Similar to Conulus albogalerus, only much more rotund.  This species is common in the Turonian, but is found throughout the White Chalk, except for the latest Campanian.

A        B        C

1).  Conulus subrotundus (x2, New Pit Chalk Formation, Beachy Head, Randell Collection, RR1586).  (A) Apical (upper) surface, anterior (front) end at the bottom of the image.  (B) Lateral (side) view, anterior end at left of image.  (C) Oral (under) surface, anterior end at the bottom of the image.  The central opening is the peristome whilst he posterior opening (top of image) is the periproct.