426 Transactions of the Society. 



106. Lagena orbignyana Seguenza sp. 



Entosolenia marginata (pars) Williamson, 1858, Recent Foram. Gt. Britain, 



p. 10, pi. i. figs. 19, 20. 

 Fissurina orbignyana Seguenza, 1862, Foram. Monotal. Misc. Messina, p. 6, 



pi. ii. figs. 65, 66. 

 Lagena orbignyana (Seguenza) Brady, 1884, Foram. ' Challenger/ p. 484, pi. 



lix. figs. 1, 18, 24-6. 

 Ditto. (Seguenza) Brady, 1887, Synopsis British Eecent Foraminifera. 



Fossil (frequent) and recent (rare). The recent specimens 

 present no features different from those usually found in shore 

 specimens, but the fossils, the majority of which are apparently 

 derived from clays, vary greatly in size, convexity, and width of 

 " wing." Some of the fossil specimens are covered with an adherent 

 matrix ; these may possibly be derived from the limestone of the 

 Mixon Eocks. 



107. Lagena orbignyana var. selseyensis var. n. 



(Plate XVII. figs. 1, 2.) 



Among the specimens referable to Seguenza's species L. Or- 

 bignyana are a number which possess sufficiently striking indi- 

 viduality to render them worthy of separate and particular notice, 

 and for them we propose the varietal name " selseyensis." The 

 specimens, which are all fossils, and apparently derived from the 

 same source of origin — which, judging from then appearance, was 

 probably a shell-sand of sub-tropical origin, such as characterises 

 the fauna of many early Tertiary formations — are of a somewhat 

 elongate form ; the two faces of the shell are nearly parallel and 

 surrounded by a raised edge, wiiich is also extended into a " wing." 

 The intermediate, or middle wing, which is of about the same 

 diameter all round the shell, is strongly marked. The shell is 



EXPLANATION OP PLATE XVII. 



Fig. 1. — Lagena orbignyana Seguenza sp. var. selseyensis. 



„ 2. — Ditto. Edge views. 



,, 3. — Polymorphina complanata d'Orbigny. 



„ 4.— Ditto. 



„ 5. — Ditto. Oral aspect. 



,, 6. — P. concava Will. Detached specimen. 



„ 7.— P. hirsuta B. P. and J. 



,, 8. — P. ornata Karrer. 



„ 9. — P. spinosa d'Orb. sp. 



Figs. 3, 4, 5 x 50 diam. ; the others x 100 diam. 



