16 HJ. THEEL, PRELIMINARY REPORT ON THE HOLOTHURIDA. 
several small, digitate, retractile processes. Pedicels eight along 
each side of the ventral surface. Bivium with three pairs of 
small processes on the anterior part of the back, close-set in 
two rows, converging forward. Integument thin and transparent, 
with minute calcareous deposits, arcuate and frequently provided 
with small spines. 
Colour in alcohol, light gray or white. 
Length, about 16 mm. 
Breadth, about 5 mm. 
Station 50, 1250 fathoms, several specimens. 
Elpidia Murrayi sp. nov. 
Plate II. Figs. 23—25. | 
Body oval, about twice as long as broad; back highly con- 
vex. Mouth anterior, subventral; anus posterior, terminal. Ten- 
tacles of almost equal size; the middle ventral one a little smal- 
ler than the others; their terminal part provided with small, 
digitate, retractile processes. Pedicels short, five along each 
side of the ventral surface. Bivium with three processes, short, 
as long as half the breadth of the body or smaller, disposed on 
each of its ambulacra, one pair in the anterior, and both the 
others in the posterior part of the body; the hindmost pair 
rudimental. Integument brittle and glassy from numerous spi- 
cula, some small and in the form of a c, others large, unbran- 
ched, straight and very spinous. 
Colour in alcohol, glassy; back with a series of dark spots. 
Length, about 20 mm. 
Breadth, about 10 mm. 
Station 152, 1260 fathoms, one specimen. 
Elpidia papillosa sp. nov. 
Plate II, Figs. 31—33. 
Body ovate, about once and a half as long as broad. Mouth 
anterior, terminal; anus posterior, slightly dorsal.  Tentacles 
bearing at their terminal part numerous, small, digitate processes. 
Pedicels eight along each side of the ventral surface. Bivium 
with two small processes, placed side by side a little before the 
middle of the back and united by their bases, forming a low 
