176 K. MITSUKUEI : STUDIES ON 



shaded papillae ; in alcohol, uniform grey with slightly darker 

 papillae. Pedicels in three longitudinal bands, the middle band 

 twice as broad as the lateral band. Scattered among these 

 pedicels numerous dark spots which look indented. These are 

 probably small pedicels or papillae. At the lateral edges large 

 conical papillae in a row, 7— 10 mm. in height, 17 or 18 in 

 number. Smaller papillae of various sizes scattered all over the 

 dorsal surface, the tallest of these being very much smaller than 

 the lateral papillae. In specimens observed in life, some of the 

 taller of these dorsal papillae were arranged in a more or less 

 irregular double row along each of the two dorsal ambulacral 

 lines. Smaller papillae were scattered all over the dorsal surface. 

 In some specimens, these smaller ones were more or less in a 

 straight line along the lines of the taller papilla^ (dorsal ambula- 

 cral), so that longitudinal lines of black dots were noticeable, 

 especially when contracted. In other specimens no such arrange- 

 ment could be observed. Around the sub ventral mouth, a crown 

 of tentacles, surrounded by a membrane fringed with 25 or more 

 medium- sized papillae, these being more conspicuous on the dorsal 

 and lateral parts and rudimentary on the ventral part of the 

 membrane. Anus terminal, subdorsal, with some large papillae in 

 the neighborhood. 



Genital bundles two. Stone- canal attached to the mesentery. 

 Madreporic body as usual, near the opening in the mesentery 

 opposite the middorsal interradial piece of the calcareous ring. 

 Polian vesicles variable in number. In one (No. 1054) there are 

 four, of which one is large, two middle-sized, and one small. In 

 another (No. 1053) only one. In a third (No. 1332) two large 

 vesicles united at the base into a single tube. Calcareous ring as 

 given in textfig. 31a. Both radial and interradial pieces of the 



