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 /* long and the projecting spine 300-400 p. ; 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., 6, no. 19, p. 16. 

 Scotoplanes murrayi Theel, 1881. Challenger, Hoi., 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 

 Theel'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 six in the other. This specimen 

 is further remarkable for having contained a parasitic worm, apparently an Ich- 

 thyonema. 



