26 
-rth 
i Q th and 22 nd branches on the left. The 5 th and 17 th are only slightly branched and 
not much longer than the unbranched ones; the other pinnules-bearing branches are much 
longer, from 1.5 — 4.5 cm., and greater in diameter. The angle between branches and stem is 
always 6o°; all branches are curved slightly distally and backwards, especially in the top-part 
of the colony. The length of the pinnulae is at the utmost 9 mm. by the lower branches and 
the distal pinnulae decrease in length. On the higher branches the proximal pinnulae are 
it 1 cm., and the more distal ones increase at first to 1.5 cm., but decrease towards the top of the 
branches ; this increasing and decreasing does not take place regularly. All pinnulae are distally 
curved and very seldom they are straight. Besides the two described longitudinal rows there 
are two more rows, one on the front and one at the back of the colony, both in the same 
plane, which makes an angle of somewhat less than 45 0 with the plane of the other rows ; 
in the distal part of the colony this angle slightly increases. The branches of the front row 
are simple with one exception which only bears two pinnulae. The number of branches is the 
same as in the first two rows, and all of them are placed almost at the same level as the left 
row. Their length increases distally from 6.5 till nearly 20 mm., but every time shorter branches 
occur between the longer ones. By the base of two branches another is inserted on the stem, 
at right angles to the principal rows, and some other branches occur at an angle of 30° with 
the right row. The row at the back of the colony is in every respect like the front row, but 
is inserted nearly at the same level as the right row; all branches of both rows are distally curved. 
The pinnulae on the principal rows are also placed in four rows, every time two in the 
same plane; this planes are at an angle of 45 0 . The distance between two pinnulae is 
± 2.5 mm.; they are at an angle of 6o° with the branch and are distally curved. The two 
rows of pinnulae, which are at an acute angle, are on the same level; the two rows which 
are at an obtuse angle shift just like the branches on the stem. Some pinnulae of neighbouring 
branches cohere, but positively it is no concrescence of the 
axis. The diameter of the stem is 0.85 mm. at the base and 
gradually decreases to the top, which ends 3 mm. above the 
last branch; the diameter of branches and pinnulae is in pro¬ 
portion to their length. 
The spines are arranged in four longitudinal rows on 
the pinnulae and branches, but on the stem there are at least 
6 rows visible from one aspect. The rows are nearly at the 
same height so that the spines form verticils, but there are 
also places where a slanting quincunx appears. The distance 
of the. spines in a row is 180 p. ; the length of the spines on 
the polyp-bearing aspect of the axis is 30—40 p., and they are 
somewhat shorter at the other side. The spines are triangular, 
with a smooth surface (fig. 1 a) and a sharp apex. 
Nearly on the whole colony the polyps, which are well 
preserved, are placed on the front aspect of the stem and the 
the upperside of branches and pinnulae. The tentacles are arranged in three pairs (fig. 1 b , r, d) y 
a branch, at the polyp-bearing side ; b y r, d 
polyps; a 52 X ; b and c 14 X ; d 7.6 X- 
