BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. De. N:0 19. 13 
Achlyonice !) gen. nov. 
Back highly convex; ventral surface filat or almost concave. 
Mouth anterior, ventral; anus posterior, dorsal. Tentacles twelve. 
The lateral ambulacra of the trivium with more or less retrac- 
tile pedicels, disposed in a single row all along each side of 
the ventral surface. The odd ambulacrum naked. Bivium with 
a few very soft and flexible processes in its anterior part alone. 
Integument thick, spongy, destitute of calcareous deposits. 
Achlyonice ecalcarea sp. nov. 
Plate" I; Figs: 8& 
Body ovate, widening behind, about twice as long as broad. 
Tentacles of equal size; their terminal part very large, discoidal, 
with small, retractile processes at its edge. Pedicels thirteen 
along the left side of the ventral surface, and fourteen along the 
right one. — The two specimens we have had to examine being 
much dilacerated on the back, it has been impossible correctly 
to determine the size as well as the position of the processes of 
the bivium. Integument very thick, soft, spongy, and as it were 
porous. 
Colour in alcohol, light gray, inclining to green. 
Length, about 100 mm. 
Breadth, about 50 mm. 
Station 241, 2300 fathoms, two specimens. 
Elpidia THÉrL. 
Mémoire sur V'Elpidia, K. Sv. Vet.-Akad. Handl. Bd 14, N:o 8, 1877. 
Body ovate, more or less elongated, sometimes cylindrical. 
Mouth anterior terminal or subventral, anus posterior, terminal, 
subventral or subdorsal. Tentacles ten. The lateral ambulacra 
of the trivium with large, slightly retractile pedicels, disposed 
in a single row along each side of the ventral surface. The 
odd ambulacrum naked. Bivium with one or a few pairs of 
often very elongated, not retractile processes on each of its am- 
1) dyklus, darkness. 
