This genus is best known from the Albian Gault Clay of SE England, from which it can be collected with a degree of frequency.  A very small number of specimens have been collected from the Grey Chalk, of SE England.  Notopocorystes possesses a longitudinally elongate carapace (longer than broad), broadest towards the anterior, slightly tapered towards the posterior, and ornamented with lateral spines. 

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1).  Notopocorystes - well preserved specimens from the Grey Chalk; (A) Notopocorystes normani - a complete carapace retaining the right cheliped - an exceptionally preserved specimen (x2.0, Dover, BMNH (British Museum (Natural History) London) 44346); (B) Notopocorystes sp. - a complete but slightly distorted carapace (x3.3, Sussex?, Potter Collection, Booth Museum, BMB 011208, by kind permission of John Cooper).  Image (A) © 2008 The Natural History Museum, by kind permission.

2).  Notopocorystes (Cretacoranina) cf. schloenbachia - Isolated carapace of a form with relatively subtle ornament (x3.0, Bridgewick Pit, near Lewes, Turonian, Booth Museum, BMB 018478, by kind permission of John Cooper).

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B

3).  Notopocorystes - Frontal views; (A) Notopocorystes normani - complete carapace retaining the right cheliped (x3.0, Grey Chalk, Dover, BMNH (British Museum (Natural History) London) 44346); (B) Notopocorystes sp. - a complete but slightly distorted carapace (x4.4, Sussex?, Potter Collection, Booth Museum, BMB 011208, by kind permission of John Cooper).  Image (A) © 2008 The Natural History Museum, by kind permission.

4).  Notopocorystes normani - Left lateral view of a complete carapace retaining the right cheliped (x2.5, Grey Chalk, Dover, BMNH (British Museum (Natural History) London) 44346).  Image © 2008 The Natural History Museum, by kind permission.