AcriNoroDous holothurioidea. 115 



iliat Marenzeller's spocimons were young, and similar (lifTercnecs 

 in the shape; of tables can be observed in Stlcliopus Juponlcus 

 according to ago (see Mitsukuei 1897rt), I think the single point 

 just mentioned Inrdly justifies the establishment of a distinct 

 species. 



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

 ^Vmong the holothurians of the " Siboga "- Exited ition, Sluiter dis- 

 covered a specimen of //. monacavia dredged from a depth of 275 

 meters. Among specimens of the same species from the Sagami 

 Sea there arc; 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 

 distribution of the species appears to range down to a moderately 

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

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

 simply to insullicient exploration. 



The dorsum is distinctly divided from the ventrum. The 

 former is provided with papilla?, 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 

 terminate in papilla?. The tubercles are in six rows : one at the 

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

 radii. On the latter the tubercles are set 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. high when 

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

 end-plates. 



( )n the ventrum there is often, but not always, a median line 

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

 median clear space, two lateral clear spaces which divide the 



