OF NEW SOUTH WALES. 329 



thicker internally and often united to the smaller for a great part 

 of their surface, granular in radiate lines ; very numerous and 

 giving the edges of the septa quite a mossy aspect ; columella 

 and papillos at the bottom of the fossa ; synapticula3 numerous 

 but not easily seen as the septa are so close. Long. 50, lat. 85, 

 alt. 25 millim. 



Lady Eliot's Island, Harvey's Bay, (lat. between 27 and 26), 

 and so up to the Barrier Reef, though rare. Common in New 

 Caledonia. 



Cycloseris sinensis. M. Ed. fy E. 



Corallum nearly circular, very thin, slightly exsert, and a little 

 concave beneath ; costee in cycles but very uniform in size, close, 

 very small, the higher orders and a small part of the centre being 

 only a series of granules ; fossa open, more or less extended in a 

 line of the slightly longer major axis ; columella conspicuous ; a 

 crowded mass of long almost circular papillae ; septa in eight 

 cycles not always complete in some of the systems, the higher 

 orders of the last being wanting or rudimentary ; all very thin, 

 very granular, the primaries and secondaries being just a shade 

 thicker and more raised at the fossa ; edges not serrated but 

 irregular ; synapticulee irregular, not numerous, solid ; granules 

 subspinous and giving the laminee a mossy appearance as seen 

 from above ; the septa of the higher orders are often fenestrated 

 and often unite by their inner edge to the older. At their base, the 

 synapticulae appear as solid ridges. Diam. from 20 to 30, alt. 

 5 to 8 mill. Scarcely 2 millimetres difference between the major 

 and minor axis. Localities same as preceding. Very common 

 at Darnley Island. Rare outside the tropics. 



Cycloseris tenuis. Duncan. 



Corallum circular and very thin, slightly convex in the centre ; 

 fossa shallow, elongate ; concave below with numerous costag ; 

 septa distinct, distant, slightly dentate, in six systems of five 

 cycles. Diam. 12, alt. 6 mil. River Gellibrand, Victoria. Fossil 

 only. Prof. Duncan's definition is somewhat brief. The five 

 cycles, however, sufficiently distinguish the species. 



