Vol. 50.] ME. E. CHAPMAN ON THE BAEGATE BEDS OP SUBSET. 697 



T. charoides, Carpenter, ' Introd. Foram.' 1862, p. 141, pi. xi. 

 fig. 3. 



Ammodiscus charoides, Brady, ' Challenger ' Bep. vol. ix. (1884) 

 p. 334,. pi. xxxviii. figs. 10-16. 



The Bargate specimens of the above species are rather minute, 

 measuring only from y^ to ^L inch (025 to 0*3 mm.). The test is 

 quite white and has a perfectly smooth surface. A. charoides is 

 known from the Swiss Jurassic, and also from Tertiary and recent 

 deposits. 



In the Bargate series it was found at Littleton only, in the clay 

 of the Pebble-beds (three specimens). 



15. Ammodiscus pleueotomaeioides, sp. nov. (PI. XXXIV. fig. 3 a, 



b,c.) 



Test coarsely arenaceous, consisting of a helicoid spiral of four 

 whorls. The basal aspect of the test is excavate, and the separate 

 whorls are not distinctly seen. The opposite face of the test is 

 convex. Diameter of test -fa inch (0*63 mm.) ; height T -^ inch 

 (0-21 mm.). 



This species is perhaps more nearly allied to A. gordialis than to 

 any other species of Ammodiscus ; especially since some examples 

 of the latter species have an irregular helicoid method of growth, 

 with the flat side more or less excavate. 1 It also appears to be 

 isomorphous with the perforate form Spirillina ohconica, Brady. 2 



One specimen from Bargate Pebble-beds, Littleton. 



Teochammina, Parker and Jones. 



16. Teochammina squamata, Jones & Parker, var. limbata, nov. 



(PI. XXXIV. fig. 4 a, b, c.) 



Test finely arenaceous, whitish and translucent. This variety 

 differs from the type-form T. squamata 3 in having the margins of 

 the chambers composed of transparent test-material. The test 

 has usually fewer convolutions than the type form, there being, as 

 a rule, two, or at the most three, while there are in T. squamata 

 as many as four. Diameter of the test -^j to -J D - inch (0*1 to 

 0-5 mm.). 



From Pebble-beds, Littleton (five specimens) ; from clay of Bar- 

 gate Beds, Holloway Hill (six) ; and from beds below Folkestone 

 series, Horsham Boad, Dorking (thirty-eight). 



1 See Burrows, Sherborn, & Bailey, Journ. Roy. Micr. Soc. 1890, p. 552, 

 pi. viii. fig. 7 ; also Chapman, Journ. Roy. Micr. Soc. 1892, p. 327, pi. vi. 

 fig. 13. 



2 Quart. Journ. Micr. Sci. vol. xix. n. s. (1879) p. 279, pi. viii. fig. 27 a, b. 

 Also ' Challenger ' Rep. vol. ix. (1884) p. 630, pi. Ixxxv. figs. 6, 7. 



3 Jones & Parker, Quart. Journ. Geol. Soc. vol. xvi. (1860) p. 304 ; 

 Carpenter, ' Introd. Foram.' 1862, p. 141, pi. xi. fig. 1 ; Brady, 'Challenger' 

 Rep. vol. ix. (1884) p. 337, pi. xli. fig. 3 a-c. 



