IOO HALKYARD, Fossil Foraminifera of the Blue Marl 



Genus Uvigerina, d Orbigny. 



243. Uvigerina pygm^a, d'Orbigny.. 



Uvigerina pygmcea, d'Orbigny, 1826, Ann. Sci. Nat., vol. VII, 



p. 269, pi. XII, figs. 8-9. 

 Uvigerina pygmcea, Brady, 1884, Chall. Rep., p. 575, pi. 



LXXIV, figs. 11-12, elongate variety, figs. 13, 14. 



A common species and fairly distributed throughout the 

 Marl, but the specimens are only of moderate size. 



244. Uvigerina tenuistriata, Reuss. 



Uvigerina tenuistriata, Reuss, 1870. Sitz. k. Ak. Wiss.Wien. 



vol. LXII, Abth. 1, p. 485; v. Schlicht, Foram. Septar. 



Pietzpuhl, pi. XXII, figs. 34-37. 

 Uvigerina tenuistriata, Brady, 1884, Chall. Rep. vol. IX, p. 574 



pi. LXXIV, figs. 4-7. 



Rather rare, and only found in about half of the samples 

 of washings examined. 



(There are a few slender and typical examples but the 

 majority are only depauperate specimens of U. pygmcea.) 



245. Uvigerina tenuistriata, var. debilis, nov. 



Earlier portion of test similar to that of U. tenuistriata. 

 Last chamber, and sometimes the penultimate one, triangular 

 in transverse section. Length, .45 mm. 



This variety, of which a fair number of specimens have 

 been found, is a small and evidently weak form of its type* 

 diverging in the direction of U. angulosa, Will. It has gener- 

 ally been found in Gatherings in which U. tenuistriata does not 

 occur, or is, at any rate, very rare. 



(There does not appear to be much reason for the creation 

 of this new variety. Uvigerina, when present in material in any 

 abundance, is abnormally subject to variation, and to passage 

 forms between the species. Brady figures many_ such inter- 

 mediate specimens. (Chall. Rep. Pis. LXXTV— EXXV.) ) 



246. Uvigerina angulosa, Williamson. 



Uvigerina angulosa, Williamson, 1858, Rec. Brit. Foram., p. 



67, pi. V, fig. 140. 

 Uvigerina angulosa, Brady, 1884, Chall. Rep. vol. IX, p. 576, 



pi. LXXIV, figs. 15-18. 



Well characterised examples are frequent in nearly all the 

 washings examined. 



