Vol. 50.] MR. F. CHAPMAN ON THE BAEGATE BEDS OF SURREY. 715 



C. subalata, Eeuss, Sitzungsb. Akad. Wissensch. Wien, vol. xlvi. 

 (1862) pp. 76 & 93, pi. vm. fig. 10, pi. ix. fig. 1. 



C. megalopoUtana, Sherborn & Chapman, Journ. Roy. Micr. Soc. 

 ser. 2, vol. vi. (1886) p. 755, pi. xv. fig. 30 a, b. 



'This form has been found in Neocomian, Upper Cretaceous, arid 

 Tertiary strata. It is separated from the foregoing species by the 

 inflation of the test, especially in the umbilical region, and by the 

 perfect cristation of the peripheral edge. C. subalata was described 

 by Eeuss from the Speeton Clay and Ilinimus-Thon of North 

 Germany, and from the Gault of Folkestone ; it has also been 

 found in the Gault of Montcley, France (Berthelin). 



One specimen from the Pebble-beds, Littleton. 



97. Cristellaeia vaeians, Bornemann. 



C. varians, Bornemann, ' Liasformation von Gottingen,' 1854, 

 p. 41, pi. iv. figs. 32-34; Tate & Blake (1876), p. 466, pi. xvii. 

 fig. 27 ; Crick & Sherborn, Journ. Northampt. Nat. Hist. Soc. 

 vol. vi. (1891) p. 213, pi. i. fig. 30, & vol. vii. (1892) p. 70, pi. ii. 

 figs. 15, 16. 



Two specimens of this Liassic form were found in the Pebble- 

 beds, Littleton. 



Subfamily Poitioephisika 

 Polymobphina, d'Orbigny. 



98. POLYMOEPHINA AMYGDALOIDES, BeUSS. 



P. amygdaloides, Reuss, Sitzungsb. Akad. Wissensch. Wien, 

 vol. xviii. (1855) p. 250, pi. viii. fig. 84. 



A very typical, though small, specimen of the above was found 

 in the Pebble-beds, Littleton. 



99. Polymoephina soeoeia, lleuss, var. cuspidata, Brady. 



P. sororia, var. cuspidata, Brady, ' Challenger ' Rep. vol. ix. 

 (1884) p. 563, pi. lxxi. figs. 17-19, pi. lxxii. fig. 4. 



This variety was found in recent soundings by Dr. Brady, from 

 depths between 808 and 1443 fathoms. 



One specimen from the Pebble-beds, Littleton. 



100. Polymoephina gotta, d'Orbigny. 



P. (Pyrulina) gutta, d'Orbigny, Ann. Sci. Nat. vol. vii. (1826) 

 p. 267, no. 28, p. 12, figs. 5, 6 : Modele no. 30. 



This form has been recorded under the name of Pyrulina obtusa, 

 by Reuss, l from the Hils-Thon (Neocomian) of North Germany; 

 and it is also met with in other fossiliferous deposits of later date. 



Three specimens from the Pebble-beds, Littleton. 



1 Sitzungsb. Akad. Wissensch. Wien, vol. xM. pt. i. (1862) p. 79, pi. ix. fig. 9. 



