poolvash, sent to us from the Isle of Man by Mr. E. W. Binney, F.R.S., we find the cast 

 of a small compressed Entomoconchus probably referable to this species. 



3. Entomoconchus globosus. Sp. nov. Plate V, figs. 10 a—g. 



Carapace globular, its length shghtly exceeding its height or thickness, which are equal. 

 Profiles nearly orbicular. Side-view faintly elliptical. Edge-view suboval. End-view 

 round, with a slight ventral flattening. 



The " beak " is more distinct than in either Entomoconchus ^couleri or E. orbicularis, 

 and the lower portion of the " gape " is continued much further into the ventral region 

 than in either of the other two species. The breast-angle is wanting in E. globosus ; the 

 hinder margin is well rounded, and bears a trace of a submedian spine. 



The Muscle-spot is of the usual type and very distinct. The surface of the valve 

 exhibits also some traces of reticular structure or ornament. 



Length \; height f; thickness f inch. Proportions 16 : 13 : 13. 



Only one valve is known ; from the Lower Limestone Series of West Broadstone, 

 Beith, Ayrshire. Collected by Mr. John Young. 



4. Entomoconchus. Sp. nov. ? 



In the British Museum is a rather small Belgian Entomoconchus from the Carboni- 

 ferous Limestone of Vise, which has the general characters of E. globosus, with the 



^ ' Bullet. Acad. Roy. Belgique,' ser. 2, vol. xv, p. 1 10. 



