200 FORAMINIFERA OF THE CRAG. 



Lagena mahginata, Egger, 1893. Abhandl. k. Bayer. Akad. Wise., vol. xviii, 



part 2, pp. 321 and 332, pi. x, figs. 20, 66, 

 67, 96, 97. 

 — — Ooes, 1894. K. Svensk. Vet.-Akad. Handl, vol. xxv. No. 9, 



p. 81, pi. xiii, figs. 748—751. 



Fig. 22. — Lagena marginata (Montagu). (From the ' Phil. Trans.,' 

 vol. civ, pi. xvi, fig. 12 a.) 



Characters. — Sublenticular, pyriform or oval (occasionally trigonal), more or 

 less compressed ; keeled or winged at the edge ; aperture entosolenian, narrow ; 

 base sometimes spinose. 



Occurrence. — Lagena marginata is found in all latitudes and at all depths. Its 

 geological range is likewise extensive. It has been recorded from the Gault of 

 Folkestone ; the Chalk of the island of Riigen ; the Eocene (London Clay, and the 

 Calcaire Grossier) ; the Oligocene of Germany (Pietzpuhl) ; the Miocene of Malaga, 

 Messina, Vienna, and Muddy Creek (Victoria) ; the Pliocene of Italy and St. Brth ; 

 and from various Pleistocene formations. We have in our own collections speci- 

 mens from the Casterlian and Scaldisian of Antwerp. In the Coralline Crag 

 L. marginata occurs with varying frequency in every zone examined. It has also 

 been recorded from the Red Crag. 



18. Lagena seminiformis, Schumger, 1866. Plate VII, fig. 10. 



MiLiOLA STILIGEEA ? Ehrenherg, 1854. Mikrogeol., pi. sxxi, fig. 6. 



Lagena seminifoemis, Scliwager, 1866. Novara-Exped. Geol. Theil., vol. ii, 



p. 208, pi. V, fig. 21. 

 Entosolenia maeginata? Chimmo, 1878. Nat. Hist. Euplectella, p. 21, pi. vi, 



figs. 20 a— ^. 

 TissuEiNA DiPTEEA, Segitenza, 1880. R. Aocad. Lincei, ser. iii, vol. vi, p. 332, 



pi. xvii, fig. 36. 

 Lagena seminifoemis, Brady, 1884. Eeport ' Challenger,' pp. 447 and 478, 



pi. lix, figs. 28—30. 



Characters. — Body circular, biconvex ; with broad peripheral wing, extended at 

 the base so as to form two points separated by a wide central depression. 



Occurrence. — Lagena seminiformis was found by the ' Challenger ' at several 

 stations, but invariably in very deep water (1000 to 2350 fathoms). As a fossil 

 it has been recorded from the Chalk of Volsk (Ehrenberg), and from the Pliocene 

 of Kar-Nicobar and St. Erth. One specimen only has been found in the Coralline 

 Crag. It comes fi^om Broom Hill, zone d. 



