ACTINOPODOUS HOLOTHURIOIDEA. 



101 



it, is that referred to in Bell's description. In life the append- 

 ages are longitudinally elongated but in alcohol transversely elon- 

 gated, as described by Bell. This seems to be a difference due 

 merely to the state of contraction. 



There are three kinds of calcareous bodies. ( i ) Tables in a 

 very closely arranged layer (textfig. 20 h, c). They have a disk 

 with smooth margin. Around the large central opening there is a 

 very neat circle of small holes, ±12 in number. Of these the 

 four in the radii of the spire-pillars are often larger than the 

 others. The size of the disk 0.05 — 0.06 mm. The spire is built 

 of four pillars with one cross beam. The crown has ± 12 

 teeth, (ii) Buttons in a layer below that of the tables. Most 

 numerous are the regularly shaped buttons with three 

 pairs of holes {a). Some others show four or five pairs 



of holes. Some more or less crenate 

 in the margin, others not. Not un- 

 commonly the holes are asym- 

 metrically present in that either 

 one or more of them on one side 

 have run together, or one is altogeth- 

 er without a vis-à-vis on the op- 

 posite side. The buttons measure 

 0.06— O.OTGmm. in length. The 

 above tables and buttons must be 

 considered as agreeinir well with 



Textfig. 20. 



Ilolothurkt macleari : a — Calcareous 

 ring ; b, c— Tjibles ; d— Button ; e, f— 

 Small imperfect button.. (6-/x 300 . thoSC givCU lU BeLl's figUrCS. (iÜ) 

 I — Interradialia ; E— Radialia. 



Below the above mentioned two 

 layers, in the under skin, there are somewhat sparsely scattered, 

 much more minute buttons, only 0.02 — 0.036 mm. in size. They 

 are sometimes mere oval rings. (/), but more fi'equently show a 



