32 
THE ENTOMOSTRACA OE 
No. 4. Cytherella (?) appendiculata, nohis. Tab. VI, fig. 21 a,h. 
INCH, 
Length, Jg- 
Height, TjrL Gault, Folkstone. 
Thickness, 
Carapace-valve (right) somewhat ohlong ; irregularly gibbous ; nearly straight 
above, incurved below. Anteriorly flattened, and obliquely rounded ; posteriorly 
tapering and produced into an obtuse point ; hoth extremities furnished with a slight 
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 wfith a single valve only of this species, and that unfortunately 
has been since broken. 
No. 5. Cytherella (?) Mantelliana, nohis. Tab. VI, fig. 22 a — c. 
INCH. 
Length, 3-V 
Height, y-g Detritus, Charing. 
Thickness, 
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 ; cmterior compressed oval. 
One closed carapace from the Charing Detritus is the only example we have yet 
seen of this speeies. 
This species is named in compliment to Dr. Mantell, wdiose geological researches, 
especially in the Cretaceous Formation and its Microzoa, are universally known and 
appreciated. 
