44 CRETACEOUS ENTOMOSTRACA. 



Length 1*0 ; height '4 ; thickness '36 mm. 



A carapace with one of the valves damaged. Right valve (figure seen in a 

 reversed position) like a pea-pod ; elongate, suboblong, rounded in front, obliquely 

 curving to a subacute postero-ventral angle behind ; slightly arched on the dorsal, 

 and straight on the ventral edge ; surface smooth, gently convex, thickest at the 

 anterior, highest at the posterior third ; edge view of the carapace narrow-oval, 

 somewhat blunter behind than in front. 



Carapaces approximately similar in shape may be Cijtherina recta, Reuss 

 (' Haid. Naturw. Abhandl.,' vol. iii, part 1, 1850, pi. viii, fig. 11), G. heterostigma^ 

 Reuss (ibid., fig. 23), and Aglaia complanata, Brady and Robertson (1869), ' Trans. 

 Roy. Dublin Soc.,' ser. 2, vol. iv, 1889, p. 94, pi. xiv, figs. 28 and 29; but Alth's 

 Gytherina acuminata (Cretaceous from Lemberg), as figured by Reuss in ' Haid. 

 Naturw. Abhandl.,' vol. iv, part 1, 1851, p. 49, pi. vi, fig. 7 (not 8), is so similar in 

 character that we must take it to be the same. 



Localities. — In the flint-dust from the Chalk of Glenarm, Antrim. Coll. Mr. 

 Joseph Wright, F.G.S. 



III. CYTHBRELLID^. 



I. Cytherella, Jones, 1849, and Bosquet, 1852. 



For notes on the fossil species of this genus see the ' Monograph of the Brit. 

 Foss. Biv. Bntomostraca from the Carboniferous Formations,' by Jones, Kirkby, 

 and Brady, part 1, No. 2, 1884, pp. 57 — 69; also the ' Supplem. Monogr. Tert. 

 Entom.,' by Jones and Sherborn, 1889, p. 47. 



1. Cytherella ovata (Bomer). Plate III, figs. 48 — 54; and Plate IV, fig. 39. 



CxTHEEiNA, Li/ell and Lonsdale. Elem. Geol., 1838, p. 55, fig. 19. 



— ovata, Bomer. Verstein. nordd. Kreidegeb., 1840, p. 104, pi. xvi, 



fig. 21. 



— COMPLANATA, Reuss. Versteiii. bohm. Kreideform., pt. 1, 1845, p. 16, 



pi. V, fig. 34 (icon mala). 



— OVATA, Seuss. Ibid., pi. vi, fig. 35. 



Cttheee EENifOEMis, Bosquet. Mem. Soc. Eoy. Sci. Liege, vol. iv, 1847, p. 356, 



pi. i, figs. 1 a—f. 

 Cttheeella OVATA, Jones. Monogr. Entom. Cret., 1849, p. 28, pi. vii, figs. 



24 a—i. 



