117 
NUCULA Palmae 
TAB. CCCCLXXV— ^g. 1. 
Spec. Char. Transversely elongated, very con- 
vex,, shining ; extremities rounded, equal ; 
beaks nearly central. 
Almost cylindrical with rounded ends; the lines of 
growth are sharply but irregularly marked, otherways 
the surface is smooth, shining and regularly convex. 
The beaks are partly broken away, but a compensation 
is made for their loss by the exposure of the hinge teeth. 
This is probably a very rare shell ; it is from Mr. Mar- 
tin’s collection of Derbyshire fossils, although not 
figured by him. 
NUCULA variabilis. 
TAB. CCCCLXXV— jfig. 2. 
Spec. Char. Transversely oval, elongated, some- 
times oblique, rather depressed, smooth ; 
beaks near one end. 
The form of this shell is very variable; it is sometimes 
very oblique ; but the beaks are constantly near the pos- 
terior extremity, which is generally rather less rounded 
than the other ; the greatest depth of the valves is near 
the beaks ; the lunette is neither impressed nor con- 
spicuous. 
An elegant and very distinct Nucula, although some- 
what related to N. similis (M. C. 192), which is very 
different in form. 
From the Ancliff collection. The small figures are 
of the natural size. 
