198 K. 3IITSUKURI : STUDIES ON 



small or middling in size, 0.08 — 0.13 mm. in diameter, with 8 — 

 10 spokes and 3 — 5 central holes (c). Small wheels on the dor- 

 sal papillaj and lateral pedicels have 10 — 15 spokes and 4 — 5 

 central holes, the diameter measuring 0.052 — 0.108 mm. (d). 

 Cruciform bodies are found in the dorsal and ventral perisome 

 and are four-, three-, or sometimes five-radiated, with several ir- 

 regular teeth on the ends of the arms (_/"). They measure 0.18 

 — 0.14 mm. in diameter. Spinose spicules (e) are found only in 

 the dorsal and ventral perisome but none in the appendages. 

 They vary from 0.15 to 0.20 mm. in length. End-plates and sup- 

 porting rods (g) are found at the ends of the lateral pedicels. No 

 calcareous bodies are found in the cloacal wall or peritoneum. 

 In tlie genital tubes there are slender bent spicules with teeth 

 (h). 



On the outer surface of this animal, a hydroid colony with 

 an extensive network of hydrorhiza with hydroid polyps arising 

 from the nodes was sometimes observed. 



Locnllti/ -.—"ChiiWcnger" Stat. 1(34 find 235 (Theel '82); "Iviiiglit 

 EiTciut " Stixt. 4 (between Faros Is. Jiiid Scotlnml) (Theel '82) ; " Siboga " 

 Silt. 314 and 178 (Sluiter : 01) ; " TaUsman " Dr. 13, 31, 45, 48, 49, 84, 85, 

 93 and 121 (Perkier : 02) ; Sagami Sea. 



Genus Ilyodaemon Thkel 1879. 



In the description given of /. ijimai (MnavKvni 1897/>, p. 133), 

 I emphasized the fact that in that new species dichotomously 

 branched bodies are wholly lacking ; hence the last part of the 

 description given by Theel (1882) sliould read " Integument with 

 numerous wheels, sometimes also with dichotomously branched 

 bodies." After a closer study, I am inclined to make some more 



