THE SHORE-SAND AT BOGXOR, SUSSEX. 201 



Placopsilina cenomana, Brady, 1887, Synopsis of British Recent 



Foraminifera. 

 Rare. 



Sub-family 2 — Trochammininae. 



Thurammina, Brady. 



Thurammina papillata, Brady. 



4< Orbuline Lituola," Carpenter, 1875, The Microscope, 5th ed., 



p. 533, fig. 273, g, h. 

 Thurammina papillata, Brady, 1879, Quart. Jour. Micr. Sci., vol. 



xix., N.S., p. 45, pi. v., figs. 4 — 8. 



„ „ Brady, 1884, Report "Challenger," p. 321, 



pi. xxxvi., figs. 7 — 18. 



„ „ Brady, 1887, Synopsis British Recent 



Foraminifera. 

 The specimens figured in Plate 11, Figs. 6, 7, and Plate 14, 

 Figs. 1, 3, give but a very faint idea of the protean forms assumed 

 by the organism which is, with some hesitation on the part of Mr. 

 J. Wright and myself, referred to this species. They are of fairly 

 frequent occurrence in the shore-sand, and no two specimens are 

 alike, some being comparatively smooth and more or less regular 

 in shape, while others are of the roughest construction and more or 

 less lobate in outline. The specimens are both free and attached, 

 and the free-growing tests are usually of much neater and more 

 regular construction than the attached specimens. In colour 

 they are of a light grey, and composed of sand-grains and a grey 

 cement. The size of the sand-grains is very variable, even in 

 a single specimen, and frequently one or more sand-grains of 

 relatively enormous size (one-sixth to one-fourth of the whole 

 bulk of the test) are built into the test, from the surface of which 

 they project, giving a very rough and unfinished appearance to 

 the shell. The sand-grains are attached to a delicate chitinous 

 membrane which lines the cavity, and which in detached speci- 

 mens is observable as a transparent film enclosing the body 

 cavity. The "irregularly disposed perforate papillae," which, 

 according to Brady, are characteristic of the test, are well marked 

 in some specimens ; in others they are entirely absent. 



Brady records a single specimen of Thurammina papillata 

 from Loch Scavaig, West Scotland, 45 — 60 fathoms, but does 

 not state whether it was of normal character. 31 r. Wright has 



