from Japan and the Indian Ocean, 89 



dislinguislictl from all known members of tlie genua lies in 

 tlie jHculiar nrrangement of the jtiimary tubercles," says 

 Yosliiwara. In A. variitm, however, the arran;^emeiit of the 



Iirimary tubercles is very similar (co;np. fi<^. 2 «, pi. 50, of 

 )oelerlcin," Echinoideavon AmboinaiiiulThursday Ishuid" "). 

 The essential distin<Tui.sliing ciiaraclers of thi^J very distinct 

 species are found in the ]>edicellariiii and spicules, and the 

 non-ringed ]irimary actinal spines. The little developed, not 

 annuhii ly constricted bag ot skin on the abaetinal spines is aii 

 additional, though prubably less reliable, character. 



A. ijimai in its general appearance resembles the otli':;r 

 8)iecies of the genus, with the conspicuous covering of tiie 

 aljaefinal sidjj by close-set, ringed, almost equally sized, skin- 

 clad spines. 



3. Calveria gracilis (Ag.). 



Asthniosoma rp-acile, Agajsiz, 18S1, ' Challengrer ' Eehinoidea, p. 80, 



pi. xvii. a. figs. 1-4. 

 Aftheiionoiua longi/fpinum. Yosliiwara, 1897, op. n't. p. 5, pl.ii. fijrs. ]-7. 

 Ca'ieriii yracilis, Th. Morteii^cn, ll'OS, ' Iiii^olf J'^i-liiiioid'a, p. 61, 



pi. xiii. tig. 3 ; de Meijere, U>04, ' Sibo{ia ' Echiuoidea, p. 34, Taf. xiii. 



tig. 152. 



'Jho " AsiJunoscma Jongisjiinvm " of Yosliiwara so closely 

 agrees with Calveria (/raciliti {A fr.) that 1 cannot lind a single 

 character by which to distinguisii it from t'lat species, with 

 uhieh, accordingly, it must bs regarded as synonymous. Jt 

 is only to be remarked that in the type specimen of Agassiz 

 some violet jialches are found on the actinal side, which is 

 not the case in the s| ecimens before me. 'J'he colour is dark 

 red, almost cbrifct- coloured ("vinosus'') in the one specimen, 

 lather pale, but of the same tint in the other. 



This sp(ci(S is very closely rcdated to C. hystrix; tlie only 

 distinct diflerence 1 can find is the colour, which is always 

 bcautilully red ("ruber") in C. hystrix. 'i'he tubercles of 

 ihe outer interambulacral |)Iatcs of the actinal side are rather 

 more numerous than in hystrix, as pointed out by Agassiz, a 

 rot very prominent f«ature. \n the pediceliaria? no distinct 

 differences are found. The chief peculiarity, indeed, lies in 

 the gcograj)hical distribution of the two species. \( both 

 Mere found together they would certainly be regarded, at most, 

 only as varieties of one species. 



To the description given by Yosliiwara a few corrections 

 must be made, 'i'he larger of the primary ambulacral plates 

 are stated to "consist of three pieces ajiposed together in a 



• SerLon's ' Fcr.Hluir.p-r' i (II.' ^•. irr? : .T, r T'<iil.-'"!i! \iii. 



