110 K. MIT8UKURI : STUDIES ON 



ground color. 



The ambiilacral appendages are very numerous, being dis- 

 tributed all over the body without any regard to the ambulacra 

 or to the colored patches. The dorsal pedicels and many of the 

 ventral ones have the tip colored black in life, although this color 

 fades in alcohol. The pedicels all have well-developed end-plates: 

 those of the dorsal pedicels seem, however, to be on the whole 

 smaller than those of the ventral ones. The walls of the pedicels 

 have, mixed witli other calcareous bodies, supporting rods in the 

 shape of simple rods which may be more or less curved, with 

 their ends enlarged or slightly branched. They may attain a 

 length of 0.10 — 0.20 mm. The papillao that have been described 

 above as rising from the centre of the dorsal yellow patches are 

 conical and have no end-plates, or at the most very weakly de- 

 veloped ones consisting of a few meshes of calcareous network. 

 The papilla) have very numerous supporting rods. I am thus able 

 to confirm Theel's observations on this point. 



Calcareous deposits differ very much in the dorsal and ven- 

 tral perisomc. Those in the 

 ^^^^ ^^ ^^n^i r~ I ^^^tt^'i' î^igi'ce with the descrip- 



H^^ a "^ ^^ /^cvJ tion of Theel. They may be 



So H^ X-shaped (textfig. 216) or of 



a simple biscuit-like or ellip- 



Textfig. 21. 



soldai shape with or without 



Uololhurin marmonäa : a — Eosettcs ; h X- 



shapecl bodies ; c— Biscmts or oval grains. perforations (ü). BcsidcS thCSC 

 (x300). XI . . 1 



there exist more or less 

 highly developed rosettes. I am inclined to think that Semperas 

 figures (Taf. XXX., Fig. 10) probably represent some of the better 

 developed rosettes. The calcareous bodies in the dorsal perisome 

 are of a more gracile appearance than those in the dorsal peri- 



