312 



cular areas is provided as a rule with three rods directed towards the apex of 

 the avicularium, of which the middlemost is the longest. Some few pores are 

 seen on the surface of the avicularium. The basal avicularia which as growth 

 proceeds are inclosed in the interior of the colony have a very small, sometimes 

 almost circular, sometimes short egg-shaped frontal area the cross-bar of whigh is 

 provided with a single rod. The mandible is almost semicircular. The avicularian 

 chambers, the length of which is not very different from the height of the zooecia, 

 are elongated vertically and the single chambers are in inner connection by means 

 of a few sihgle-pored rosette-plates. Each free wall is furnished with 5 — 8 pores 

 surrounding the avicularian area. 



The lunoecia occur in very small number and for each zooecial row there is 

 scarcely a single lunoecium. They may occur both in the zooecial and in the 

 avicularian rows, and there are usually proximally to each of them two, as a 

 rule very small avicularia, the mandible of which is directed obliquely proximally 

 (towards the broad end of the colony) and outwards. More rarely there is only a 

 single one which has the mandible directed proximally. 



The colonies are top-shaped and both the zooecia and the avicularia are ar- 

 ranged in radiating, more or less regular rows. Further, there is an arrangement 

 into one or partly two systems of oblique rows rising obliquely towards the tip, 

 and the single rows are here accentuated by step-like depressions. 



Colonies from Port Jackson and Port Stephens, Australia. 



To the genus Flabellipora belong several species in the Copenhagen Zoological 

 Museum and one of them is probably identical with d'Orbigny's Fl. elegans, but 

 not with Waters' species of the same name. A colony from Port Jackson, which 

 has quite the same fan-shaped appearance as Waters' species, probably belongs 

 to this, for which I would propose the specific name flabellaris. Like the species 

 of the genus Conescharellina it is provided with lunoecia, but the zooecia are as 

 in Flabellipora arranged in two layers. For this form the vacant generic name 

 Bipora might be employed, but this can only be retained with the reservation, 

 that the main difference between Conescharellina and Bipora, as this genus is 

 understood here, appears to be constant; it is just the presence in the former 

 genus of the above-mentioned, enclosed, small avicularia. The following statement 

 of Waters^ would indicate however that such avicularia may occur in the spe- 

 cies mentioned; » others have between the layers a cancellous structure with num- 

 erous large openings, between which are small round avicularia*. In this case 



'■ 107, p. 200. 



