328 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



fastened to it so that the visceral chambers are traversed by bars 

 or barriers, often of considerable extent and height, but never 

 completely closed by them. These organs are called Synapticulce. 

 They are generally accompanied in most of the family by vertical 

 or slightly oblique ridges of compact sclerenchymatous tissue on 

 the faces of the septa from which the synapticulse arise. This 

 tissue is sometimes continuous and equal, but sometimes it is 

 interrupted at regular intervals. The Fungidce are divided into 

 two subfamilies : 1, Fungince, with the wall or common plateau 

 porous and generally roughly tubercular or subspinous ; 2, Loph- 

 osorince, with the wall neither perforate nor tubercular. 



In the first division of this family we have none of the genera 

 in extratropical Australia. Polypliyllia pelvis, is said by Messrs. 

 Quoy and Gaimard to occur in New Zealand, which is very 

 singular as we have no Fungidce in similar latitudes on the 

 Australian coasts. The genera Fungia and Polypliyllia are both 

 very well represented in N.E. tropical Australia, and I believe 

 most of the Pacific species are found in the Barrier Reefs. 



In the second division we have two species, but only found 

 within a very few degrees of the tropics and scarcely straying 

 outside them ; they are both in the genus Cycloseris. 



Genus Cycloseris. M. Ed. 8f H., 1849. 



Corallum discoid, simple, without a trace of adherence ; wall 

 horizontal with finely granular numerous costae and no epitheca ; 

 septa very numerous, (5 to 8 cycles) the smaller united to the 

 larger by the thin inner edge and the superior edge of all finely 

 serrated. 



Cycloseris cyclolites. Lamarck. 



Corallum an ellipsoid, thick, and rising in the centre to a height 

 of about half the major axis, concave beneath, where it is granular 

 in the centre ; costee numerous, close, fine, in cycles, the higher 

 orders smaller and arising near the edge when they are prolonged 

 and lamellar ; central fossa narrow, deep, generally extended in 

 the direction of the major axis ; seven to eight cycles the last not 

 present in all the systems ; septa elevated, the three first orders 



