TROPICAL PACIFIC HOLOTHURIOIDEA. 133 
be made out; not even a calcareous ring was detected. Posterior end of body, 
flattened. Pedicels present around posterior end, but their number, size, and 
relative positions could not be determined. Calcareous particles character- 
istic; in skin of dorsal surface are quadriradiate spicules, each of the four, only 
very slightly thorny branches curved inward rather strongly, while from their 
common center arises an outwardly directed nearly smooth spine; the curved 
rods are 350-550 u long and the projecting spine 300-400 u; in the ventral 
skin, the spicules are smaller with less curved rods and two to four low, rough, 
projecting spines or knobs, much as in Peniagone intermedia. 
Station 4658. Eastern Tropical Pacific, 8° 30’ S., 85° 35’ 36” W., 2,370 fms. Bott. temp. 35.3°. Fne. 
gn. m., mang. nod. 
One specimen. 
It is by no means sure that this species is properly referred to Parelpidia 
rather than to Peniagone but the elongated form and the apparent absence of 
any dorsal appendage seem to justify the position given. The spicules of the 
dorsal surface are the really characteristic feature and will serve to distinguish 
even more badly preserved specimens than the holotype (Plate 3, fig. 3). Judg- 
ing from the colored drawing, made from life, there are only three pedicels on 
each side of the body and these are widely separated. There seem to be none 
around the flattened posterior end. 
Scotoplanes murrayi. 
Plate 3, fig. 6. 
Elpidia murrayi THEEL, 1879. Bih. K. Sven. Vet. Akad. Handl., 5, no. 19, p. 16. 
Scoloplanes murrayi THEEL, 1881. CHALLENGER, Hol., pt. 1, p. 34. 
The ALBATROSS specimens are all much larger than the holotype of murrayi, 
ranging from 55 to 85 mm., but there seems no good reason for considering them 
specifically distinct. The calcareous particles are actually larger than in 
Théel’s specimen but relatively they are about the same. The rods are 1-1.25 
mm. long and correspondingly stout; they are abundant; the C-shaped bodies 
are also very plentiful and relatively large. The skin is very thin and owing 
to the abundance of the spicules is quite brittle. The left-hand papilla in one 
specimen (Station 4672) is double. In the same specimen, there are only five 
papillae in one lateral series, though there are siz in the other. This specimen 
is further remarkable for having contained a parasitic worm, apparently an Ich- 
thyonema. 
