32 THE ENTOMOSTRACA OF 



No. 4. Cytherella (?) appendiculata, nobis. Tab. VI, fig. 21 a, h. 



INCH. 



Length, Jg- 



Height, TjJj- Gault, Folkstone. 



Thickness, -j-ig 



Carapace-vahe (right) somewhat oblong ; h'regularly gibbous ; nearly straight 

 above, incurved below. Anteriorly flattened, and obliquely rounded ; posteriorly 

 tapering and produced into an obtuse point ; hoth extremities furnished with a shght 

 marginal ridge ; central region of the valve bearing two curved, convex ridges, formed 

 by the irregularity of the surface ; each ridge beginning rather in front, and on either 

 side, of the centre of the valve, with a roundish boss, running backwards, and curving 

 one up and the other down, so as to leave an oval depressed space between them, and 

 almost meeting near the posterior extremity. 



The closed valves would present a profile somewhat fiddle-shaped. 



We have met with a single valve only of this species, and that unfortunately 

 has been since broken. 



No. 5. Cytherella (?) Mantelliana, nobis. Tab. VI, fig. 22 a — c. 



INCH. 



Length, J^ 



Height, -^ Detritus, Charing. 



Thickness, -yxs 



Carapace somewhat oblong, depressed. The surface of the valves marked with 

 about twenty longitudinal rows of punctations. Anterior extremity rounded ; posterior 

 obliquely rounded. Dorsal edge straight ; ventral incurved. A slight depressed margin 

 or lip, running round the edge of each valve, forms in the closed carapace a little 

 ridge or keel at the junction of the contact-margins of the valves. 



Dorsal aspect narrow acute oval ; anterior compressed oval. 



One closed carapace from the Charing Detritus is the only example we have yet 

 seen of this species. 



This species is named in comphment to Dr. Mantell, whose geological researches, 

 especially in the Cretaceous Formation and its Microzoa, are universally known and 

 appreciated. 



