430 Transactions of the Society. 



119. Cristellaria cultrata Montfort. 



Robulus cultratus Montfort, 1808, Conchol. System., vol. i. p. 214, 54 e genre. 

 Robulina cultrata (Montfort) d'Orbigny, 1826, Ann. Sci. Nat., vol. vii. p. 287, 



No. 1 ; Modele No. 82. 

 Cristellaria cultrata (Montfort) Brady, 1884, Forarn. 'Challenger,' p. 550, 



pi. lxx. figs. 4-8. 



Fossil. The specimens are rare, and present both the rnegalo- 

 spheric and microspheric forms. They are small, but well de- 

 developed and typical. 



Sab -family 3. Polymorphininae. 

 Polymorphina d'Orbigny. 



120. Polymorphina lactea Walker and Jacob sp. 



Serpula lactea Walker and Jacob, 1798, Adam's Essays (Kammacher's ed.) 



p. 634, pi. xiv. fig. 4. 

 Polymorphina lactea (typica) (pars) Williamson, 1858, Eecent Foram. Gt. 



Britain, p. 70, pi. vi. fig. 147. 

 Polymorphina lactea var. communis Williamson, ibid. p. 72, pi. vi. figs. 153-5. 

 Polymorphina lactea (Walker and Jacob) Brady, Parker, and Jones, 1870, 



Trans. Linn. Soc. Lond., vol. xxvii. p. 213, pi. xxxix. figs. 1 a-c. 

 Ditto. (Walker and Jacob) Brady, 1884, Foram. ' Challenger,' p. 559, pi. lxxi. 



figs. 11, 14. 

 Ditto. (Walker and Jacob) Brady, 1887, Synopsis British Recent Forami- 



nifera. 



Fossil and recent. Eecent specimens frequent, fossil specimens 

 abundant, characterised by the same diversity in (1) source of 

 origin, (2) size, (3) shape or rotundity, as in the closely allied species 

 P. gibba ; indeed, with many of the specimens it is difficult to say 

 to which form they should be referred. In such a collection of 

 varying specimens it is possible to build up a series linking the 

 two forms. 



121. Polymorphina oblonga Williamson. 



Polymorphina lactea var. oblonga Williamson, 1858, Eecent Foram. Gt. 



Britain, p. 71, pi. vi. fig. 149. 

 Polymorphina oblonga (Williamson) Brady, Parker, and Jones, 1870, Trans. 



Linn. Soc. Lond., vol. xxvii. p. 222, pi. xxxix. fig. 7 a, b. 

 Polymorphina lactea var. oblonga (Williamson) Brady, 1887, Synopsis British 



Recent Foraminifera. 

 Polymorphina lactea var. oblonga (Williamson) Millett, 1903, Journ. B. Micr. 



Soc, p. 262, pi. v. fig. 5. 



Recent and characteristic, but rare. The specific name, P 

 oblonga, has been previously used by d'Orbigny for an elongate 

 variety which has really no definite specific value, but presents 

 characteristics allied to d'Orbigny' s P. problcma and P. communis. 

 In view of the well-marked and constant features presented by 



