278 Transactions of the Society. 



figs. 7, 10. B. marginata (d'Orb.) Egger, 1893, Abhandl. k. bayer. 

 Akad. Wiss., CI. II. vol. xviii. p. 287, pi. viii. figs. 69, 70. B. mar- 

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

 p. 46, pi. ix. figs. 439-414. B. marginata (d'Orb.) Jones, 1895, 

 Palaeont. Soc, p. 165, pi. iii. figs. 5, 6. B. marginata (d'Orb.) Wright, 

 1900, Geol. Mag., dec. 4, vol. vii. p. 100, pi. v. fig. 4. 



Of this well-known species there is little to be noted. It is abun- 

 dant all over the Kegion, and the specimens exhibit the usual variations 

 of form. 



Bulimina marginata var. biserialis var. n., plate II. fig. 7. 



Differs from the type in being biserial. It is also more sym- 

 metrical, tapering regularly from the oral to the aboral end. The 

 crenulations of the free edge of the chambers often develope into 

 spines. Its nearest representative amongst the triserial forms appears 

 to be the B. jmlchella of d'Orbigny.* 



According to the definitions of the genera, this form should be 

 placed amongst the Bolivinae, but it is so manifestly a variety of 

 Bulimina marginata that there need be no hesitation in associating it 

 with that species. 



It is less numerous and less widely distributed than the type, but 

 occurs in both areas. 



Bulimina aculeata d'Orbigny. 



" Polymorpha Pineiformia " Soldani, 1791, Testaceographia, vol. i. 

 part ii. p. 118, pi. cccxxvii. fig. ii., and pi. cxxx. figs, v v. B. aculeata 

 d'Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 269, No. 7. B. aculeata 

 (d'Orb.) Brady, Parker, and Jones, 1888, Trans. Zool. Soc, vol. xii. 

 p. 220, pi. xliii. fig. 8. B. aculeata (d'Orb.) Egger, 1893, Abhandl. 

 k. bayer. Akad. Wiss., CI. II. vol. xviii. p. 287, pi. viii. figs. 72, 78. B. 

 aculeata (d'Orb.) Jones, 1895, Palaeont. Soc, p. 163, pi. iii. figs. 1, 2. 

 B. aculeata (Czjczek) Egger, 1895, Jahresbericht xvi. Naturhist. Ver. 

 Passau, p. 17, pi. iii. fi»s. 8, 10, 13, 14. B. aculeata (d'Orb.) Flint, 

 1899, Kept. U.S. Nat/Mus. for 1897, p. 291, pi. xxxvii. fig. 4. B. 

 aculeata (Czjczek) Egger, lb99, Abhandl. k. bayer. Akad. Wiss., CI. II. 

 vol. xxi. p. 53, pi. xv. figs. 5, 6, 21. 



The examples all have the keeled or margined chambers character- 

 isteric of B. marginata, and may therefore be considered varieties of 

 that species. The form with globular chambers and spines at the 

 base only, which is probably derived from B. pwpoides, is not 

 represented. 



The species is less common in the Malay Archipelago anchor-mud 

 than B. marginata, which may perhaps be owing to the fact that it is 

 more of a deep-water species. 



» Foram. Ame'r. Merid., 1839, p. 50, pi. :. figs. 6, 7. ( 



