232 



the daughter-zocecium. This inconiplcleness mosi often means the ahsence of the 

 mandible and transverse bar in the apertnre, and as a rule also a more or less 

 incomplete calcifieation of the wall sejiaraling the scapular from the infra-scapular 

 chamber. The infra-scapular and the jiedal chambers, whose boundary ridges 

 towards the frontal surface of the zooccium give the latter a rhombic form, are 

 separated by a ridge running obliquely basally and ])roximally. These chanibcrs 

 take up not only the lateral surfaces but also the greater pail of llic basal sur- 

 face, along the midiile of which they are separated by a rathei' narrow longi- 

 tudinal bell (IM. XI, ligs. 4 a, 4 ])). The infra-scapular chandler communicates 

 with the zoo'cium by uj) to l(t rosette-plates and with the avicularium by only 

 1 — 2. The molher-zoa'cium is provided with a long, narrow, adzotrcial, infra- 

 scapular chamber. 



The ooecium. The gonozoa'cium, which is considerably smaller than the 

 covering kenozoax'ium, is situated sometimes on a molher-zo(rcium, sometimes 

 on an inserted single zoo'cium. The aperture has a very broad and deep sinus, 

 consisting of a wider outer part, which is bounded bj' two arch-shaped, in- 

 wardly converging margins, and of a narrower inner part, which has a small, 

 rounded process on either side. The sternal area is provided with 7 — 9 very 

 narrow fenestra; and with a broad cryptocyst lamina, while each lateral surface 

 is occupied bj' two large lateral chambers separated by an angulated ridge. The 

 covering kenozooecium distally to the aperture on either side has a very irregular, 

 transversely oval or bean-shaped, often more or less sharply sinuated or lobed 

 uncalcified portion with a cryptocyst dei)ression in its marginal portion. On its 

 surface we find (j — 10 chambers of most variable form, which are covered by a 

 membranous roof and bounded only by low ridges. Distally to and outside the two 

 uncalcified areas there is on both sides either one very long and rounded or two 

 adjacent chambers, a larger and a smaller one. On the basal side of the o(i!cium 

 we find three, a smaller unpaired one proximally and two adjacent ones distally, 

 the proximal half of which may somelinies l)e provided with a sepaialiug ridge. 

 On the frontal side of this group we find again a sejiarale one ending in a very 

 thin point (figs. 1 b, 1 e), while its basal part lias two bulgings which may be 

 separated as indejicndent chambers. 



Form of colony. We may find rows of up to f) single zotrcia s|)ringing from 

 a daughter-zoo'cium, but otherwise the alternation of uni- and bi-zocecial inter- 

 nodes is regular. 



Of this species I have examined a colony from Port Philli]) Heads (Miss 

 Jelly). 



