80 
VIVIPARA concinna. 
TAB. XXXI. —Figs. 4 and 5. 
Spec. Char. Shell rather conical; volutions four 
or five; slightly convex; lower part rather 
angular. 
Lines of growth indistinct, surface smooth; length three* 
fourths of an inch. 
This has the convex contour of the spire less distinct than 
the last, and is rather angular in the lower part of the 
whorles. The spire is also rather shorter and pointed, con- 
sisting generally of about four whorles. I am favoured 
with it from a somewhat sandy part of the strata of Barton 
Cliff, by Mrs. Tylee. 
VIVIPARA suboperta. 
TAB. XXXI .—Fig. 6. 
Spec. Char. Volutions five, convex, with a de- 
pressed line along the upper part; a little 
wrinkled, outer lip folding partly over the 
upper part of the aperture. Shell about twice 
the length of the aperture. 
• 
^pire acute, surface flatfish, smooth, three quarters of an 
inch long. 
This specimen ought perhaps to have been reserved for 
another plate, as we are rather doubtful whether it belongs 
to the genus Vivipara ; it was sent me by Mrs. Cobbold, 
from the estate called Holywells, near Ipswich* 
