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PYGURUS. 



Pygurus Hausmanni, although the great depression of the test in both these species pro- 

 duces a close resemblance between them. 



Locality and Stratigrapliical position. — This large species has hitherto been found in 

 England, only in the Coralline Oolite, at Malton, Yorkshire, and always in the thick 

 bedded limestones of that formation, associated with Clypeus subulatus, Cidaris florigemma, 

 Echinobrissus dimidiatus and Collyrites bicordata. 



In France it has been collected, according to M. Cotteau, in the " Calcaires a Astartes 

 de l'Aube," at the environs of Longchamps, by M. Royer, and at Polisot by M. Leymerie ; 

 M. d'Orbigny states that it is found in the " etage corallien " of Tonnerre, and Thury, 

 (Yonne). 



In Germany it was collected by Koch and Dunker* in the " Oberen Korallenkalk/" 

 at Kleinenbremen, near Biickeburg, associated with Astrea? fieliant/ioides, Goldf., 

 A. agaricites, Goldf., Terebratula lacunosa, Schl., and Cidaris Bhmenbachii, Munst. 



History. — This large urchin was described and figured in 1837 for the first time by 

 Koch and Dunker ; it has been subsequently described by M. Cotteau, and mentioned in 

 the different works enumerated in the synonyms of this species. 



* Beitrage des Norddeutch Oolithgebirg, p. 38. 



