Vol. 50.] ME. E. CHAPMAN ON THE BARGATE BEDS OF SURREY. 713 



it occurs in nearly all subsequently formed fossiliferous deposits, as 

 well as in those of the present time. The recent forms are found 

 in shallow, to moderately deep, waters. 



Pour typical specimens from the Pebble-beds, Littleton. 



85. Cristellaria grata, Reuss. 



C. grata, Reuss. • Sitzungsb. Akad. "Wissensch. Wien, vol. xlvi. 

 (1862) p. 70, pi. vii. fig. 4. 



This form was originally described from the Neocomian beds of 

 North Germany. 



One specimen from the Pebble-beds, Littleton. 



86. Cristellaria cymboides, d'Orbigny. 



O. cymboides, d'Orbigny, ' Foram. Foss. Yienne,' 1846, p. 85, pi. iii. 

 figs. 30, 31. 



One very fine and perfect example of this Tertiary species was 

 found in the Bargate Pebble-beds, Littleton. 



87. Cristellaria l^vigata, Reuss. 



C. Icevigata, Reuss, Sitzungsb. Akad. "Wissensch. Wien, vol. xlvi. 

 (1862) p. 92, pi. xii. fig. 14. 



Reuss described this species from the Gault at Folkestone. 

 Three specimens from the Pebble-beds, Littleton. 



88. Cristellaria acutauricllaris (Fichtel & Moll). 



Nautilus acutauricularis, F. & M., 'Test. Micr.' 1803, p. 102, 

 pi. xviii. figs. g-i. 



C. acutauricularis, Brady, 'Challenger' Rep. vol. ix. (1884) 

 p. 543, pi. cxiv. fig. 17 a, b. 



Five specimens of this form, which occurs in various Secondary 

 and Tertiary deposits, were found in the Pebble-beds, Littleton. 



89. Cristellaria Bronni (Romer). 



Planularia Bronni, Romer, ' Yerstein. nordd. Kreidegeb/ 

 1840-41, p. 97, pi. xv. fig. 14. 



Cristellaria Bronni, Reuss, Sitzungsb. Akad. Wissensch. Wien, 

 vol. xlvi. (1862) p. 70, pi. vii. fig. 13. 



This species has been found in the Speeton Clay of North 

 Germany. 



One specimen from the Pebble-beds, Littleton, and one from the 

 Pebble-beds, Halfpenny Lane, Chilworth. 



90. Cristellaria oligostegia, Reuss. 



O. oligoster/ia, Reuss, Sitzungsb. Akad. Wissensch. AVien, vol. xl. 

 (1860) p. 213, pi. viii. fig. 8 ; and vol. xlvi. (1862) p. 93, pi. xiii. 

 %. 2. 



This species was found by Reuss in the detrital sand of the 

 Westphalian Chalk, and also in the Gault of Folkestone. 



One young specimen from the Pebble-beds, Halfpenny Lane, 

 Chilworth. 



