Report on Foraminiftra. By F. W. Millett. 545 



lata of Egger,* a minute form which he states may be the juvenile 

 stage of B. lobata. 



In one variety the test becomes longer and less compact in the 

 arrangement of the chambers, which also become more inflated, thus 

 showing a tendency to approach B. convallaria. 



It is one of the commonest forms in the Malay Archipelago, and 

 is found in abundance at most of the Stations. 



Bolivina plicata d'Orbigny. 

 Bolivina plicata d'Orbigny, 1843, Foram. Amer. Merid., p. 42, 

 pi. viii. figs. 4-7. B. plicata (d'Orb.) Halkyard, 1889, Trans, and 

 Ann. Eept. Manchester Micr. Soc, p. 35, pi. i. fig. 13. B. plicata 

 (d'Orb.) Goes, 1894, K. Svenska Vet.-Akad. Handl., vol. xxv. p. 51, 

 pi. ix. figs. 487, 488. B. plicata (d'Orb.) Wright, 1900, Geol. Mag., 

 dec. 4, vol. vii. p. 100, pi. v. fig. 7. 



It is difficult to reconcile, one with the other, d'Orbigny's figures 

 of B. plicata and B. costata. In his ' Amerique Meridionale,' plate 

 viii. fig. 4, is described as B. plicata, whilst in his ' Bassin Tertiaire 

 de Vienne ' a copy of this figure with the addition of a representa- 

 tion of its oral aspect, appears under the name of B. costata. In 

 Carpenter's ' Introduction ' f these figures are copied to illustrate 

 B. costata. 



B. plicata is very rare in the Malay Archipelago, and the few 

 specimens found mostly resemble those from brackish water figured 

 by Brady .J 



Bolivina costata d'Orbigny. 



Bolivina costata d'Orbigny, 1843, Foram. Amer. Merid.. p. 62, 

 pi. viii. figs. 8, 9. B. costata d'Orbigny, 1846, For. Foss. Vienne, 

 p. 239, pi. xxi. figs. 44, 45. B. costata Brady, 1884, Chall. Kept., 

 p. 426, pi. liii. figs. 26, 27. 



The specimens are neither numerous nor in all respects charac- 

 teristic. In contour they resemble those figured by Brady in the 

 ' Challenger ' Beport, and as in them, the costae are frequently inter- 

 rupted and fail to bridge over the sutures. The aperture is however 

 always without a thickened margin, which is, according to D'Orbigny, 

 one of the characters of the species. 



The ' Challenger ' Stations are Kaine Island, Torres Strait, 155 

 fathoms; Humboldt Bay, Papua, 37 fathoms; and off Amboyna, 15 

 to 20 fathoms. Goes records it from the Pacific, 730 fathoms. 



Bolivina subangularis Brady. 



Bolivina subangularis Brady, 1881, Quart. Journ. Micr. Sci., 

 vol. xxi. n.s. p. 59. B. subangularis Brady, 1884, Chall. Piept., 

 p. 427, pi. liii. figs. 32, 33. 



* Abhandl. k.'bayer. Akad. Wiss., CI. ii. vol. xviii. 1893, p. 301, pi. viii. figs. 53, 54. 



t Page 196, pi. xii. fig. 22.~ 



X Ann. and Mag. Nat. Hist., ser. 4, vol. vi. 1870, p. 302, pi. xii. fig. 7. 



