273 



"We see no reason for separating this form from that figured 

 under the name of C Bradiana, from the Richmond boring. 

 Hingement, like that of pi. i., fig. 2. 



This character of ornament, ridges with intermediate rows of 

 pits, is figured also in Cijlhere Jurinei, Miinstcr, by G. S. Brady, 

 Trans. Zool. Soc, vol. v., 1866, p. 372, pi. lix., fig. 1. 



Five examples from the Blue Fullers-earth Clay, Midford. 



59. CYTHERIDEA FULGURATA, sp. n. 



PI. iv., figs. 12 a, b, c. 



Sub-obovate, convex, with straight but oblique dorsal and 

 ventral margins ; rounded and lipped in front, and angular, 

 broadly lipped, and depressed behind. Surface smooth, and 

 bearing two longitudinal, slightly curved ridges in the ventral 

 region, and several minor oblique ridges, irregular, but radiating 

 from the middle of the dorsal, towards the ventral region. 

 Hingement, as in pi. i., fig. 2. 



Four examples from the Blue Fullers-earth Clay, Midford ; 

 and two or three examples from the Bradford Clay, Bradford. 



60. CYTHERIDEA EXIMIA, sj). n. 



PI. v., figs. 5 a, b, c. 



Oblong, with obliquely rounded ends ; straight dorsal, and 

 slightly sinuous ventral margin. Both extremities have a 

 depressed rim. Surface very convex, especially in the posterior 

 region ; finely punctate, and also pitted with scattered shallow 

 pits. Edge view, lanceolate. End view, broadly ovate, almost 

 circular. The hingement is the same as in pi. i., fig. 2. 



One specimen ; Yellow Fullers-earth Clay, Midford. 



