192 THE FOEAMINIFEEA 



Geol. France,' ser. 1, vol. iv. 1840, p. 51, pL i. 

 fig. 25. 



The marginuline characters are well seen in this 

 species. The test in this genus is frequently ribbed, 

 as in the raplianus type of Nodosaria, whilst the 

 smooth forms are coinparable with the Dentalince 

 of the coinmunis section. 



M. raricosta was obtained by D'Orbigny from the 

 ChalJv of Meudon, France. (Plate 10, fig. M.) 



Genus Vaginulina, D'Orbigny. 



Test elongate, compressed or complanate; septa- 

 tion oblique ; aperture marginal. Lias to liecent. 



Example. — V. recta, Eeuss, ' Sitzungsb. d. k. Ak. 

 Wiss. Wien,' vol. xlvi. Abth. 1, 1862, p. 48, pi. iii. 

 figs. 14, 15 a, h. 



The Jurassic and Cretaceous species of Vaginu- 

 lina, are usually costate, and the above is a typical 

 example of such. The recent examples of the genus 

 are generally of the smooth type of shell. F. recta 

 was found by Reuss in the Gault Clays of North 

 Germany, and in that at Folkestone, whilst Berthelin 

 noted it from the equivalent strata in France (at 

 Montcley). It is also of frequent occurrence in the 

 Eed Chalk of Speeton. Higher in the series it 

 occurs in the Chalk Marl of Folkestone and else- 

 where. Cretaceous. (Plate 10, fig. N.) 



Genus BimuUna, D'Oebigny. 



Test resembling a thick, somewhat rounded, 

 Yaginidina ; septation very oblique ; aperture a 



