228 
THE VOYAGE OF H.M.S. CHALLEHGEE. 
Holothuria samoana, Ludwig, 1875. . 
Dorsal surface with papillae ; ventral surface with pedicels. The disks of the tables 
are rounded and smooth. The long conical spire is built up of four slightly 
spinous rods, and three to four transverse beams ; it terminates in four teeth. 
The rather large buttons are not very symmetrical, and are pierced with about 
fourteen holes. Tentacles twenty-five. 
Halntat . — Navigator Islands (Ludwig). 
2. Buttons never smooth, hut rough or uneven, owing to scattered or vnore densely 
crowded, minute, or rather large elevations, knobs or spines. In com- 
plete state they have two rows of holes. 
Holothuria sulcata, Ludwig, 1875. 
Pedicels all over the body. Disks of the tables small, nearly annular, spinous on 
the margin ; the short spire terminates in about twelve teeth. The buttons 
are mostly incomplete, of unequal size, and irregularly knobbed. On the 
ventral perisome the openings on the buttons are not unfrequently closed 
so that they resemble oval knobbed disks. 
Habitat . — West Indies (Ludwig). 
Holothuria occidentalis, Ludwig, 1875. 
Pedicels all over the body. The small but solid ' tables have the disks reduced and 
spinous, and the short spire terminating in four groups of three teeth each. The 
oval or oblong buttons have four to ten holes and numerous small knobs ; 
they are often incomplete. 
Habitat . — West Indies (Ludwig). 
Several characters mentioned by Ludwig in his diagnosis seem to confirm the near 
relation of this form to the preceding. Ludwig has had at his disposal only 
one specimen of each, so that a re-examination may be useful. 
Holothuria notahilis, Ludwig, 1875. 
Pedicels aU over the body. The tables in the ventral perisome have an irregular 
disk with spines on the margin, and a spire reduced to four spines ; on the 
dorsal surface the disks are larger and the spire more highly developed. The 
small oval buttons have six holes and several knobs. 
Hahitat . — Bowen (Ludwig). 
Holothuria helleri, von Marenzeller, 1877. Holothuria affinis, Heller, 1868. 
Dorsal surface with papillae situated on low warts ; ventral surface with pedicels 
mostly placed along the ambulacra. The disks of the tables are round. 
