ACTINOPODOrS HOLOTHUEIOIDEA. 



007 



Remarks : — My specimens on the whole agree well wdth the 

 description of Thkel. The largest sized one (No. 1082) measures 

 7.5 X 1..5cm. Body indistinctly pentagonal. Tentacles ten, the 

 two ventral ones smaller than the rest. Pedicels in double row 

 on each ambulacrum ; sometimes 3 — 4 rowed in certain parts, 

 but this condition is due probably to contraction. Polian vesicles 

 two. In one specimen, one of them is slender, and the other 

 vesicular ; in another, both vesicular. Stone-canal single, with a 

 distinct madreporic body. Greatest discrepancy from Thkel' s 

 description is presented by the calcareous ring. This is bilaterally 

 symmetrical (textfig. 46«) ; 

 the interradialia on both a /vTVi a A nj 



T» I I I I J V fin ,11 



sides of the mid -ventral 

 radialia are fused with 

 the latter, thus forming a 

 large piece exhibiting three 

 points anteriorly and two 

 prolongations behind. The 

 lateral ventral radialia on 

 each side of it has a single 

 point anteriorly and is pro- 

 longed posteriorly into two 

 long prolongations. The 

 two dorsal interradialia are 

 leaf -like witli a single point 

 forward, and are united to 



the posterior prolongations Cucmnaria cl.ronJ.jdna: «-Calcareoas ring; h- 



Ofadiacent radialia. The two Keticiilated elUpse: r-Simple perforated pMe ;(/. e- 



Elongfited plates. (h—z x 300). I— Right and left 



dorsal radialia are like the venfral interradLaia ; Ha— Left dorsal interradialm ; Imd 



T 1. -, , — Middoiftal interradiali'i ; R — Radiilii; Rmv— Midveiitral 



lateral interradialia, and the radiaiia. 



Textfig, 46. 



