Recent and Fossil Foraminifcra. 437 



140. Uvigerina mnralis Terqtiem. 



Uvigerina muratis Ttrqueni, 188*2, Mem. Soc. Geol. France, set. 3, vol. 2, 

 Mem. III. p. 119, pi. xii. figs. 26-9. 



Fossil. We have found a good many specimens of this rather 

 striking type, all of which are in agreement with the figures 27, 

 28, and 29 in Terquem's monograph. Terquem describes and 

 figures two distinct forms under this name, one having a rough 

 surface and with the earlier chambers arranged biserially, the other 

 having a smooth surface and a consistently uvigerine arrangement. 

 It appears probable, however, from the figure and description, that 

 the rough surfaced specimens are a distinct form. 



The specific name muralis very well describes the appearance 

 of the form, the chambers of which look like rounded pebbles 

 imbedded in a wall. Terquem's description also refers to this 

 appearance of the shell, "formee des loges irregulieres . . . 

 agglutinees comme des petites pierres." 



Terquem's specimens were from the Eocene of the Paris basin. 

 He does not state whether they occur with frequency or otherwise. 



141. Uvigerina selseyensis sp. n. 



(Plate XVIII. figs. 1-3.) 



Several fossil specimens. This handsome form presents appear- 

 ances intermediate between IT. angulosa (Williamson) and V. 

 porrecta (Brady). It differs from U. angulosa in that the later 

 chambers, which are triangular in shape, are set spirally around 

 the central tube, as in U. porrecta, from which, however, it differs 

 in the absence of the strongly marked costre which ■ characterise 

 that species. The basal edge of each of the later chambers is 

 strongly concave, whereas in U. porrecta the basal edge is convex. 

 Length 0'4 mm., greatest breadth, 0*2 mm. 



EXPLANATION OF PLATE XVIII. 



Fig. 1. — Uvigerina selseyensis sp. n. 

 „ 2.— Ditto. 



,, 3. — Ditto. Oral aspect. 

 ,, 4. — Globigerina pachyderma Ehrenberg sp. 

 „ 5.— Ditto. 



,, 6. — Spirillina selseyensis sp. n. Superior surface. 

 ,, 7. — Ditto. Inferior surface. 

 ,, 8. — Discorbina cristata sp. n. Superior surface. 

 ,, 9. — Ditto. Inferior surface. 

 ,, 10.— Ditto. Side views. 



All figures x 100 diam. 



