ACTINOPODOUS HOLOTHUMOIDEA. Hg 



that Maeenzeller's specimens were youug, and similar differences 

 m the simpe of tables can be observed in SUd^opus japonUm 

 accordmg to age (see Mitsukuei 1897«), I think the sin^^le point 

 jnst mentioned hirdly justifles the estabhshment of a distinct 

 species. 



I should like to point out one fact which is of some interest 



Among tl,e liolothnrians of the " Siboga "-Expedition, SLunEE dis- 



covered a specimen of II. monacana dredged from a depth of 275 



meters. Among specimens of the same species from the Salami 



feea there are four from a depth of 110 fathoms or about°220 



meters, while many specimens are daily obtained by fishermen 



from a depth of only 25 fathoms or even less so that the vertical 



distnbution of the species appears to range down to a moderately 



great depth. It is somewhat strange that no specimens have boon 



reported either from Liu-Kiu or Formosa, but this nmy be due 



snnply to msufficient exploration. 



The dorsum is distinctly divided from the ventrum The 

 former is provided with papilte, the latter with pedicels. On 

 the dorsum exist also large tubercles which, though low when 

 contracted, in the fully extended state are of a conical shape and 

 termmate in papiU». The tubercles are in six rows : one at the 

 edge of the dorsum on each side, and two on each of the dorsal 

 radn. On the latter the tubercles are sot alternately in the two 

 rows. There are about 17-20 tubercles in each row. They may 

 be about 1 cm. in diameter at base, and 7-8 mm. hi.di when 

 extended. All papilla, end bluntly, so that they probably contain 

 end-plates. 



On the ventrum tliere is often, but not always, a median line 

 devoid of pedicels. There may be present, with or without this 

 median cle^r space, two lateral clear spaces which divide the 



