Report on Foraminifera. By F. W. Millett. 495- 



In this variety the clear shell-substance surrounding {he aperture, 

 besides forming the marginal band as in L. laevigata, is produced on 

 the centre of each side into an oval or pear-shaped mass. Compared 

 with L. laevigata the test is usually broader at the base and more 

 angular, tapering towards the oral end. Many of the examples are, 

 however, elongate, and some apiculate. 



This form is by no means so common nor so widely distributed as 

 L. laevigata, and has received but little notice from writers on the 

 Foraminifera, It is very abundant in the Tertiary beds of St. Erth, 

 and the difference in the shell-structure is there as well marked as in 

 the recent specimens. 



Lagena fasciata Egger sp. plate VIII. fig. 19. 



Oolina fasciata Egger, 1857, Neues Jahrb. fur Min., p. 270, pi. v. 

 figs. 12-15. Lagena fasciata (Egger) Reuss, 1862, Sitzber. K. Akad. 

 Wiss. Wien, vol. xlvi. p. 323, pi. ii. fig. 24. Fissurina Nos. (50 and 

 67 von Schlicht, 1870, Foram. Septar. Pietzpuhl, p. 12, pi. iv. figs. 

 25-30. L. quadricostulata Reuss, 1870, Sitzber. K. Akad. Wiss. 

 Wien, vol. lxii. p. 469. L. quadricostulata (Reuss) Brady, 1884, 

 Chall. Rept., p. 486, pi. lix. fig. 15. 



Having traced the changes of form in the disposition of the clear 

 and the opaque shell-substance in L. laevigata and L. lucida, it is now 

 necessary to follow them through their further stages. Taking L. 

 annectens Burrows and Holland,* two narrow curved bands appear 

 on each side of the shell. In L. faba Balkwill and Millett these 

 bands are slightly raised, whilst they become costse in L. quadri- 

 costulata Reuss, L. fasciata Egger, and L. Meyeriana Chapman. J 



These bands may or may not unite at the base of the shell ; 

 Dr. Egger's examples of L. fasciata show both conditions, whilst in 

 the only known specimen of L. Meyeriana the costae, although 

 continuous, are recurved, and form a sinus at the aboral extremity. 



In the Malay Archipelago L. fasciata is abundant and widely 

 dispersed, and there is great variety not only in the form of the test,, 

 but in the strength and disposition of the costae. 



It is a common form in the Tertiary beds of St. Erth. 



Lagena multicosta Karrer sp., plate VIII. fig. 17. 



Fissurina midticosta Karrer, 1877, Abhandl. K. K. Geol. Reichs- 

 anstalt, vol. ix. p. 379, pi. xvi. b fig. 20, and Fissurina Bouei 

 p. 378, pi. xvi. b fig. 19. Lagena multicosta (Karrer) Brady, 1884, 

 Chall. Rept., p. 466, pi. lxi. fig. 4. Lingulina costata (d'Orb.) 

 Fornasini, 1889, Mioc. diSan Rufillo, pi. i. fig. 17. 



* PalsBont. Soc, 1895, p. 203, pi. vii. fig. 11. 



t Journ. Micr., vol. iii. 18S4, p. 81, pi. ii. fig. 10. 



X Quart. Journ. Geol. Soc, vol. i. 1894, p. 706, pi. xxxiv. fig. 7. 



