5. Holothurioidea. 305 



anterior part, ov with a single very large one , resembling a broad , branched or 

 nubrauched lobe, and near to it some small papillae. No respiratory trees. Inte- 

 gument naked, spiculous, or plated. 



Die neuen Gattungeu dieser Ordnung werden folgendermafien characterisirt : 

 Deima u. gen. : Back highly convex ; ventral surface flat. Mouth anterior, 

 ventral, anus posterior, ventral. Tentacles small, perfectly retractile, about 

 twenty (?) . The lateral ambulacra of the trivium with large pedicels , slightly 

 retractile at their ends alone , disposed in a single row all along each side of the 

 ventral surface, and with another series of highly elongated, conical, rigid, not 

 retractile processes , placed externally and above the pedicels all along each side 

 of the body and directed straight outwards. The odd ambulacrum naked. Bivium 

 with processes, resembling those of the trivium, disposed in a single row all along 

 each of its ambulacra. Processes forming transverse rows , more or less distinct. 

 Integument with crowded, irregularly rounded, perforated plates. 

 Deima validum n. spec. ; D. fastosum n. sp. 



Oneirophanta n. gen. : Back highly convex ; ventral surface flat. Mouth ante- 

 rior, sub ventral ; anus posterior, ventral. Tentacles twenty, large and retractile 

 at their ends alone. The lateral ambulacra of the trivium with large pedicels, 

 slightly retractile at their ends alone , disposed in a double row all along each 

 side of the ventral surface, and with another series of highly elongated, conical, 

 more or less flexible , not retractile processes , placed externally and above the 

 pedicels all along each side of the body. The odd ambulacrum with a few more 

 or less rudimental pedicels. Bivium with processes, resembling those of the tri- 

 vium, disposed in a single row all along each of its ambulacra. Processes not for- 

 ming transverse rows or very indistinct ones. Integument with crowded, irregu- 

 larly rounded, perforated plates, often provided with minute processes. 



Oneirophanta nmtabilis n. spec. 



Orphnurgus n. gen. : Back convex ; ventral surface almost flat. Mouth anterior, 

 terminal subventral ; anus posterior, terminal, slightly dorsal. Tentacles twenty. 

 The lateral ambulacra of the trivium with very large not retractile pedicels, dis- 

 posed in a single row all along each side of the ventral surface, and with another 

 series of slender, very flexible , for the most part apparently rectractile processes 

 placed above the pedicels all along each side of the body. The odd ambulacrum 

 naked. Bivium with a crowded series of numerous processes , resembling those 

 of the trivium , apparently disposed in two rows all along each of its ambulacra. 

 Integument with spicula of various forms, but destitute of wheels." 



Orphnurgus asper n. spec. 



Cryodora n. gen. : Back highly convex; ventral surface almost flat. Mouth 

 anterior, subventral; anus posterior, terminal, subdorsal. Tentacles fifteen. The 

 lateral ambulacra of the trivium with large, slightly retractile pedicels, disposed 

 in a single row all along each side of the ventral surface. The odd ambulacrum 

 naked. Bivium with slender, flexible, not retractile processes, disposed in a 

 single row all along each of its ambulacra. Integument spongy without calca- 

 reous deposits. 



Cryodora spongiosa n. spec. 



Laetmogone n. gen. : Back highly convex; ventral surface slightly so. Mouth 

 anterior, terminal, subventral ; anus posterior, terminal, slightly dorsal. Ten- 

 tacles fifteen. The lateral ambulacra of the trivium with large , not retractile, 

 only a little contractile pedicels , disposed in a single row all along each side of 

 the ventral surface. The odd ambulacrum naked. Bivium with highly elongated, 

 flexible, cylindrical, not retractile processes , disposed in a single row all along 



Zoolog. Jahresbericht 1&79. 20 



