CYPRIDELLA. 



35 



Length ^; height ^ ; thickness -g-inch. Proportions 11 : 8 ; 9. 



In this httle dark-coloured shell from the hmestone of Little Island, Cork (Mr. J. 

 Wright), and in a white cast from Vise (Bosquet), we have a near approach to Cypridella 

 cruciata, De Koninck (' Mem. Acad. Roy. Belg.,' vol. xiv, 1841, p. 20, fig. 11, and ' Descr. 

 Crust, foss. Terr. Carb. Belg.,' 1844, p. 590, pi. 52, figs. 7 a — e) from Vise. Our specimens, 

 however, are smaller, longer in proportion, more egg-shaped and tapering, have much larger 

 tubercles, less hood, and more gape apparently, and have decidedly far less of the furrow 

 across the back, which gives the cross-mark to Prof. De Koninck's species. 



To the energy and discrimination of Mr. Joseph Wright, P.G.S., of Belfast, we owe 

 the perfect specimen from Cork, and many other of the Entomostraca here described; 

 and we record our appreciation of his love of geology and his scientific liberality by 

 giving his name to this exquisite little fossil Cypridinad. 



M. de Koninck's C. cruciata is represented {loc. cit., fig. 7 a) by a right-hand valve, 

 with its front face upwards ; h is the anterior face, comparable with our fig.l c ; the fig. 7 d 

 shows the posterior extremity with the base of a spine, and e is the dorsal surface, 

 cross-marked by the hinge-line and transverse furrow. It is a rare species. Length 4 

 miUimetres. M. E. Dupont found it very rare in French Hainault, ' Bull. Acad. Belg.,' 

 ser. 2, vol. xv, 1863, p. 110. 



5. Cypridella quadrata. Sp. nov. Plate IV, figs. 2 a, h, c. 



Carapace quadrate in each profile, bearing a very prominent, globose, nearly central 

 tubercle on either side ; the front strongly hooded, and projecting below in a coarsely 

 trifid prow ; somewhat convex on the back ; almost straight and flat below ; rounded 

 behind, and bearing a mark of a spine at the postero-ventral angle ; transverse sulcus 

 (not shown in the figures) distinct on the back, and especially on the sides behind the 

 tubercles. There is a trace of a rauscle-spot below the tubercle and rather forwards. 



C. quadrata. Length ^; height \ ; thickness ^ inch. Proportions 19 : 14 : 15. 



C.WrigJdii. „ „ i; „ i „ „ 22:16:18. 



C. cruciata. Length 4 millimetres. „ 18 : 18 : 20. 



0. quadrata is longer and squarer than Cypridella cruciata, De Kon. ; its tubercles are 

 more free and globose ; its hood and prow far more knobly, and its posterior spine was 

 low down instead of being on the middle line. 



Two strongly featured casts in the light-coloured Carboniferous Limestone of Vise, 

 from M. Bosquet's collection, form the basis for the above specific determination. 



