2 CRETACEOUS ENTOMOSTRACA. 



p. 35, pi. ii, fig. 2, differs from fig. 50 in having a thicker posterior third, ending 

 obtusely. 



Localities. — P. gracilis has been collected from the Detritus (Lower Chalk and 

 Chalk-marl) at Charing/ Kent, by the late Mr. W. Harris, F.G.S. ; and from the 

 Chalk at Keady Hill,^ co. Londonderry, by Mr. Joseph Wright, F.G.S. 



2. Paeacypris siliqua, sp. nov. Plate II, figs. 48, 49, 51 ; Plate III, figs. 83, 34. 



Pakacypeis geacilis, Jo7ies. System. Lists, &c., Belfast Nat. Field Club, vol. i, 



Appendix iii, 1875, pp. 79 and 81. 



Fig. 49. Length '88 ; height '32 ; thickness^ '32 mm. 



Fig. 33. „ -9; „ -3; „ -3 „ 



Elongate, narrow, arched on the back (slightly flattened at the hinge-line in 

 some instances, figs. 49 and 51), and sloping posteriorly to an oblique point ; 

 obliquely rounded in front, sinuous and incurved on the ventral border. Edge 

 view of the united valves is long, obovate, acute at both ends ; end view, sub- 

 orbicular. The carapace somewhat resembles a radish pod. Fig. 34 shows the 

 most curvature or arching, and is rather blunter posteriorly than the others. Fig. 

 49 ofiers a close resemblance to the Tertiary specimen of Paracypris polita,'^ Sars, 

 figured and described by Gr. S. Brady, ' Trans, Zool. Soc, vol. x, 1878, p. 381, pi. 

 Ixiii, fig. 5. 



This form has some resemblance to the male^ of Pontocypris faba (Reuss), as 

 defined, with some doubt, by Dr. G. S. Brady, ' Challenger Report,' 1880, p. 37, pi. 

 i, fig. 4 d (the female being much like G. attenuata, Reuss, ' Bohm. Kreidef.,' 1846, 

 pi. xxiv, fig. 15), and ' Trans. Zool. Soc.,' vol. x, 1878, p. 382, pi. Ixiii, figs. 6 a — e. 

 Fossil in the Antwerp Crag, and recent in Bass's Strait and off Honolulu. It is, 

 however, proportionally longer, and has less height dorsally, tapers more slowly 

 at the posterior third, and is not so convex. 



Localities. — The specimen shown in PL II, figs. 48 and 49, was collected by 

 Mr. Joseph Wright, F.G.S., from the Chalk of the Black Hill, near Hannahstown, 



1 See ' Monograph Entom. Cret.,' 1849, p. 2. 



2 Only those localities in Ireland from which we have seen specimens are particularised in this 

 Monograph ; but other localities for these Ostracoda from theJUnt-meal are enumerated by Mr. Wright 

 in the System. Lists, &c., Belfast iSTat. Field Club, vol. i, Api^endix iii, 1875, pp. 76—81, and 92, 93. 



^ The thickness in all these measurements is that of carapace (united valves). 



* In the recent state P. polita is figured by Dr. Brady in the ' Trans. Linn. Soc.,' 1868, p. 378, 

 pi. xxvii, figs. 1 — 4. 



^ This male (?) individual of P. faba difi^ers from the male ascribed to the same species by Dr. 

 Brady in the 'Trans. Zool. Soc.,' vol. x, pi. Ixiii, figs. 6c — e, being much less arched at the antero- 

 dorsal, and more incurved at the ventral margin. 



