8 Transactions of the Society. 



p. 184, pi. v. tig. 6. L. costata (Will.) Haeusler, 1890, Mem. Soc. 

 Pal. Suisse, vol. xvii. p. 88, pi. xv. fig. 42. L. gracilis (Will.) Egger. 

 1893, Abhandl. k. bayer. Akad. Wiss., CI. II. vol. xviii. p. 328, pi. x. 

 fig. 33. 



This form varies very much in the character of the sculpture of its 

 surface. The figured specimen resembles the L. mucronulata of Eeuss.* 



It is not very numerous in the Malay Archipelago, but occurs at 

 several Stations in both Areas. 



Lagena acuticosta Reuss. 



L. acuticosta Reuss, 1861, Sitzungsber. k. Akad. Wiss. Wien, vol. 

 xliv. p. 305, pi. i. fig. 4. L. sulcata var. acuticosta (Reuss) Brady, 

 Parker, and Jones, 1888, Trans. Zool. Soc, vol. xii. p. 222, pi. xiiv. 

 figs. 26, 31. L. acuticosta (Reuss) Chapman, 1893, Journ. R. Micr. 

 Soc, p. 583, pi. viii. fig. 11. L. acuticosta (Reuss) Egger, 189:!, 

 Abhandl. k. bayer. Akad. Wiss., CI. II. , vol. xviii. p. 329, pi. x. figs. 

 47, 48, 82, 83. L. acuticosta (Reuss) Jones, 1895, Paleont. Soc, 

 p. 188, pi. i. figs. 42, 43 (1866). L. acuticosta (Reuss) Egger, 1899, 

 Abhandl. k. bayer. Akad. Wiss., CI. II. vol. xxi. p. 106, pi. \i. fig. 62. 



This variety, which can hardly be separated from L. costata, has in 

 the Malay Archipelago the same distribution, and occurs in about 

 equal quantities. 



Lagena melo d'Orbigny sp. 



Oolina melo d'Orbigny, 1843, Foram. Arner. Merid., p. 20, pi. v. 

 fig. 9. Lagena melo (d'Orb.) Jones, Parker, and Brady, 1866, 

 Paleont. Soc, p. 38, pi. i. fiir. 35. L. melo (d'Orb.) Brady, Parker, 

 and Jones, 1888. Trans. Zool. Soc, p. 222, pi. xliv. figs. 21, 24. L. 

 melo (d Orb.) Jones, 1895, Paleont. Soc, p. 192, fig. 20. 



This variety is but poorly represented , the examples being few and 

 insignificant. 



Lagena hexagona Williamson. 



Entosolenia squamosa var. hexagona Williamson, 1848, Ann. and 

 Mag. Nat. Hist., ser. 2, vol. i. p. 20, pi. ii. fig. 23. Lagena hexagona 

 (Will.) Jones, 1895, Paleont. Soc, p. 193, pi. vi. fig. 7, and w.c fig. 21. 

 L. hexagona (Will.) Wright, 1900, Geol. Mag., dec 4, vol. vii. p. 100, 

 pi. v. fig. 15. 



In the Malay Archipelago this is the best represented of the 

 reticulated forms. The specimens are well grown, abundant, and 

 are distributed all over the Region. 



Lagena reticulata Macgillivray sp. 



Lagenula reticulata Macgillivray, 1843, Hist. Moll. Animal. 

 Aberdeen, &c, p. 38. Lagena reticulata (Macgill.) Reuss, 1862, 



* Sitzuugsber. k. Akad. Wiss. Wien, vol. xlvi. 1862 (18G:]) p. 329, pi. iv. fig. 52. 



