158 PROF. p. M, BUNOAJT ON THE 



or tliey may be high and continuous, and coincide with the septal 

 tissue by curving here and there, and even giving forth outshoots. 

 In a few places the synapticula are oval in section when seen at 

 the side, small, yet much larger than any granules, and nipped-in 

 midway when seen from above. 



The minor calicos surround the smaller one in several concen- 

 tric rows ; and the last series has long septo-costse which reach 

 to the thin edge of the corallum. Most of the calices are di- 

 stinctly separate in their fossulse from their fellows of the same 

 circle ; but some, whilst free, are only divided from one or both 

 of their neighbours by a single large septum. In a very few in- 

 stances the large septum does not stretch across, and is divided 

 midway, so that the fossulse of the calices communicate at the 

 side. These concentric calices are shallow and small, and have 

 six, eight, twelve, or more septa, which resemble those of the 

 large one in their method of junction and of increase of numbers. 

 It is evident that these calices are in organic connexion with the 

 large central one, for its larger septo-costse are continued into 

 some of the smaller calices which are in their radial path. 

 Moreover this is also the case with the higher orders of septa. 



The outermost calices have their septa continued to the margin 

 as alternately large and small and long septo-costse ; and the synap- 

 ticula joining them are short, curved, and often knob-like. 



There is no wall to any calice as there is in the compound corals 

 of the AstrseidsB, which separates one from the other, and the only 

 wall is basal and synapticular. 



The corallum, as a whole, is thin and consists of a more or 

 less circular lamina fixed below, bulged out correspondingly 

 above, and sloping down all around, and then turned up at the 

 edge. 



The under surface is marked indistinctly by radiating costse, 

 which are most distinct near the edge, where their relation to the 

 septa can be seen. Between the costse are small, round, and 

 larger slit-like openings rather irregularly placed ; and the costse 

 themselves are shortly granular. As in the genus Fungia, the 

 basal openings are produced by defective synapticula. 



The columellse of the smaller calices are flat, and are made up 

 of the ends of septa and are deeply seated. 



The upper part of the interseptal loculi is open, and the lower 

 portion is made up of a number of very irregular canals which 

 communicate with each other and with the outside by means of 



