6 HJ. THEEL, PRELIMINARY REPORT ON THE HOLOTHURIDA. 
ring one another completely or with their edges alone; every 
plate rising toward its middle into a large, conical knob. 
Colour in alcohol, light gray. 
Length, 130 mm. 
Breadth, 98 mm. Ä 
Station 216, 2000 fathoms, two specimens. 
The other specimen, much smaller, 75 mm. long, differs 
slightly from the above described, the pedicels being twenty-six, 
thirteen along each side of the ventral surface, and the posterior 
pairs being very small. 
Oneirophanta !) gen. nov. 
Back highly convex; ventral surface flat. Mouth anterior, 
subventral; anus posterior, ventral. ”Tentacleés twenty, large and 
retractile at their ends alone. The lateral ambulacra of the tri- 
vium with large pedicels, slightly retractile at their ends alone, 
disposed in a double row all along each side of the ventral sur- 
face, 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. Bi- 
vium with processes, resembling those of the trivium, disposed 
in a single row all along each of its ambulacra. Processes not 
forming transverse rows or very indistincet ones. Integument 
with crowded, irregularly rounded, perforated plates, often pro- 
vided with minute processes, 
Oneirophanta mutabilis sp. nov. 
Plate I, Figs. 4—6. 
Body of almost equal breadth throughout, more than twice 
as long as broad. Tentacles with- 6—8 small, unbranched, digi- 
tate, retractile processes. Pedicels nineteen along each side of 
the ventral surface, ten in the outer and nine in the inner row, 
and on the posterior part of the ventral surface moreover eight, 
very small, one on each side of the anus, and the six others 
behind it, in a nearly transverse row; pedicels of the outer row, 
1) övevoopuvta, a Vision. 
