REPORT ON THE HOLOTHTJRIOIDEA. 
145 
EaUtat.—ChiM (Selenka, Semper, Ludwig), Peru (Selenka, Semper), Paita and Callao 
(Verrill). 
(Mus. Holm.) One individual, 110 mm. long, dredged at Iquique. Colour brownish ; 
tentacles darker. Tentacles nineteen, unequal, but in an irregular manner. 
Pedicels equally distributed all over the body. Excepting terminal plates in 
the pedicels, no deposits seem to be present. A single madreporic canal and 
numerous Polian vesicles. Each of the strong retractors appears as if it were 
composed of several distinct hands. 
III. Deposits of the body- wall itself in the shape of tables. 
1. Calcareous ring often simple pieces, the radial not prolonged posteriorly. 
Thyonidium pellucidum {Holothuria), Fleming, 1828 ; Dliben and Koren, 1844. Cucu- 
maria hyalina, Forbes, 1841. Fentacta pentactes, Oersted, 1833, Thyonidium 
hyalinum, Liitken, 1857. (?) Thijonidium conchilegum, Pourtales, 1868 and 
1869. 
Tables rather scattered, excepting in the cervical portion of the body, where they are 
crowded, consisting of a regular, round, perforated disk with nine to twelve 
peripheral holes, and a spire built up of three to four rods terminating in 
spines and connected by a transverse beam near the top. 
Habitat . — Scandinavian coasts from Einmark to the Sound (Sars, Storm, Diiben and 
Koren, Ludwig, Liitken, Mobius and Biitschli, Danielssen, &c.), Arctic Sea north 
from Norway (Hoffmann), Mohn Bay (Heuglin), Spitzbergen (Ljungman), White 
Sea (Jarzynsky), British Islands (Hodge, Fleming, Eorbes, Norman), North 
Atlantic Ocean, north of Shetland, at a depth of 1081 fathoms (Danielssen 
and Koren), Florida Reef (Pourtalfes). 
(Mus. Holm.). Several specimens from the west coast of Sweden. One fidly typical 
individual may be described. Length, 55 mm. Body-wall white, shghtly 
transparent, the five muscular bands being visible through it. Tentacles twenty, 
typical. Besides a double row of pedicels along the ambulacra, the inter- 
ambulacra bear pedicels which, scattered without order on the dorsal surface, 
seem to be placed more or less distinctly in longitudinal rows on the ventral 
interambulacra. Anus surrounded by pedicels, distinguished from the true 
pedicels by having a very rich covering of irregular, reticulate, calcareous 
bodies, thus forming a transition to anal teeth. Even anteriorly on the body, 
the pedicels are supported by such irregularly perforated plates, though not so 
abundantly. On the rest of the body, the pedicels have,' excepting terminal 
plates, none or a few supporting plates, but no rods. The tables, very thinly 
scattered, excepting at the cervical portion, where they are more aggregated, consist 
of a rather large perforated disk supporting a spire composed of three or four 
rods, one transverse beam, and terminating in several, sometimes as many as twelve 
(ZOOL. CHALL. EXP. PART XXXIX. — 1886.) Qq 19 
