190 THE FOEAMINIFERA 



ance in various Tertiary deposits, such as the London 

 Clay (Eocene), the ' Clavulina ' beds of Budapest 

 (Eocene), the Miocene of the Vienna basin, and the 

 Phocene of Kar-Nicobar. It is also known from 

 recent soundings, but it is very rare, and apparently 

 confined to the Indian Ocean. Tertiarij to Beceiit. 

 (Plate 10, fig. H.) 



Genus LinguUna, D'Oebigny. 



Test straight, compressed ; aperture typically a 

 narrow fissure. Permian to Becent. 



Example. — L. semiornata, Peuss, ' Sitz. d. k. Ak. 

 Wiss. Wien,' vol. xlvi. pt. i. 1862, p. 91, pi. xii. 

 figs. 11 a, b. 



The chief features of the genus are well seen in 

 this example ; the compression of the nodosarine 

 chambers affects the oral aperture, which is thereby 

 modified as a terminal slit. 



L. seiniornata is almost confined to the Gault 

 formation, and it was from a specimen of English 

 Gault clay sent to Prof, von Eeuss by Prof. Kupert 

 Jones that the original examples w^ere described. It 

 has lately been met with in the Aptian beds of 

 Surrey. Cretaceous. (Plate 10, fig. J.) 



Genus Frondicularia, Defkance. 



Test compressed or complanate, segments shaped 

 like an inverted Y, equitant ; primordial chamber 

 distinct. Permian to Becent. 



Example. — F. ParJceri, Eeuss, ' Sitzungsb. d. k. 



