ACTINOrODOl S IlOLOTliriUOlDKA. 



()7 



niari,'iu and parily si)iiiy. 'I'lu' disk is. as dcsci'ihcd liy TiiKEt,, 

 iiiosLlv with a, riii'j; and an opt'iiin^ at. tin' hasc^ iif cacli pillar. 

 In otlicrs, csix'cially in lliusc witli a spiny niai'Ljiii, the disk may 

 become hu'ije and liaxc nun'c liolcs. i^Vncstrutcd plates may bo 

 simply X-sluijied ov nun-f claliorate. 



Stone-canals and I'olian vesicles vary gi'cally in iinm! cr 

 as the followiiiL: lalilc will show : — 



Calcareous rinir as shown in Icxllii;'. II. 



The above facts seem lo jioint to tlie 

 (.'onchision I hat there is no distiiu^tion between 

 J/, (ih'ii and var. imilidincii^is. 

 Textfiq 14 J^''"' '"""li'l^ '"'t-' i'ouiul ill shallow water 



Ilolotlmrin ntrn: Calca- ['■^ — '■'y fatllOms). 



rcoiis ring. i-intorra,ii- ] |^.^.^.,. ,„, specimen cinvd for market, bnt 



nlia ; U — Railinlin. 



this is one of the cominei'cially iisi'fiil s[)ecies 

 as given l)y SF.:Mn;i;. Ki'.xr, iVc. 



LocaUiji : — (^u(;riiiil);i, (Skmi'KK '(^!)t; \\v:\ Sen- (Si;mi'I'.i; '(!it, J.iinviCt 

 '80, Lampkht '85); Ass;il) ([.rnwr; "sTi; Zanzibar (^Sklknk.v '(!7, liAMranT 

 '85, LuDWK} 87); Bawi, Tmiiliabi ( riA.Mn:i;r '!)(!); AliL-ihi-.i iLruwit; "DO); 

 M<>z;iiubii(ius (Bkll '84i; Darros J., Amiraiito Is. ( l5jXT, '8i) ; Wtsstwii 

 JiKliau Ocean (Bki.L "84); ('(sylua (LuDWp; '87, Bixi, 87); Tuiicoriu, IVIaikas 

 (.Bkll '88) ; Amiiunau Is. (Bkll 87) ; ^■icol)a^• Is. (SkmI'KK '07— '68) ; I-:l- 



