FOSSIL FAUNA. 129 



PLATE LV. 



Fossil Sea-Urchins, or Echinites. 



Fig. 1. The shell of a Turban Echinite (Cidaris sawatilis, of Parkinson)^ broken in two, and each 

 piece imbedded in the same fragment of flint. From Kent. 



Fig. 2. A round Buckler Echinite {EcUnodiseus {Clypeaster) subrotundus, of Parkinson), from Italy. 



Fig. 3. The upper surface of an Echinite {Spatangites (Disaster, of Agassiz) omlis, of Parkinson) ; 

 from Scarborough. 



Fig. 4. View of the upper, and fig. 5, of the lower surface of an Echinite, {Spatangm 

 {Hemipneaster, of Agassiz) radiatus, of Parkinson,) from the cretaceous strata of St. 

 Peter's Moimtain, Maestricht. 



Fig. 6. A small Echinite {Echinites {Nucleolites, of Leske) pyriformis, of Parkinson), from the 

 cretaceous strata of Maestricht. 



Fig. 7. A small Echinite of a different genus {Echinites (Cassidulus, of Lamarck,) Zapis cancri, of 

 Parkinson), from Maestricht. 



Fig. 8. An Echinite ( Spatangites {Nucleolites) brissoides ovalis, of Parkinson). Locality unknown. 



Fig. 9. A beautiful specimen of a large heart-shaped Echinite of a recent species (Spatangus 

 purpureus), from a modern tertiary deposit, Malta. 



Fig. 10. An Echinite {Echinodiscus {Clypeaster) laganum, of Parkinson), from a tertiary deposit, 

 Verona. 



Fig. 11. This Is a very abundant Spatangus or heart-shaped echinite, {Spatangus cor marinum, of 

 Parkinson ; Cor testudinariim, of Goldfuss ; Micraster cor anguinum, of Agassiz,) in 

 the chalk of Kent, and some parts of Sussex. Siliceous casts, forming cordiform 

 flints, with deep imprints of the pentapetalous rays on the vertex, are common 

 among the stones of the ploughed fields of the Downs. 



Fig. 12. A Spatangite, {Spatangus {Micraster, of Agassiz) lacunosus, of Parkinson), from tertiary 

 strata, Malta, 



