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The Antipatharia of the Siboga expedition

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ioi

the relation between this species and Eubathypathes (especially Eub. quadribr.) is very near. Diagn osis:

Colony: Two rows of simple branches, nearly in a plane, and a third double-numbered row of branched branches. For mode of branching cf. figs. 97 and 98.

Spines: On the branches: distally inclined, smooth, acute, with an elongated base, in 4 longitudinal rows; length 225 p and 130 p, mutual distance 600—750 p. On the stem: knob-shaped, at right angles with the axis; max. 80 p; distance 150 p, 3 longitudinal rows, but one half of the axis is smooth; spines often forming longitudinal crests.

Polyps: Un known.

3. Parantipathes tenuispina Silberfeld.

Parantipathes tenuispina Silb. silberfeld, Japanische Antipatharien, p. 20, Taf. i, fig. 4. Stat. 289. 9°o'.3S., i26°24'.5E. Timor-sea. 112 M. Mud, sand and shells. 1 spec.

This specimen, 13 cm. long, is curved and sinuous. The basal plate is not sharply defined and follows the irregularities of the underground. The stem is branched over its entire length, but in the higher part the branching is more dense. On a height of 2 cm. sits a branch of 6 cm. length. The branches have a more blunt top than in Parantipathes columnaris. — The basal diameter of the stem is 0.75 mm., which increases to 1 mm. on a height of 4 cm. Then the diameter remains subequal, to diminish at the top. The large branch is subequal in diameter, viz. 0.75 mm. over its entire length. As to the other branches, they are nearly all of them simple; only a few have secondary branches, small in number and irregularly distributed. The primary branches are directed towards every side, always nearly at right angles with the stem. In their further course they are straight or slightly curved. The average length is 1.5 cm. on the side of the wormtube, and more than 1 cm. on the other side of the stem; so the exteriorside of this tube marks the virtual axis of the colony. The branches are crowded without regularity; they give to the colony a cylindrical shape with a diameter of 2.5 cm. and a blunt apex.

The large branch bears many broken branches at right angles, and ditto secondary branches.

The wormtube only follows the stem over the last 8 cm.; there are several Annelids

assembled in the upper half of the tube, except the last 2.5 cm. ct _^ ^q^,,-^

The diameter of the tube is 4 mm.; its walls are built in the same manner as those of Parantipathes columnaris, with alternately regular and irregular structure. &

The spines (fig. 98 a) on the top of the branches are blunt, "s^ssp^ and become only more acute (fig. 9S b) on a little distance from Parantipatkej tenuispina^.

J a Spines on the top of a branch;

the top. They are irregularly distributed; sometimes 4 longitudinal i Spines on the base of a branch;

a b 52 X*

rows are indicated, but only for a short distance. In such a row

the mutual distance is more than 400 p; otherwise this value is very variable. On the stem the distribution is entirely irregular.