121. 



Ali'popnra viridis tho uppor margins of tlio walls of tho calieles 

 are relatively smooth and the rudimentary septal spines are slender 

 and very deeply set. In A. spongiosa, on tlie contrary, the corres- 

 ponding spines are short and thick and conspicuously developed 

 near the calicinal orifice. Collected by the author in the neigh- 

 bourhood of Thursday Island, Torres Straits. 



TRTDAroPHVLLIA HKCTIFOLl A, Sji. nor. 



Corallum. exceedingly fiagile, forming a subeven hemisphere ; 

 calicinal centres confined to the bottoms of the valleys, tho 

 external distal edges of the calieles even and uninteirupted, 

 slightly pei-f orate, not lacinulate ; valleys 5 - G centimetres wide; 

 septa forming 3 or 4 cycles, subeven, their edges very finely 

 denticulate, the distal termini of the first to thiid cycles slightly 

 excui'rent and somewhat echinulate. Diametoi- of entire corallunj 

 44 centimetres ; height 18 centimetres. 



Hah. New Hebrides. 



The great depth of the calicinal \'al]eys, their perpendicular 

 walls and subeven non-iacinulate distal edges, distinguish this 

 species from I'ridacophijJlixi Uict\ica., which in other details it most 

 nearly resembles. The magnificent .specimen constituting the type 

 of this species, and of which a reduced photographic representation 

 is appended, is contained in the Australian Mu.seum, Sydney. 



