ECHINOIDEA. II. 123 



to be given, if tlie name Aniphidctus can not be retained, whicli seems not impossible, though 

 Agassiz (Rev. of Ech. p. 15) thinks it conld not be retained, a.s it is a synonym of Echinocardium 

 Gray — bnt of EcJiinocardium. in its later modified sanse. — These are, indeed, so disagreeable changes 

 in nomenclature tliat I will not propose to niake them, the more so as so eminent autliorities as 

 Prof. Ludwig and Dr. F. A. Bat her, 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 they are used in 

 «Revision of Echini;, but I fear it is not in accordance witli 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 .Revision«, 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 Scliizastcr in its present sense to Ova or even to Spatangus^ would 

 not fail to causa a great deal of confusion. 



The genus Schizastcr should then be thus subdivided: 



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

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

 Species: gibbcnilus Ag., Savigiiyi Fourtau. 



Subgen. Scliizastcr s. str. (Syn. Nina Gray). Test very high; petals and frontal ambulacrum 

 much deepened; apical system posterior; two genital pores. The globiferous pedicellariæ witli a circle 

 of teath round the terminal opening. 



Species: canali/crtis (Lmk.), lacioiosiis (L.), orbignyamts A. Ag., Edioardsi Cott. 



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

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

 opening. 



Species: Philippii Gray. 



Subgen. Brisastcr Gray. Test low; petals and frontal ambulacrum not much deepened; apical 

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

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



Species: fragilis (Dub. Kor.), capciisis Stud., Mosclcyi A. Ag., latifrous A. Ag., Towiiscndi A. Ag., 

 antarcticus Dodei'lein. 



28. Spatangus purpureus O. F. Muller. 



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



Synonyms: Spatangus mcridionalis Risso. 



— spinosissivnis L. Agass. 



— Reginæ Gray. 



■ Lambert: Description des Échinides fossiles de la proviiice de Barcelona. Méni. vSoc. géol. de France. IX. 1902. 

 p. 55. Note. 



16* 



