ACTIXOPODOUS HOLOTHUKIOIDEA. Ill 



some, consisting almost exclusively of delicate filigree -like rosettes 

 (a). 



Anns with five groups of small papilla?. Shields of tentacles 

 somewhat dark. 



This is one of the commonest and at the same time most 

 ambiguously defined species. Almost every writer differs materi- 

 ally from others in characterizing some of the important features. 

 This is probably due to the fact that this species is evidently a 

 very extensive one, presenting many forms of variation, which 

 different authors have seized for their respective descriptions. Also 

 some of these phases may have been described as different species. 

 Thkel goes so far as to think — with much show of reason 1 be- 

 lieve — that H. marmorata, H. argus, H. vitknm, H. tennissima, H. 

 köllikeri, H. démens, II. similis are probably only young or varie- 

 ties of one, or at the most, of two or three species. Of this, 

 however I shall have more to say at anotlier place. 



Locality : — Mauritius (Haacke '80, Ludwig '83, Théel '86) ; Mjotte 

 (Sluiter '95) ; Andaman Is. (Bell '87); Tuticoriii, Madras (Bell '88); Ni- 

 cobar Is. (Semper '67 — 8) ; Batavia (Sluiter '95); Pulo Edam (Ludwig '88); 

 Insel Edam, Bai von Batavia (Sluiter '87) ; Insel Noordwachter (Sluiter 

 '87); Cocos Is. (Sluiter '95); Java (Selenka '67) ; Celebes (Jaeger '33, 

 Lampert '85) ; Boliol, Philippine Is. (Semper '6 7 — 8) ; Zebu (Laivipert '85) ; 

 Ogasawara Is. (Semper '67 — 8) ; Aml)oina (Ludwig '82, '88, Sluiter '94, 

 '95) ; Ualan, Caroline Is. (Brandt '35) ; Fiji Is. (Semper '67—8); Geelvink 

 Bay (Ludwig '82); Great Bamer Reef (Ivent '93) ; South Sea ? (Lampert 

 '85); Pulu-Passi-Tanette (Sluiter : 01); Kwandang Bai, Pajunga I. (Sllti^er 

 : 01) ; Sonana Bai (Sluiter : 01); Timor (Slufter : 01); Roma (Sluiter 

 : 01) ; Okinawa I. ; Ton-es Strait. 



