312 



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

 tlie aviculariuni, of which the middlemost is Ihc longest. Some few j)ores are 

 seen on the surface of the aviculariuni. The hasal 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 which is 

 jirovided 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 zotccia, 

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

 of a few single-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 zod'cial row (here is 

 scarcely a single luncecium. They may occur both in the zoo'cial and in the 

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

 rule very small avicularia, the mandible of which is diiectod oblicjuely proxinially 

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

 single one which has the mandible directed proxinially. 



The colonies are top-sliaped and both the zocrcia 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 obli(|ue rows rising obli(juely towards the tip, 

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



Colonies from Port Jackson and Port Stephens, Australia. 



To the genus Flahellipora lielong several species in the (>openliageii Zoological 

 Museum and one of them is [)robably identical with d'Orbigny's Fl. elccjans, 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 ftabellaris. Like the species 

 of the genus ConescbaveUimt it is provided with luncccia, but the zooecia are as 

 in Flahellipora arranged in two layers. For this form the \acanl generic name 

 Blpova might be employed, but this can only be retained willi the reservation, 

 that the main dilTerence 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 al)ove-mentioned, enclosed, small avicularia. The following statement 

 of Waters' would indicate however thai 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. 



