This genera is relatively abundant in the sandy Grey Chalk-equivalent facies of SW England, and occasional specimens are also recorded from the Grey Chalk proper of Southern England.  The carapace is rounded with pronounced dorsal furrows and tubercles.

A

B

1).  Isolated carapaces of Necrocarcinus sp.  (A) Small carapace from the sandy Cenomanian facies of Wilmington, Devon, Randell Collection, RR 0647 (x4).  (B) Large carapace from the Grey Chalk, Glynde, Sussex, from the Willett Collection, Booth Museum, BMB 007783, by kind permission of John Cooper (x1.5).