﻿166 MADREPORAEIA. 



sloping calicles, or their protuberant walls ; the lower ends of the nariform ridges may break 

 up into tubercles. Small ii-regular upgrowths from the encrusting portion of the stock are 

 covered with short, slightly wavy ridges of even thickness and with rounded tops. These, 

 running in different directions, give the prominences a jagged appearance. 



There is only a single small specimen of tliis coral, which I have been unable to associate 

 with any of the foregoing. The method of growth of the specimen might be that of a young 

 foliosa, the encrusting portion throwing out free upwardly curved lobes. For this reason I at 

 first included it among the specimens oi foliosa. On the other hand, there is no evidence that 

 this stock would have formed a foliate stock, and further, the nariform ridges are quite different 

 from the ridges in ilf. foliosa. Then, again, the calicles developing on the turned-up under- 

 surface of the thick rounded edges (which suggested the specific name) is very unlike what is 

 found in M. foliosa, where the edges are very thin, and though calicles are very numerous on 

 the under surface, they rarely appear within a cm. or two of the edge. Lastly, the peculiar 

 ridges on the small prominences remind one most of those of M. vindis (see p. 99, PL XXXIII. 

 fig. 10), and the whole coral has the same peculiar glassy appearance, only the colour is red- 

 brown, almost a red peach-colour round the edges on the under side. 



The specimen is further interesting because a portion wliich has been folded down under 

 the rest has the whole surface texture with the margins of the calicles so remarkably developed 

 that one would fancy that there could be no specific connection between that portion and the 

 more normally grovring remainder of the colony. 



a. Palm Island, Great Barrier Eeef. Coll. Saville-Kent. (Type.) 



