CRETACEOUS ENTOMOSTRACA. 



2. Bairdia Hareisiana, Jones. Plate II, figs. 52 — 55. 



Baiedia Haeeisiana, Jones. Monogr. Entom. Cret., 184-9, p. 25, pi. vi, figs. 



17 a—e (not fig. 17/). Fig. 17 e is not repro- 

 duced here. 

 — — (partim?), Beuss. Elbthalgeb., &c., pt. 2, 1874, p. 141, 



pi. xxvi, figs. 6 and 7. 

 (Not Cttheeidea Haeeisiana, Bosquet. Mem. Commission Carte geol. Neer- 



lande, vol. ii, 1854, p. 73, pi. v, 

 fig. 5.) 



Fig. 54. Length -83 ; height -33 mm. 



Fig. 53. Thickness '33 mm. 



Fig. 52. „ -27 „ 



Valves elongate, convex, narrow, somewhat arcuate ; anterior end obliquely 

 rounded, posterior oblique and subacute ; left valve larger than the other, and 

 more uniformly arched on the back, which is slightly angular in the right valve. 

 Edge view compressed oval ; end view oval. 



Some of these features are present in Argilloecia cylindrica, G. 0. Sars ; but 

 they have a closer agreement with such a Bairdia as the recent B. complanata, 

 G. S. B., ' Trans. Linn. Soc.,' 1868, p. 390, pi. xxxiv, figs. 1—3, and the Tertiary 

 B. contrada, Jones, 'Monogr. Tert. Entom.,' 1857, p. 53, pi. v, fig. 1. 



The spots on the figures in the ' Monogr.,' 1849, are due to mottling produced 

 by mineral change. 



Localities. — From the Chalk of Keady Hill (Derry), and of Grravesend and 

 Charlton (Kent) ; Chalk-rock, Dunstable (Bedfordshire). Detritus, Charing (Kent). 

 Gault, Folkestone and Leacon Hill (Kent) ; Oreensand, Cambridge. 



Foreign. — Weinbohla and Strehlen (Reuss, 'Elbthalgeb.,' p. 141). 



2*. Bairdia Harrisiana, Jones ; var. amplior, nov. Plate II, fig. 57 ; and Plate IV, 



fig. 4. 



Fig. 57, right valve. Length '8 ; height '32 mm. 



Fig. 4, left valve. „ -83 ; „ '4 „ 



A right and a left valve, arched on the back, incurved at the middle of the 

 ventral border, obliquely rounded^ in front, and subacute behind, come from the 

 Chalk of Kent. The left valve (PI. IV, fig. 4) is larger, incurved for overlapping 

 at the back, and ends less sharply behind than the right valve (PI. II, fig. 57). 



1 The slight angularity on the front margin of the right valve in fig. 57 is too much emphasized. 



