1-28 
THE VOYAGE OF H.M.S. CHALLENGEK. 
scales across the whole breadth of the dorsal surface is fourteen to sixteen. 
Between mouth and anus ten to twelve larger and several smaller scales may 
be found. The scales slightly granulated. Deposits in the sole — rather 
symmetrical oval buttons with about four holes and rather large knobs round 
the uneven margin, and with a larger central knob ; smaller, asymmetrical, 
knobbed, irregularly perforated bodies with the margin uneven and dentate. 
Habitat . — Samboangan (Semper). 
P solus boholensis, var. pandanensis, Semper, 1868. 
Body probably Ascidia-shaped. Lateral series of pedicels composed of two to three 
rows ; the odd series composed of one or two rows. Number of scales across the 
dorsal surface, ten to twelve ; between mouth and anus ten to twelve larger and 
several smaller scales are present. Deposits of the sole — asymmetrical plates 
with uneven margin, pierced with a few holes and provided with some small 
knobs; smaller asymmetrical plates with a few holes and dentate or spinous 
margin. 
Habitat . — Bohol and Pandanon (Semper). 
B. Pedicels on the two lateral ambulacra alone ; odd ambulacrum naked or with an 
incomplete series of pedicels. 
1. Dorsal integument covered with scales. 
P solus boholensis, Semper, 1868. 
Body Hsc-ic^m-shaped, with the anal portion conical. Lateral series of pedicels 
composed of two to three rows ; odd ambulacrum with an incomplete series of 
pedicels, its middle being naked. Dorsal surface with fifteen to sixteen scales 
across its breadth, and twelve to thirteen between mouth and anus. Deposits 
of the sole almost like those in the preceding variety. 
Habitat . — Bohol (Semper). 
P solus fabricii {Cuvieria),J)dbeTi and Koren, 1844; Liitken, 1857; Kingsley, 1881; 
Ludwig, 1881; Bell, 1882, Holothuria squamata,Y&h^ems,,17?>(). {VjAscidia 
squamata, Pallas, 1788. Cuvieria sitchaensis, Brandt, 1835. Cuvieria 
squamata, A. and E. C. Agassiz, 1865 (according to Verrill). Lophothuria 
fabricii, Verrill, 1866. Psolus sitchaensis, Semper, 1868, 
Body depressed, (7AtYo«--shaped, its periphery presenting an oval form. Lateral series 
of pedicels composed of two to five rows ; anteriorly and posteriorly the odd 
ambulacrum carries some pedicels. Dorsal surface covered with large imbricating 
scales, with the free margin rounded and tightly covered with large granules. 
