134 
THE VOYAGE OF H.M.S. CHALLENGEE. 
Habitat . — Several localities between Texas and Cape Cod, viz., East Florida (Pourtalfes), 
West Florida (Verrill), Charleston (Selenka, Ludwig), Horth Carolina (Verrill), 
Sagharbor (Ayres), New Jersey (Lesueur, Pourtalfes, Verrill), Connecticut, 
Long Island, Thimble Island, Vineyard Sound (Verrill), Fort Macon (Coues 
and Yarrow), (?) Brazil (Eathbun, Verrill). 
(Mus. Holm.) Several specimens dredged at Wood’s Hole, Massachusetts, and New 
York. The largest 100 mm. or more in length. Colour in alcohol almost black ; 
pedicels brownish and their sucking-disks almost white. Anal teeth distinct. 
Pedicels very numerous and crowded. Deposits present only in the pedicels, 
consisting of terminal plates and a few tables, which have an elongated, fusiform, 
curved disk, with about four central holes and one or more at each slightly 
enlarged end ; the spire seems to be made up of four rods. In one of the 
specimens examined by me, two Polian vesicles and a single madreporic canal 
were ^ present. Calcareous ring rather large, with the sutures between the 
radial and interradial pieces visible, thus the ring does not form a continuous 
whole. 
It appears somewhat doubtful whether Thy one Iraziliensis of Verrill is to be 
referred to this species, its pedicels being less numerous, its calcareous ring 
smaller, and, according to Verrill, not so distinctly provided with posterior 
bifurcate prolongations. 
Thy one venusta, Selenka, 1868. 
Pedicels with terminal plates alone. Eadial pieces of the calcareous ring with long, 
slender, bifurcate prolongations posteriorly ; aU the ten pieces simple. 
Habitat . — Eed Sea (Selenka). 
2. Deposits in the shape of tables. 
Thyone fusus (Holothuria), 0. F. Miiller, 1788 and 1789; Keren, 1844; Dtiben and 
Keren, 1844. Holothuria penicillus, 0. F. Muller, 1788 and 1789. Holo- 
thuria papillosa, 0. F. Muller, 1789. Mulleria papillosa, Jehnsten, 1834. 
Thyone papillosa, Ferbes, 1841. Anaperus fusus, Treschel, 1846. {V) Holo- 
thuria scotica, Daly ell, 1851. Thyonidium pellucidum, Barrels, 1882. 
Tables not very close together, composed of an irregular oval or angular disk, mostly 
with only four holes, but sometimes also with smaller peripheral ones ; spire of 
the tables made up of two rods anastomosing at the top and terminating in 
small spines. 
Habitat . — Scandinavia from the Sound northwards to Lofoten (Sars, Diiben and Koren, 
Koren, Danielssen and Koren, Danielssen, Mobius), British Islands (Thompson, 
Forbes, Johnston, 0. F. Muller, Norman, MTntosh, Hodge, Herdman, Leslie and 
