69 
TEREBRATULA hemispherica. 
TAB. DXXXVI.—fig. 1. 
Spec. Cuar. Hemispherical with a produced in- 
curved beak, longitudinally striated ; strize very 
numerous. 
; 
Tse lesser valve of this is nearly flat ; it is a little un- 
dulated : the stri@ are in fact minute plaits, and give a 
finely toothed margin to the valves, which is otherwise 
even. 
Found at Ancliffe. We are indebted to the cabinet of 
the Rev. G. Cookson for it. 
TEREBRATULA rigida. 
TAB. DXXXVI.—/ig. 2. 
Spec. Cuar. Orbicular, plaited ; plaits granulated, 
increasing. in number towards the margin ; 
lesser valve nearly flat, the other convex, with 
a small beak. 
A weLi-pDEFINED species, with an even front and small 
circular aperture in the beak. 
Only one specimen of this little shell has come with- 
in our observation: it was found in the Chalk near 
Norwich. 
TEREBRATULA striatula. 
TAB. DXXXVI.—/igs. 3, 4 & 5. 
Spec. Cuar. Imperfectly bilobate, compressed, lon- 
gitudinally ovate and striated ; front truncated, 
sometimes with a sinus ; strie granulated, re- 
peatedly forked. 
‘Syn. Terebratula striatula. Mantell, Geol. Sussex, 
p. 131. tab. 25. figs. 7, 8, & 12. 
Born valves of this Terebratula have generally a lon- 
gitudinal depression near the front, although some spe- 
