SK HI THÉEEL, PRELIMINARY REPORT ON THE HOLOTHURIDA. 
Orphnurgus !) gen. nov. 
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, disposed 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 retractile 
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 sp. nov. 
Plate I, Figs. 7 a—7 e. 
Body much elongated, of almost equal breadth throughout, 
several times longer than broad. ”Tentacles of almost equal size; 
one smaller than the others, with its terminal part torn off; ter- 
minal part of the tentacles with several retractile branched pro- 
cesses. Pedicels twenty-three along each side of the ventral 
surface, very large and long, except the posterior that are small. 
The only specimen in the collection being in the highest 
degree contracted and partly incomplete, it is impossible cor- 
rectly to state how the processes are arranged and distributed; 
I think, however, that the statement of its generic character agrees 
with reality. Processes very numerous, in all about two hun- 
dred, slender, cylindrical; the largest nearly as long as the 
breadth of the body. Integument hard and rough, with nume- 
rous, small, short spicula of various forms, some smooth, others 
provided with numerous large spines or processes. 
Colour in alcohol, light gray. 
Length, about 170 mm. 
Breadth, about 35 mm. 
Station 23, 450 fathoms, one specimen. 
!) öogvn, darkness. 
