230 



the strongly arched basal surface is divided into dendritically branched longi- 

 tudinal belts. 



The lateral chambers. The scapular as well as the infra-scapular chamber 

 is turned slightly frontally. It is in most cases developed as an avicularium of 

 very variable size, which may attain a considerable, sometimes enormous size 

 especially in the branches consisting of single zocecia only. The infra-scapular 

 chamber, which has generally a long oval opening, terminates in a projecting, 

 conical, membranous portion, which forms an angle with the avicularium. The 

 pedal chamber, which in the zooecia with a large avicularium almost reaches 

 right up to the infra-scapular chamber, is usually separated from the latter by 

 a rather short intermediate space. It is provided with a wholly frontal and at 

 least in the single zooecia longitudinally oval or pear-shaped opening. The infra- 

 scapular, adzooecial chamber of the mother-zooecium is wanting in the bizooecial 

 segment. 



The oceciutn. The gonozooecium, which is of about the same length as the 

 covering kenozooecium, takes its origin either directly from a mother-zooecium or 

 from an inserted single zooecium. The aperture is provided with a broad, more 

 or less regular, sometimes extremely indistinct sinus, in which the narrow distal 

 ends of the two outermost of the 3-5 fenestrse of the sternal area often termin- 

 ate. No spines. On either side 1 — 2 small, oval chambers, the distal of which is 

 often very small or absent, sometimes on one sometimes on both sides. 



The covering kenozooecium has on either side a large, long, frontally pointed, 

 basally broadly rounded, uncalcified portion, through which the ooecium can be 

 seen. The latter is here provided with a longitudinally club-shaped, very dense 

 collection of poi-es, the intermediate spaces of which partly project as tubercles. 

 In the frontal portion between the two areas as well as along the distal and 

 proximal margins of the latter the ooecium and the covering kenozooecium are 

 connected with each other by a great many robust spinous processes, and the 

 kenozooecium has in the centre of its frontal surface a chamber developed to a 

 varying extent, which is sometimes mostly membranous and sometimes developed 

 as a rather high avicularium. In the latter case it is connected on either side 

 with a partially membranous chamber, of which the one side joining the oper- 

 cular end of the avicularium is somewhat higher than the other. In spite of the 

 median position of these chambers they may be regarded as corresponding to 

 the three lateral chambers on one side in an ordinary zooecium. 



Form of colony. In the principal axis and the principal branches springing 

 from it two bizooecial segments succeed each other with a single zooecium be- 

 tween (2, 2, 1, 2, 2, 1 ), 



