112 
THE VOYAGE OF H.M.S. CHALLENGER. 
Cucumaria canescens, Semper, 1868. 
Body elongated, slightly swollen at the middle. Radial pieces of the calcareous ring 
with two long posterior prolongations. Body-wall thick. Deposits — ^tables con- 
sisting of an elliptical disk with eight or nine ovate swellings round the margin, 
and with a strong central spire formed by two rods ; opposite to the spire is 
a roundish knob. In the internal layer of the perisome a simple knob is 
substituted for the spire, the deposits thus presenting the appearance of buttons. 
Habitat. — Bohol, Pandanon (Semper). 
2. Pedicels in two or three rows along each ambulacrum ; also more or less 
closely scattered ones on the two ventral inter ambulacra, the arrange- 
ment in rows being there more or less indistinct. 
Cucumaria longijpeda, Semper, 1868. 
Body pentangular, tapering posteriorly and anteriorly. Pedicels very long, in two or 
three rows along each ambulacrum, and, besides, a few on the two ventral 
interambulacra. Deposits — tables consisting of a roundish perforated disk and 
a spire composed of four rods, and one transverse beam. Radial pieces of the 
calcareous ring composed of a main part and two narrow separate posterior 
prolongations, each made up of two joints. 
Habitat. — Bohol, Pandanon (Semper). 
Cucumaria conjungens, Semper, 1868. 
Body cylindrical, rounded anteriorly, tapered posteriorly. Ventral pedicels numerous, 
irregularly dispersed over the ambulacra and interambulacra; dorsal pedicels 
only confined to the ambulacra, where they form two to three rows. Radial 
and interradial pieces of the calcareous ring composed of several smaUer parts, 
the former with two long articulate posterior prolongations. Deposits — tables, 
resembling buttons, with an oval knobbed disk perforated by a few (four) holes, 
and with a very short spire with two points. 
Habitat. — Mariveles, Bay of Manilla (Sqmper). 
3. Pedicels in a double row along the ambulacra, and also scattered ones 
on both dorsal and ventral interambulacra. 
Cucumaria hdllikeri. Semper, 1868. 
Body ascidiform. Tentacles of equal size. Interambulacral pedicels smaUer than the 
ambulacral. Deposits — roundish knobbed buttons with a few holes ; and more 
