145 



one another. The zooecia here show no uniformity in position. Part of one lobe is formed of two 

 successive pairs of connate zooecia, which have the relations of those of typical Reptotubigera. 

 Most of the zooecia of the adnate part are, however, alternate; a meclian zooecium having one 

 other on each side of it, but at a different level in the length of the lobe. Towards the end 

 of one of the adnate lobes, the zooecia are assumingf the serial arrangement seen in the erect 

 sterns. The margins of the lobes may give off kenozooecia, of about the same diameter as the 

 complete zooecia, which fix the lobe firmly to the shell. Where an erect stem is developed, 

 some of these kenozooecia 1 ) pass longitudinally up the basal surface of the stem, which, however, 

 grows more rapidly than the bundie of basal kenozooecia. The branches thus have a flattened 

 basal surface near their distal ends, but more proximally the kenozooecia grow up the back 

 of the branch, so as to give this surface a convex shape. The pores are very numerous on 

 all parts, including the free peristomes. The zooecia of the erect sterns are similar to those of 

 the Oueensland specimen represented in fig. i ; but many of them have free peristomes, some 

 of moderate length. 



The specimen represented in figs 1,2 is from a Oueensland slide which formerly 

 belonged to Miss Jelly. It is one of four fragments which consist of erect sterns, of a nearly 

 cylindrical shape; and there can be no reasonable doubt that they belong to the same species 

 as the 'Siboga' specimen above described. The branches bifurcate several times, sometimes 

 at an acute angle, sometimes at an angle of nearly 90 . The basal surface is convex and is 

 marked by distinct longitudinal septal lines, which project as slight ridges, between which the 

 surface of the zooecia is very gently concave. From the evidence afforded by 285. A. it may 

 be assumed that this appearance is du e to the kenozooecia which have grown up the back of 

 the branches from the proximal end of the colony. On the frontal surface the zooecia are 

 arranged in series, usually with no break in the middle line. In the second series from the 

 distal end seen, towards the upper end of the figure, in the left hand branch, the transverse 

 row of zooecia extends in a spiral way across the whole uïclth of the branch, and is completed 

 by the zooecium projecting to the right ; this zooecium being separated by an interval from 

 its nearest neighbour. In the series next on its proximal side an interruption in continuity 

 occurs nearer the middle line of the branch, and in such a position that two of its zooecia 

 appear to belong to the left side and four to the right side. There is in fact a good deal 

 of irregularity in the disposition of the series, which have a tendency, however, to extend 

 across the whole width of the branch, in such a way as to form a curve which is convex 

 towards the proximal end. At the outer ends of the series, two or more of the zooecia are 

 commonly connate distally, the peristomes not showing much tendency in this specimen to 

 become free. 



Three of the fragments on this slide possess ovicells, of the type represented in figs 1, 2. 

 The greater part of the ovicell belongs to the basal surface of the branch (fig. 2), where it 

 occupies the length of about four zooecial series. At its proximal end the ovicell is no wider 

 than a zooecium; but it then expands in a pear-shaped way, until it reaches its broadest part, 



1) The "canaux de renforcement" of Pergens (1S90). 

 S1BOGA-EXPEDITIE XXVIII (7. 19 



