MADEEPOEAEIAN STJBPAMILT LOPHOSERIlSr^. 315 



The upper surface of tlie corallum is marked with irregu- 

 larly shaped calices, short series, and slightly projecting inter- 

 mediate ridges. A row of small calices is close to the margin, 

 and the larger ones are nearer the centre. The calices are usually 

 deep, and have a deep fossa around the small, slightly papillose 

 columella ; the septa are close, suhequal, and whilst some are 

 simple, others are composed by the union of many others. The 

 septa of one calice pass over the low flat coUines, and unite with 

 those of other calices, or reach the margin. They are ornamented 

 on their free edge with subequal flat spines, broad and blunt 

 above, placed at regular and close distances ; their tops are 

 minutely spiuulose. Near the wall on which the septa rest and 

 whence they spring their laminae are solid ; higher up they are 

 perforated in a moderate degree, and especially near the columella. 

 On the flanks of the septa are tolerably regularly placed nodules 

 which unite with the adjoining laminae and are syuajDticula in 

 the Lophoserine sense ; that is to say, they are discontinuous, 

 yet more or less in vertical series. They are placed on the solid 

 and grow on the trabecular part of the septa, are in relation to 

 vertical nodular swellings on the septa and trabeculae, and are as 

 stout as the septa in some places. 



The growth of the corallum occurs by gemmation from the long 

 septo-costae at the margin, by gemmation (intracalicular) from 

 within the well-formed calices, and also by fissiparity. 



The short series have usually the calicular centres distinct, but 

 not always ; and the colline bounding the series towards the 

 margin, or separating one series from another, is higher than the 

 almost rudimentary eminences between the serial calices. 



The longest calices are 1 centim. long and 4 millim. deep. 



The nature of the basal wall, the solid structure of the septal 

 laminae in contact with it, the junction of the higher orders 

 of septa with others to form large septa reaching the columella, 

 the synapticula, and the absence of endothecal dissepiments place 

 this form amongst the Lophoserinae. The specimen I have exa- 

 mined does not show any endothecal dissepiments. But as in 

 other Lophoserines the intrusion of parasites has developed 

 extremely delicate endotheca near the morbid spot, but not else- 

 where, this, I believe, is explanatory of the figure of them 

 given by Milne-Edwards and Jules Hairae. 



