ACTINOrODOÜS HOLOTHUKIOIDE A . 



229 



freie, kleine Steincanälchen und 4 Poli'sche Blasen. Die Saiig- 

 füssclien besitzen deutliche Ampullen. Geschlechts schlauche un- 

 getheilt ; Kloake durch zahlreiche Muskeln gehalten." (Selenka 

 1807, p. 355.) 



Remarks : — Body in many specimens kidney -shaped, dorsally 

 bent so that the ventral median line is longest. Skin hard and 

 coriaceous, with deep wrinkles. Color yellowish brown. Segments 

 of calcareous ring are each composed of many small pieces set 

 like a mosaic. Eadialia bifid, with long posterior prolongations. 

 Polian vesicles several (in one specimen eight) ; stone-canals and 

 madreporic bodies many, as repre- 

 sented in Selenka's Fig. 115. 



Calcareous deposits as in 

 Selenka's Fig. 116. Four-holed 

 buttons with knobs around the 

 margin, so that they look like a 

 pearl -necklace (textfig. 43 a,b), with 

 a second ring crossing the first at 

 right angles. End-plates imperfect. 

 Large four- or more-holed buttons 

 (c) present as supporting rods 

 around the ends of the pedicels. 



Locality /—Zanzibar (Selenka '67, Lampert '85, Ludwig '99) ; Boliol, 

 Canal von Lapinig (Semper '67^ — 8) ; Japan (v. jMarenzeller '81) ; Aden 

 (v. M.veenzeller '81) ; ToiTes Strait (Bell '84) ; Mozambique (Semper 'G9, 

 Théel '86) ; Java (Sluiter '87) ; West Coast of Salawatti (Sluiter '01) ; 

 Molo Strasse (Sluiter '01) ; Laljuan Badjo (Sluiter '01) ; " Siboga " Stat. 

 77 (Sluiter '01) ; Negombo, Ceylon (Pearson '03) ; S. of Kyüshü. 



Textfig. 43. 



Thyone sacellus : a, ?j— Fonr-holed, 

 kuobbetl buttons ; c — Perforated plate 

 of loedicel. ( x 400). 



