REPORT ON THE HOLOTHORIOIDEA. 
215 
alcohol, greyish-brown, speckled with light grey ; ventral surface lighter, and 
pedicels yellowish-brown. Three Polian vesicles and a single free, slender 
niadreporic canal, 20 mm. in length. The interradial pieces of the calcareous ring- 
are comparatively narrow. The scattered tables have their disks reduced to a 
simple ring, which, however, contrary to what is indicated in the figure given 
by Selenka, is often provided with spines ; their spire terminates in twelve large 
teeth. The circles of small fenestrated plates present themselves to the naked 
eye as very minute white spots. The papillse have a very rudimentary terminal 
plate and slightly curved, almost smooth rods, with the ends enlarged and per- 
forated. Excepting a well-developed terminal plate, the pedicels contain very 
few such rods, which sometimes are transformed into perforated plates. 
Holothuna pyxis, Selenka, 1867. 
Pedicels ( = papdlge ?) equally distributed all over the body, situated on conical 
warts. The disks of the tables more developed than in the preceding forms, 
with about twelve teeth or spines on the margin, arranged in groups of three, 
and with a peripheral circle of holes round the centre ; the spire terminates 
in twelve teeth. The fenestrated plates like those in the preceding forms, but 
not collected in circles. 
Habitat. — Java (Selenka). 
Holothuria inornata, Semper, 1868. 
Dorsal surface with papillae ; ventral surface with pedicels. Deposits entirely like 
those in Holothuria pyxis. 
Habitat. — Mazatlan (Semper). 
I am much inclined to consider the two latter forms as being very nearly related to 
one another, as well as to Holothuria atra, &c., though it may be observed 
that Holothuria pyxis differs from all the rest by its uniform papilla-like 
ambulacral appendages. 
Holothwia mexicana, Ludwig, 1875. 
Pedicels scattered all over the body. Deposits resembling those in Holothuria atra, 
though the fenestrated plates are more symmetrical and regulaily formed. 
Habitat. — Mexico (Ludwig). 
(Mus. Holm.) Two specimens, one 200 mm. long, dredged at St. Bartholomew, and the 
other, 2.30 mm. long, brought home from Guadaloupe. Colour dirty 5 ellowish- 
grey, slightly darker on the back, which is marked with dark brown hregulai 
spots. ’ The brown pedicels are equally large and uniformly distributed. Body- 
wall thick, leathery. Of the crowded plates two types may be observed, one 
more rounded, pierced with minute and commonly more numerous holes ; and 
the other irregularly rectangular, with fewer and larger holes. Two bundles 
of numerous madreporic canals (as many as twenty), wnth pear-shaped ends 
