WEBBINA. 139 



HAPtOPHEAGMiuM GLOMEEATUM, 5r«(7y, 1884. Eep. ' Challenger,' p. 309, pi. xssiv, 



figa. 15—18. 



— — Bnlkicill and Millett, 1884. Journ. Micr. Nat. 



Sci., vol. iii, p. 25, pi. i, fig. 6. 



— — Chapman, 1892. Journ. E. Micr, Soc, p. 321, 



pi. V, fig. 8. 

 _ _ Ooes, 1894. K. Svensk. Vet.-Akad. Handl., 



vol. XXV, No. 9, p. 23, pi. v, figs. 134—139. 



Gharacterft. — Spiral, subglobular; segments few, three or four in the outer 

 whorl. 



Occurrence. — This species has a wide geographical range. It is common in 

 Arctic and Antarctic seas at moderate depths (14 to 200 fathoms). In tropical 

 and subtropical seas it is found at greater depths. As a fossil it was first 

 recorded by Mr. Chapman from the Gault of I'olkestone, where it is rather 

 common. We have found the form that is here figured in nearly every zone of 

 the Crag examined. It is common at Sudbourne Hall, zone d, and at Aldborough, 

 zone g. 



Note. — There is much doubt as to this being Haflophragmium glomeratum. It 

 may well be the young (initial) form of TextUaria gihhosa. This supposition is 

 borne out by the fact that wherever T. gihhosa is common, the small form here 

 referred to H. glovieratum is also plentiful. Arenaceous species, besides TextUaria, 

 are, as a rule, very rare in the Crag. 



Suh-family 2. — TKOCHAMMiNiNiE. 



Bradj/, Report ' Challenger; 1884, pp. QQ and 321. 



General Cltaracters. — Test thin, consisting of minute sand-grains incorporated 

 with calcareous or other inorganic cement, or embedded in a chitinous membrane ; 

 exterior smooth, often polished ; interior smooth, often reticulate, not labyrinthic. 



Trochammina, Jones and Parker, 1859 (see Part I, 1886, pp. 25 — 27). — More 



or less septate; rotaliform, trochoid, or irregular. 

 Ammodiscus, Reuss, 1861 (divided off from the foregoing). — Non-septate and 



tubular ; spiral or irregular. 



Genus 1. — Webbina, d'Orhigmj, 1839. 



Brady, Report ' Challenger J pp. 6C and 348. 



General Characters. — Adherent ; single tent-like chamber, or a series, connected 

 by semi-tubular stoloniferous passages. 



19 



