680 Transactions of the Society. 



178. Truncatulina tenuimargo Brady. (Plate XX. fig. 2, a, b.) 



Truncatulina tenuimargo Brady, 1884, Foram. ' Challenger,' p. 662, pi. xciii. 



figs. 2, 3. 



The specimens are sufficiently typical to claim place in Brady's 

 species. The line of demarcation between this and T. looatula, 

 however, entirely depends on the development of the keel, and the 

 extent to which this keel is developed probably depends upon the 

 nature of the surface to which the specimen was adherent. We 

 have observed that whereas T. lobatula is extremely abundant in 

 the recent stage attached to polyzoa and seaweeds, such specimens 

 rarely or never develop any trace of the keel, whilst individuals 

 which have grown in the attached form on smooth shells and 

 stones have a marked tendency in this direction. 



179. Truncatulina wuellerstorfi Schwager sp. 



Anomalina wuellerstorfi Schwager, 1866, Novara. Exped. geol. Theil, vol. ii. 



p. 258, pi. vii. figs. 105, 107. 

 Truncatulina ivuellerstorfi (Schwager) Brady, 1884, Foram. ' Challenger,' p. 



662, pi. xciii.' figs. 8, 9. 

 P\anorbulina Wtillerstorfi (Schwager) Goes, 1894, Arctic and Scandinavian 



Foramimfera, p. 89, pi. xv. fig. 777. 



Fossil. The specimens are small, compared with recent types, 

 and particularly so when compared with those obtained by E. 

 Lechmere Guppy from the Miocene clays of Trinidad, in which 

 deep-water deposits the species occurs of a size such as we have not 

 seen elsewhere. 



180. Truncatulina haidingerii d'Orbigny sp. 



Botalina haidingerii d'Orbigny, 1846, Foram. Foss. Vienne, p. 154, pi. vii. 



figs. '7-9. 

 Planorbulina haidingerii (d'Orbigny) Brady, 1864, Trans. Linn. Soc. Loud. 



vol. xxiv. p. 469, pi. xlviii. fig. 11. 



EXPLANATION OF PLATE XX. 



Fig. 1 (a). — Truncatulina ungeriana d'Orbigny. Superior surface. 



,, (b). — Ditto. Inferior surface. 



,, (c). — Ditto. Side view. 



,, 2 (a). — Truncatulina tenuimargo Brady. Inferior surface. 



,, (b). — Ditto. Superior surface. 



,, 3 (a). — Pulvinulina semi-marginata d'Orbigny. Superior surface. 



,, (b). — Ditto. Inferior surface. 



„ (c).-- Ditto. Side view. 



„ 1 («). — Pulvinulina concentrica Parker and Jones. Superior surface. 



,, (b). — Ditto. Inferior surface. 



,, 5(a). — P ul riu u I ma hauerii d'Orbigny. Superior surface. 



,, (b). — Ditto. Inferior surface. 



,, (c). — Ditto. Side view. 



Figs. 3 a, b, c x 200 diam. ; tbe others X 100 diam. 



