38 



CARBONIFEROUS ENTOMOSTRACA. 



Koninck's somewhat exaggerated curve (in his fig. 6 c) is not without meaning in the 

 representation of the curious Daphnioid hood, as shown also in his fig. 6 a. The 

 structure of sinus and gape there clearly shown appears to be unique, and waits for 

 elucidation. 



1. Cyprella chrysalidea, De Koninck. Plate IV, figs. 10 a — c; 11 a — c ; 14 a, b, 

 16, 16 a — c ; 1'^ a, b. Including Var. subannulata. 



^ Cyprella chrysalidea, Be Koninck, 1844. Mem. Acad. Roy. Belgique, vol. xiv, 



p. 19, fig. 7; 1843, in D'Omalius' 

 Precis elem. Geo!., p. 515 ; 1844, 

 Desc. Anim. foss. Terr. Carb. Belg., 

 p. 589, pi. lii, fig. 6 a — e. 

 — ' — Dupont, 1863. Bull. Acad. Roy. Belg., ser. 2e, vol. xv, p. 110. 



— ■ — Jones and Kirkby,\SM. N. Jahrb. f., 1864, p. 54; Can. 



Nat. Geol., June, 1864, p. 237. 

 — SUBANNULATA, Jones, 1870. M. Microsc. Journ., vol. iv, p. 185, pi. 61, 



fig. 10. 



Carapace compressed-egg-shaped ; subovate in outline, sharp behind ; truncate and 

 notched, or somewhat rounded and notched, in front ; bearing subcentral tubercles of 

 greater or less extent and elevation ; surface marked with numerous vertically transverse, 

 parallel strise or furrows, or rather step-like graduated rings, like the body-rings of a 

 chrysalis. These vary in number in our specimens; fig. 10 has only seven from behind 

 up to the tubercle, and none beyond, over the anterior quarters of the shell ; fig. 11 has 

 ten or more on the posterior, and none on the anterior half of the shell ; fig. 16 shows 

 about fourteen over the whole length of the valve, and they are strongly marked as in 

 fig. 10 ; fig. 18 also has about fourteen, as in fig 16, whilst figs. 14 and 15 have about 

 fifteen or sixteen ; and the still more perfect Belgian specimen, figured by Prof. De 

 Koninck, has eighteen or more clearly indicated from tail to hood. 



The Belgian casts with which M. Bosquet has favoured us are sketched in figs. 14, 

 15, and 18, and though somewhat crushed and imperfect, they show the general features 

 clearly enough [fig. 18 « ought to indicate a trace of the tubercle]. Like them, though 

 not quite so large, is a well-preserved grey shell (fig. 16) in grey limestone from 

 Settle, Yorkshire (Mr. J. H. Burrow), fully satisfying palaeontologists of the existence 

 of the Belgian species in the British area during the Lower Carboniferous Period. It 

 has a rounded hood, low-set notch, and feeble tubercle, but we hesitate to regard these 

 differences as of specific value. 



In fig. 10 we exhibit another but smaller specimen ; a grey shell, in grey limestone, 

 from Settle (Mr. Burrow). It is like the others, except that the beak is relatively stronger 



