892 Transactions of the Society. 



Trochammina squamata, Brady, 1884, Challenger Eeport, p. 337, 

 pi. xli. fig. 8. 

 Concerning the distribution of this form, as distinct from Trocham- 

 mina ochracea on the one hand and ValvuUna fusca on the other, we 

 have but little reliable information. 



Trochammina ochracea, WiUiamson, sp. 



Uotalina ochracea, Williamson, 1858, Eec. For. Gt. Br., p. 55, pi. iy. 



fig. 112, pi. V. fig. 113. 

 Discorhina, turho, var. ochracea, Parker and Jones, 1862, Carpenter s 

 Introd. Foram., Appendix, p. 311. 

 Shetland (Williamson) ; shore-sand Galway (Balkwill and Millett) ; 

 Mount's Bay (Millett) ; generally distributed round the Irish coast, but 

 the number of specimens small (Wright). 



Trochammina plicata, Terquem, sp. 



Patellina j)Ucata, Terquem, 1876, Anim. sur la Plage de Dunkerque, 



2™e fasc, p. 72, pi. viii. fig. 9. 

 Trochammina plicata, Balkwill and Millett, 1884, Journ. Microsc. and 



Nat. Sci., vol. iii. p. 26, pi. ii. fig. 8. 

 Shore-sand Galway (Balkwill and Millett) ; Mount's Bay, Cornwall 

 (MiUett). 



Trochammina infiata, Montagu, sp. 



Nautilus injiatus, Montagu, 1808, Test. Brit., SuppL, p. 81, pi. xviii. 



fig. 3. 

 Botalina injiata, Williamson, 1858, Eec. For. Gt. Br., p. 50, pi. iv. 



figs. 93, 94. 

 Earely met with except in brackish water. 



Trochammina injiata, var. macrescens, Brady. 



Trochammina injiata, var. macrescens, Brady, 1870, Ann. and Mag. 

 Nat. Hist., ser. 4, vol. vi. p. 290, pi. xi. fig. 5. 



In brackish pools. 



I have great doubt as to the propriety of retaining this form under a 

 distinct name. The examination of a considerable series of specimens 

 suggests that it represents only the depauperated condition of Trocham- 

 mina injiata ; — in other words, that when Trochammina injiata lives in 

 pools, the water of which contains a very small proportion of mineral 

 constituents, the test loses its firm shelly consistence and becomes little 

 more than a chitinous envelope, so thin that the inflated contour of the 

 segments is lost when the specimens are taken out of fluid and dried. 



Trochammina nitida, Brady. 



Trochammina nitida, Brady, 1881, Quart. Journ. Micr. Sci., vol. xxi. 

 N.S. p. 52 ; 1881, Challenger Eeport, p. 339, pi. xh. figs. 5, 6. 



