ENTOMIS. 



87 



front, and deeply impressed with the dorsal (nuchal) sulcus, slightly in front of the 

 centre. The posterior moiety bears about eleven vertical, somewhat sinuous, parallel 

 riblets, curving forwards along the ventral region, and fading out forwards as they slope 

 upwards over the anterior portion of the valve. The hinder moiety is rather larger than 

 the other. 



Length 6-25 ; height 3'75 ; thickness 3-5 mm. Proportions 25 : 15 : 14. 



This, one of the best of the excellent specimens collected by the late Mr. J. H. 

 Burrow at Settle, we named in 1874 (Explanation of Plate IV) in compliment to him, 

 and we regret that in consequence of his death we have now to regard it only as a 

 memorial of his enthusiastic attachment to geology. 



4, Entomis Koninckiana. Sp. nov. Plate IV, figs. 20 a — c. 



This well-marked Entomis is oblong, with unequal ends, a deep medial sulcus, and 

 comparatively few but distinct costulge. There are about six, vertical and parallel on the 

 posterior half, some of which curve along the ventral region, and slope up thence towards 

 the antero-dorsal margin (imperfect in this specimen). The front moiety of the valve 

 is rather more convex than the other. 



Length 5*25 ; height 3; thickness 3 mm. Proportions 21 : 12 : 12. 



This is a light-grey valve in the whitish limestone of Settle, West Yorkshire, and as 

 it is well worthy of distinction we dedicate it to our esteemed friend, the eminent and 

 veteran palaeontologist. Prof. Dr. L. de Koninck, who first recognised and described 

 many of the Entomostraca of this interesting group in the Carboniferous Limestone of 

 Belgium. 



5. Entomis obscura. Sp. nov. Plate IV, figs. 19 a — </, 24. 



Fig. 19 represents a smooth but weathered or partly dissolved valve, grey like its 

 matrix of limestone, from Cork, Ireland. Its surface is not so distinctly reticulate as the 

 figure appears to be. The valve is oblong, rounded anteriorly, and somewhat obliquely 

 truncate behind. It has a sub medial dorsal furrow, and a large tubercle on the front 

 half, but the hinder moiety is rather larger and more convex than the other. 



Length 6*25 ; height 3'75; thickness 3*25 mm. Proportions 25 : 15 : 13. 



Pig. 24 is drawn from a ferruginous internal cast of a similar Entomis^ in grey 

 limestone from Settle, West Yorkshire. It is not well preserved, the ventral margin 

 being damaged. 



This differs sufficiently from other known forms to be regarded as distinct. On 

 account, however, of its rather feeble characterisation we have termed it E. obscura. 



