Dr. R. L. Sherlock — Foramhiifera of Speeton Clay. 261 



Crick & Sherborn (Journ. Northants. Nat. Hist. Soc, 1891, p. 5, pi., 

 fig. 25), and it is still living. The Challenger Expedition found it 

 at depths of from 95 to 2,750 fathoms. 



Horizon. — Present in B base c, C^, and Dg mid. Fairly abundant. 



Cristcllaria gihba, d'Orbigny. (PI. XIX, Fig. 9a, b.) 



Cristellaria cjihba, d'Orbigny, 1839 : Foram. Cuba, p. 63, pi. vii, figs. 20, 21. 

 G. nuda, Eeuss, 1861 : Sitzungsb. d. k. Ak. Wiss. Wien, vol. xliv, p. 328, 



pl. vi, figs. 1-8. 

 G. pulchella, Reuss, 1862 : ibid., vol. xlvi, p. 71, pJ. viii, fig. 1. 

 G. gihba, Chapman, 1896: Journ. Roy. Micr. Soc, p. 4, pl. i, figs, la, b. 



Remarks. — This species is closely allied to C. acutauricularis and 

 has the same range in time. It is recorded from the Upper Hils Clay 

 of Germany (Reuss), the Gault of Folkestone (Chapman), and the 

 Bargate Beds (Lower Cretaceous) of Surrey (Chapman), and from 

 the Red Chalk of Speeton (Burrows, Sherborn, & Bailey). The 

 Challenger Expedition found it at depths of less than 500 fatlioms. 



Horizon. — Present in Upper C2, Upper C3, G-^q. Common in Upper 

 €'2, one specimen from each of the other horizons. 



Cristellaria cephalotes, Reuss. (Pl. XVIII, Fig. 20.) 



Gristellaria cephalotes, Reuss, 1862 : Sitzungsb. d. k. Ak. Wiss. Wien, 

 vol. xlvi, p. 67, pl. vii, figs. 4-6. 



Reniarlcs. — A single, very thick specimen seems to belong to this 

 species. It has been recorded by Reuss from the Upper Hils and the 

 Jfinimtis-elay of Germany. 



Horizon. — Found in B base b. One specimen. 



Cristellaria scitula, Berthelin. (Pl. XIX, Fig. 5.) 



Cristellaria scitula, Berthelin, 1880: Mem. Soc. geol. France, ser. Ill, vol. i, 



No. 5, p. 53, pl. iii, figs. 'da-c. 

 G. scitula. Chapman, 1894 : Journ. R. Micr. Soc, p. 652, pl. x, figs, la, b. 



RemarJcs. — This species has been recorded by Berthelin and Chapman 

 in the Gault of Northern France and Folkestone. 

 Horizon. — One specimen was found in B base c. 



Cristellaria chapmani, sp. nov. (Pl. XIX, Fig. 7a, b.) 



Description. — Test suboval, with nearly flat sides. It consists of 

 about six chambers, arched, and divided by marked sutural ridges 

 which end abruptly in front, and, near the back, end in a ridge 

 parallel with the dorsal edge. The spiral commencement is obscure. 

 There is no umbilicus. The dorsal edge is smoothly curved, and 

 there is a keel about equally developed with the ridges following the 

 dorsal edge. The aperture is terminal. Length about "492 mm. 

 (•0194 in.), greatest breadth -304 mm. (012 in.). 



The form is nearest to C. hradyana. Chapman (Journ. Roy. Micr. 

 Soc, 1894, p. 654, pl. x, figs. 13«, b). It has, however, fewer cliambers, 

 the sutural ridges and the dorsal edge are not sinuous, and the dorsal 

 ridges are as well developed as the small keel. 



I have named this species after Mr, Frederick Chapman in 



