Q6 
BULLA constricts. 
TAB. CCCCLX1V.— % 2. 
Spec. Char. Subcvlindrical, contracted in the 
middle; vertex truncated, perforated; base 
obscurely striated; aperture linear, ex- 
panded at the base. 
Three times as long as wide ; the superior flattened 
part of the whorl is not so broad as in the last, the aper- 
ture is also, more linear, except near the base, where it is 
very wide. 
Sent from Barton, by the Rev: Mr. Btngley. 
1 
BULLA elliptica. 
TAB. CCCCLX1V — Jig. 6 
Spec. Char. Elliptical, elongated, transverse- 
ly striated ; vertex perforated ; aperture 
widest at the base. 
The form of this Bulla is a very regular ellipsis, the 
two extremities being equally rounded ; the length is two 
and a half times the breadth; the striae are very fine, 
rather most distant near the base. 
Not unfrequent at Barton, varying from one to three 
lines in length. 
