24 CARBONIFEROUS ENTOMOSTRACA. 



describe, namely, C. Maccoyiana, Burrovii, Monitor, and vomer, have the ventral margin, 

 for the most part, less convex, and sometimes nearly flat, with a strongly projecting 

 prow. 



5. Cypridinella Maccoyiana. Sp. nov. Plate III, figs. 13 a, b. 



Carapace subglobose ; suboblong in side-view ; cm^ed on the dorsal margin ; bluntly 

 apiculate, with a curved indentation, at the posterior angle ; notched high up in front, 

 with the lower portion of the anterior margin curving boldly outwards and downwards to 

 meet the nearly straight, but somewhat sinuous, ventral border. Neither valve has an 

 elevated tubercle, but the right valve is slightly more convex than the other in the specimen. 



Length \ ; height \ ; thickness ^^ inch. Proportions 9:6:4. 



This smaller species imitates C. dausa in some features, but not nearly enough to be 

 taken for its young state. In the notch and front margin also they differ considerably. 

 C. Maccoyiana is known by several shells and casts in the grey limestone of Little Island, 

 Cork ; collected by J. Wright, Esq., E.G.S. 



We name this species after Prof. E. M'Coy, F.G.S., of Melbourne, who has brought 

 very many genera and species of the Carboniferous Eossils of Ireland to notice, besides 

 working extensively in other fields of Palaeontology. 



6. Cypridinella Monitor. Sp. nov. Plate III, figs. 1 a, b. 



Carapace subpyriform, boldly curved above and below, but most convex above ; 

 bluntly apiculate low down behind ; sharply pointed in the prow-like antero-inferior 

 projection ; front sloping downwards and outwards from the dorsum to the prow, with a 

 hollow curve, and having a small notch and beak above the middle line. At the posterior 

 angle, in some specimens from Settle, there is the indication of the base of a posterior 

 spine ; and in some casts a small fissure exists between the valves, with a subtriangular 

 stone core, which has reference to the former existence at this spot of a hollow projecting 

 angle of the carapace-valves, such as occurs in several Bivalve Entomostraca, and among 

 the Cypridince especially noticeable in the recent C. Bairdii, Brady, and the fossil 

 C. Koninckiana (Bosquet). 



Length ^; height \ ; thickness f inch. Proportions 15 : 11 : 13. 



The prow of this compact carapace forcibly reminds us of the modern iron-clad 

 mastless men-of-war typified by the American "Monitor." 



Our figured specimen is from Vise, Belgium, thanks to our friend M. J. Bosquet, of 

 Maestricht. It is a white cast, with a film of w^hite shell here and there. Similar casts 



