244 



THE VOYAGE OF H.M.S. CHALLENGER. 



Nearly all the Temnopleuridse- 



Teimiojileurus. 

 Pleurechinus. 

 Microcyphus. 

 Salmacis. 



Mespilia. 



Amhlypneustes. 



Holojyneustes. 



And of the Trij^lechiuidse only a few species of Echinus are left, while Hemip)edina, 

 Phymosoma, Toxopncustes, Hipponoe, and Evechinus have no representatives. 



All the littoral Clypeastridae have disappeared from among the continental species 

 with the exception of those having a wide bathymetrical range (^). There is not a single 

 typical continental species belonging to either — 



'^ Echinocyaiims. 

 ^Fibularia. 



Clypeaster. 



Echinanthtis. 



Laganum. 

 ^Peronella. 

 ^ Ecliinarachnius. 



Arachnoides. 

 Echinodiscus. 

 ""Mellita. 

 Astriclypeus. 

 Rotida. 

 Encope. 



Among the Petalosticha the following genera are missing : — 



Echinonetis. 

 ■^ Echinolampas. 

 Rhynchopygus. 

 Echinohrissus. 

 Nucleolites. 

 Anochanus. 

 Platyhrissus. 

 Maretia. 

 Lovenia. 

 Breynia. 



Palceostoma. 

 Tripylus. 

 '^Brissopsis. 

 Brissus. 

 Metalia. 

 Meoma 

 Linthia. 

 Faorrda. 

 Moira. 



The follo-ftdng genera are rejjresented by different species in the littoral and in the 

 continental bathjTnetrical ranges : — 



Dorocidcms. 



Goniocidaris. 



Asthenosoma. 



Echinus. 



Spatangus. 



Echinocardium. 

 Rhinobvissus. 

 Agassizia. 

 Schizaster. 



