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 orbiculakis. 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 



1 ' Bullet. Acad. Roy. Belgique,' ser. 2, vol. xv, p. 110. 



