20 THE PEOCEEDINGS OF TSE LINNEAN SOCIETY 



cycles, and are common on the coral rocks, and in sandy places 

 at from 10 to 20 fathoms. So little is known of the young stages 

 of any of these corals that I think it worth the notice of 

 naturalists to describe a young 0. sinensis. 



Corallum very small, quite circular, somewhat raised or 

 thick, base not quite flat but sloping very slightly to a circular 

 Qattened disk, about half the diameter of the whole ; costae very 

 distinct, prominent, in cycles corresponding to the septa, and 

 agreeing in point of size, all very granular, and becoming a mere 

 set of detached granules in the central disk ; septa rather thick, 

 projecting beyond the margin, increasing in height to the edge 

 of the fossa, all closely and very prominently granular, and the 

 edges dentate in six systems otfive cyles ; primaries free to the 

 fossa, and much thicker than the others ; tertiaries united to the 

 secondaries at the fossa ; fourth and fifth order uniting with the 

 tertiaries about half way ; all the orders of the fifth cycle present, 

 but the two last much smaller, and all much serrated at the edge ; 

 fossa small, columella represented by a few papillae. Diam. 6, 

 alt. 2 mil. Princess Charlotte's Bay, 10 to 20 fathoms Chevert 

 Expedition. 



The flattened disk at the base of the corallum would seem 

 almost like a point of attachment. If the young stage of 

 0. sinensis is pedicellate, it hardly leaves any traces of its 

 existence in the adult state. The specimens under notice were 

 found free, so that the fixed state must belong to a still earlier 

 stage. 



Gycloseris sinensis is said by Messrs. Ed. and H. to be a native 

 of the Chinese seas, and there is no mention made of any central 

 disk, which however is found on the lower part of every Australian 

 specimen. I have not been able to compare with any type 

 specimen, so that our Australian examples may after all be a 

 difierent species. But the similarity is so close in every other 

 respect that I can hardly think this is the case. 



EXHIBITS. 



The Rev. J. E. Tenison- Woods, F.L.S,, etc., exhibited seeds of 

 various kinds of Eucalyptus, and directed attention to the fact 



