BIHANG TILL K. SV. VET.-AKAD. HANDL. BAND. 5» N:O 19. 17 
transverse ridge between the two ambulacra, and immediately 
behind this ridge another pair of rudimental processes. Inteoument 
very thin, soft and transparent, with small, light papille, scat- 
tered on the back; calcareous deposits of two sorts: large, straight, 
spinous spicula; and small ones, arcuate and much more nu- 
merous. 
Colour in alcohol, light gray. 
Length, 56 mm. 
Breadth, 34 mm. 
Station 325, 2650 fathoms, one specimen. 
Elpidia elongata sp. nov. 
Plate II, Figs. 34—35. 
Body elongated, cylindrical, several times longer than broad. 
Mouth anterior, subterminal; anus posterior, dorsal. Tentacles of 
equal size; their terminal parts bearing numerous, small, retrac- 
tile processes. Pedicels eight along each side of the ventral 
surface, and behind the anus an unpaired one, flat and twice 
as broad as the others, having the obtuse end incised in its 
middle; the two or three posterior pairs flat, broader and longer 
than the others. Bivium with a few small papille in its an- 
terior part. Integument rather thick, with a few calcareous de- 
posits, composed either of four long, smooth, arcuate arms di- 
rected towards the inside of the body and one central large 
process directed outwards, or of unbranched spicula. 
Colour in alcohol, light gray. 
Length, about 150 mm. 
Breadth, about 25 mm. 
Station 299, 2160 fathoms, one incomplete specimen. 
Obs. Only a single specimen having been at our disposal, 
and that one so incomplete as to render a detailed examination 
impossible, I think it best, at least for the present, to refer 
it to Elpidia, although it evidently differs very much from the 
other species ot that genus. 
