Campylostoma matutiforme (Bell, 1858)

Campylostoma matutiforme is a rare crab found along some of the London Clay sites. These sites include Hampton Pier, Herne Bay, Elmley, Tankerton, Aveley Number 2 Pit, Steeple Bay, Maylandsea, Butt Cliff and Sheppey. 

Campylostoma matutiforme has been recorded at the divisions: B1, B2, C, D, and E. 

Campylostoma matuiforme is extinct and its closest living relatives are from the section Raninoida. 

Description: Carapace rounded, weakly tumid in both sections; three anterolateral spines increasing in size posteriorly, the fourth spine at the lateral angle (invariably broken off) produced to over half the carapace width, curving downwards as growth advances (see Collins, 1961, pl. 12, for figures of juveniles); subcarinate; transverse row of seven tubercles behind the front.

(Description from: A guide to the fossil Decapoda (Crustacea: Axiidea, Anomura, Brachyura) of the British Isles)