62 REPORT ON FORAMINIFERA AND OSTRACODA 



It is of great interest to find this species in the Antarctic Sea, for it is otherwise 

 almost exclusively a North Atlantic form. M. elorvjata has been recorded by Dr. 

 Flint from the West Indian seas, and it has been met with once in the South Atlantic, 

 and occasionally in the South Pacific. 



The present' examples are typical ; the proportion of fine arenaceous mud prepon- 

 derating, however, over the spicular material in the construction of the test. 



Occurrence. — Sample No. 8, 353 fathoms, rare. 



Marsipella cylindrica, H. B. Brady (Plate II, fig. 15) 



Marsipella cylindrica, H. B. Brady, 1884, Rep. ('hall, vol. ix, p. 265, pi. xxiv, 

 figs. 20-22. 



The figured specimen of the present series is a regularly tapering and gently curved 

 variety ; whilst another example from the same sounding is enormously large compared 

 with those already known, measuring as much as 13 mm. in breadth at the widest end. 



The species is a typically delicate and slender form in the Faroe Channel dredgings 

 at 530 and 542 fathoms. It has also been found in the South Atlantic and South 

 Pacific, generally at great depths. 



Occurrence. — Sample No. 14, 472 fathoms, two specimens. 



Family— LITUOLID.E 



Sub-family — LiTUOLiNiE 



Genus — Reophax, Montfort, 1808 



Reophax spicidifera, H. B. Brady (Plate III, fig. 16) 



Reophax spicidifera, H. B. Brady, 1879, Quart. Joum. Micr. Sci., vol. xix, N.S., 

 p. 54, pi. iv, figs. 10, 11. Idem, 1884, Rep. Chall, vol. ix, p. 295, pi. xxxi, figs. 16, 17. 



The tests of the Antarctic specimens are short, consisting of few segments, but 

 they are otherwise typical. As an organism showing strong selective power in regard 

 to the material from which it constructs its tests, it is most remarkable. The ac- 

 companying arenaceous genera here comprise forms like Haplophragmium, and the 

 truly arenaceous species of Reophax, as R. dentaliniformis, together with arenaceous 

 Miliolince, all of which employ siliceous sand grains for the walls of the test. * 



This species has occurred at Sombrero Island, West Indies, 450 fathoms ; Kerguelen 

 Island, 20-120 fathoms ; near the Sandwich Islands, 2350 fathoms ; off Kandavu, 

 255 and 610 fathoms ; and off Tahiti, 620 fathoms. 



Occurrence. — Sample No. 12, 460 fathoms, very rare ; No. 14, 472 fathoms, rare ; 

 No. 15, 655 fathoms, rare. 



* The following note, written by Sir John Murray on the same subject, occurs in the Challenger 

 Report, Summary of Results, ]>t. i. ls'.)5, p. 511 : " Among the arenaceous species from Sta. 157 there 

 are many interesting illustrations of the mode in which these Rhizopods select and arrange the 

 various particles in the deposit to form their tests. Astrorhiza crassatina here forms its test almost 

 exclusively of the spherical Radiolarian Cromyosphcera Antarctica ; Storthosphcera selects the finest 

 mineral particles, with an occasional larger particle of quartz or palagonite ; one form selects only 

 the shells of the pelagic Foraminifera, and another only the smallest Diatomacea: ; Reophax nodulosa 

 makes use of many large Coscinodisci, arranging them flat ways over the surface, and Rhabdammina 

 abyssorum forms its tube of the larger angular fragments of quartz, felspar, magnetite, and other 

 mineral particles." 



See also Heron-Allen and Earland (Journ. Quel-. Micr. Club, ser. 2, vol. x, 1909, pp. 403-412, 

 pi. xxxii-xxxv) for an interesting account of the occurrence of a foraminifer, Teeluntella thompsoni, 

 which constructs its test of the plates of Holothuria sp. 



