262 Transactions of the Society. 



Usually the sutures are more depressed than in the figures given 

 by Reuss, consequently the chambers are more inflated. 



Polymorphina lactea var. oblong a Williamson, plate V. tig. 5. 



Polymorphina lactea (W. and J.) var. oblong a Williamson, 1858, 

 Pec. Foram. Gt. Britain, p. 71, pi. vi. fig. 149. P. oblonga (Will.) 

 Brady, Parker, and Jones, 1870, Trans. Linn. Soc, vol. xxvii. p. 222, 

 pi. xxxix. fig. 7. P. oblonga (Will.) Terquem, 1875, Ess. Anim. Plage 

 Dunkerque, part i. p. 37, pi. v. fig. 11. P. formosa Egger, 1893, 

 Abhandl. k. bayer. xlkad. Wiss., CI. II. vol. xviii. p. -140, pi. ix. 

 figs. 17-19. 



This is an intermediate variety connecting P. lactea with P. 

 compressa, and must not be confounded with the P. oblonga of 

 d'Orbigny, which resembles an elongated P. problema. The ex- 

 ample figured well represents the normal form, with the exception 

 that it possesses a supplementary chamber of a Nodosarian cha- 

 racter. This is evidently a monstrosity, otherwise the specimen 

 would have to be assigned to the genus Dimorphina . This chamber 

 appears to have nothing in common with the fistulose extraneous 

 growths so frequently found in the Polymorphina;. generally, but 

 rare or unknown in the examples from the Malay Archipelago. 



P. lactea var. oblonga occurs in more or less abundance at 

 several Stations in both Areas. 



Of its distribution generally Brady, Parker, and Jones write, 

 "The geographical range of P. oblonga seems to be limited; it is 

 most abundant on the Devonshire and Cornwall coast, and may 

 be found sparingly distributed at intervals all round the British 

 Islands. We are not aware of its occurrence in the seas of warmer 

 latitudes or in a fossil condition." 



P. formosa is recorded by Egger from Cape Verde Islands, 

 38 fathoms; and from West Australia, 196 fathoms. 



As a fossil it is not uncommon in the tertiary beds of St. Erth. 



Polymorphina compressa d'Orbigny. 



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

 part 2, p. 114, pi. cxiv. fig. F ; pi. cxv. fig. N ; pi. cxvi. tig. X. Poly- 

 morphina compressa d'Orbigny, 1846, For. Foss. Vienne, p. 233,. 

 pi. xii. figs. 32-34. P. aff. amygdala Deecke, 1886, Mem. Soc. 

 emul. Montbeliard, ser. 3, vol. xvi. p. 37, pi. i. fig. 20. P.polygona 

 Terquem, 1886, Meni. Soc. Geol. France, ser. 3, vol. iv. p. 63, pi. 

 xiii. fig. 18. P. lactea (W. and J.) Dawson, 1886, Handbook 

 Zoology, p. 44, fig. 34. P. compressa (d'Orb.) Mariani, 1888, Boll. 

 Soc. Geol. Italia, vol. vii. p. 288, pi. x. fig. 13. P. compressa (d'Orb.) 

 Egger, 1893, Abhandl. k. bayer. Akad. Wiss., CI. II. vol. xviii. p. 309,. 

 pi. ix. figs. 11-13. P. compressa (d'Orb.) Goes, 1894, K. Svenska 



