128 THE PROCEEDINGS OF THE LINNEAN SOCIETY 



of the calice was surrounded by perforated depressions which, 

 according to Agassiz, may have been articulations for dorsal rays. 

 There is another species from the chalk of Rugen with the 5 funnel- 

 shaped openings reduced to little pores. 



EXPLANATION OF PLATE 13. 

 Fig. 1. Euhtiminaria ducalis, side view, slightly enlarged. 

 Fig. la. ditto ditto seen from above. 



Fig. lb. Mouth of cell much enlarged. 

 Fig. Ic. Base slightly enlarged. 



On some Corals from Darnley Island. 

 By the Rev. J. E. Tenison- Woods, F.L.S., &c. 

 Plates 9 & 11. 

 Among the many corals brought from Darnley Island by the 

 Hon. W. Macleay, F.L.S., as the result of the Chevert 

 Expedition, there are three which seem to vary sufficiently from 

 any hitherto described to entitle them to specific description. 

 At the same time I do not positively say that they are new 

 species, as I am not sufficiently acquainted with the extent to 

 which these reef-building forms vary in their modes of growth. 

 The hemispherical Symphyllia here described does not appear to 

 have any congener of its peculiar habit and size. The Musses 

 form reefs round Darnley Island with many others, but especially 

 Seriatopora suhulata, Ellis. I propose shortly to give a list of all 

 the North Australian forms, and in the meantime these species 

 may be noted. 



Symphyllia hemispherica, n. s. Plate 9, figs. 1, 2, 3, 4. 



Corallum largely hemispherical ; calices seldom simple, some- 

 times as many as eight in one valley ; irregularly concave, 

 shallow (from 4 to 6 millimetres in depth), with apparently six 

 systems and four cycles, or occasionally five, but they are 

 unequal and irregular, and very difficult to make out. Septa 

 equal, the higher orders often uniting a short distance from the 



