18/9.] MR. F. J. BELL ON THE ECHIjMOIDEA. 657 



published a short essay entitled ' Observations sur les progres re- 

 cens de l'histoire naturelle des Echinodermes;' and there, on its 

 seventh page, we find these words : — " Dans un travail encore inedit sur 

 les especes vivantes de l'ancien genre Echinus, travail que je me pro- 

 pose de publier prochainement, j'ai etabli les coupes suivantes, dont 



je me bornerai a. citer ici les types ; Tripneustes (E. ventri- 



cosus)" I do not think that there is any need to particularize 



such a method of detailing the history of a name in a work which is 

 entitled a ' Revision ; ' but I have thought it right, while giving an 

 account of Prof. Alex. Agassiz's method of working out his subject, 

 to give all the material necessary for other naturalists, who desire to 

 investigate for themselves the'matter in question. That there was 

 some good cause for confusion is evident from the fact that no less 

 eminent a naturalist, and careful a writer than Prof. E. von Martens 

 put out the synonymy thus : — "Tripneustes, Ag. 1847; Hipponoe, 

 Gray, 1841 ; non Hipponoe, Audouin et Milne-Edwards, 1834 

 (Annelid) " '. It will now be possible to write the synonymy thus: — 



Tripneustes, L. Agassiz, 1841 : p. viii of preface to Valentin's 

 Anat. du genre Echinus. Hipponoe, Gray, 1855 : P. Z. S. 1855, 

 p. 36. Heliechinus, Girard, Proc. Boston Soc. of Nat. Hist. iii. 

 p. 364 (fide Agassiz) 2 . 



Having now dealt at an almost wearisome length with the vexed 

 and vexatious question of the name proper to this genus, it is time 

 to pass to the consideration of the species of which it is made up. 

 In the 'Revision' three are recognized: — T. depressus, A. Ag., T. 

 eseulentus, Leske (this appears to be the correct name for E. ventri- 

 cosus, Lamk.); and T. variegatus, Leske. I now come to some 

 observations on the specific name variegatus ; and I will put them 

 briefly thus : — 



(1) The name variegatus is never used by any writer on the 

 genus Tripneustes subsequent to Leske and prior to Alex. Agassiz. 



(2) The names synonymous with it in the opinion of Prof. 

 Agassiz, sardica and angulosa, are also used by Leske : the former 

 has been applied by Lamarck, de Blainville, Des Moulins, L. Agassiz, 

 and Dujardin and Hupe, among others ; while angulosa has been 

 used by de Blainville, and by Dujardin and Hupe. 



(3) The order in which these forms are described' will be shown 

 by stating the pages on which they are found : — Cidaris angulosa, 

 p. 92 ; Cidaris sardica, p. 146 ; Cidaris variegatus, p. 149 4 . 



It is obvious that the name which must be used is angnlosus ; as 

 to the other synonyms given by Agassiz in his list, they all appear 

 to include forms which belong to this somewhat variable and widely 

 distributed species. 



The first species of the three, depressus, which has been found on 



1 Archiv fur Naturges. xxxii. p. 160. 



2 Cf. Desor, ' Synopsis des fichimdes fossiles,' Paris, 1858, p. 132. 



3 Additamenta ad KLeinii dispositionem Echinoderinatum. N. G. Leske. 

 Lipsiae mdcclxxviii. 



1 Variegata is stated (Kev. Ech. p. 135) to be described on p. 85 of Leske's Ad- 

 ditamenta : p. 85 is occupied by part of the description of T. saxatilis ; and the 

 word variegata is not to be found on it ! 



Proc. Zool. Soc— 1879, No. XLII. 42 



