ACTINOrODOT'S HOLOTHURIOIDEA. 



173 



black. The pedicels in the former parts arc closely set in three 

 zones, while in the latter they are markedly more sparse : in this 

 part, the middle zone presents an irregular double row of them, 

 while in the lateral zones they are very much reduced in number, 

 or one or both of the lateral zones are entirely absent. The 

 posterior third therefore presents a striking appearance. It will 

 be rcrnemliered that very much the same thing was described for 

 Stichopus naso Sempee, which however narrows toward the anterior 

 end and not toward tlie posterior as in this species. 



Color of the tentacles reddish brown. Polian vesicles six. 

 Calcareous ring as indicated in textfig. 30 a., resembling that of 

 S. variegatus Seiipeh, S. naso Sempee, etc. It is oblique, the 

 posterior prolongations of the radialia becoming longer dorsally. 

 Stone -canal attached to the 

 mesentery, much meander- 

 ing. 



Calcareous deposits : ( i ) 

 C-shaped bodies of various sizes, 

 measuring 0.052 — 0.144 mm., 

 and frequently bent a little at 

 the center (c,/). (ii) Rosettes 

 very numerous, much smaller 

 than C-shaped bodies [d). (iii) 

 Tables delicate, slender ; disk 

 small, 0.02 mm. in diameter ; 

 spire 0.032 mm., 12 or more 

 toothed, teeth spreading out- 



Textfig. 30. 



SlichofAts osMmti! : a — Cnlcnrcous ring ", 'i. c — 

 Tables; d — Rosette; e, /— C-shnpcd Ixxlies. (^ — 



ward and reminding one of a /x400). I-Ic.terr.'ic1ialin;Emv— Jli.lvonlml mai- 



nlin ; ErJ — Eight dorsil mdinlia ; Erl— Eiglit 



stag's horn (A, c). Mcna mdmli,. 



Femarhs : — All the specimens were obtained in 1 — 3 fathoms 



