ECHINOIDEA. II. 



123 



to be given, if tlie name Atiiphidcfiix can not be retained, wliicli seems not impossible, though 

 Agassiz (Rev. of Ech. p. 15) thinks it could iu)t be retained, as it is a synonym of Echinocardium 

 Gray — but of Eclunocarduim in its later modified sense. — These are, indeed, so disagreeable changes 

 in nomenclature that I will not propose to make them, the more so as so eminent authorities as 

 Prof. Ludwig and Dr. F. A. Bather, before whom I have put the whole question, are of opinion 

 that it is not absolutely needed. I will then retain the names in the sense in which the)' are used in 

 «Revision of Echini», but I fear it is not in accordance with the strict rules, and I, tor my part, sincerely 

 regret that Agassiz, who has traced the history of these names and given it fully in his most ex- 

 cellent Chronological List in the « Revisions, did not make these changes in the nomenclature on that 

 occasion. It might have been done at that time without causing much trouble. To now change Moira 

 to Echinocardium or Schizastcr, and Schizastcr in its present sense to Ova or even to Spatangus^ would 

 not fail to cause a great deal of confusion. 



The genus Schizasfci' should then be thus subdivided: 



Subgen. Parastcr Pomel. Test not verj- high. Petals and frontal ambulacrum much deepened, 

 apical system posterior; four genital pores. (Globiferous pedicellarise unknown.) 

 Species: gibberidtis Ag., Savigiiyi Fourtau. 



Subgen. Sc/iizasfer s. str. (Syn. A^iiia Gray). Test very high; petals and frontal ambulacrum 

 much deepened; apical system posterior; two genital pores. The globiferous pedicellarisc with a circle 

 of teeth round the terminal opening. 



Species: canali/cnts (Link.), laciiiiosits (L.), orbignyaniis A. Ag., Edwardsi Cott. 



Subgen. Tripylastcr Mrtsn. Test low; petals and frontal amljulacrum not much deepened; apical 

 system subcentral; three genital pores. Globiferous pedicellarirc with four teeth round the terminal 

 opening. 



Species: Philippii Gray. 



Subgen. Brisastcr Gray. Test low; petals and frontal ambulacrum not mucli deeiDeued; apical 

 system posterior (or subcentral); three genital pores. iTlobiferous pedicellariae with a single large tooth 

 at the point of the valves at one .side of the terminal opening. 



Species: fragilis (Diib. Kor.), capcnsis Stud., RIosclcyi A. Ag., lafi/roiis A. Ag., Touwscndi A. Ag., 

 antarctictis Doderlein. 



28. Spatangus purpureus O. F. Miiller. 



PI. II. Figs. S, 12, 14, 16. PI. XVI. Figs. 1—2, 5—10, 22, 24—25, 27, 29, 31—32, 34. 



Synonyms: Spatangus nicridionalis Risso. 



— spinosissimus L. Agass. 



— Regina Gra)'. 



I Lambert: Description des Echinides fos,siles de la province de Barceloua. Mem. Soc. geoL de France. IX. 1902. 

 p. 55. Note. 



16* 



