however, he instituted a new genus, Notocyathus, to include, 

 amongst several diverse forms, this particular coral. "^ When he 

 referred it to Deltocyathus, he gave it a thick solid columella, 

 but in the definition of Notocyathus he expressly states that 

 there is no columella ! Again, in 1881, Duncan, when reviewing 

 the same species, removed it from Notocyathus to Nototrochus, a 

 new genus specially designed to receive it. In this the columella 

 is restored, but the pali are reduced to paliform lobes, f 



I consider that Woods was right when he placed the coral 

 under Deltocyathus. Both columella and pali are distinctly pre- 

 sent, and, besides, there is the chevron-like arrangement of the 

 septa so characteristic of that genus. Amongst the figures, and 

 accompanying Duncan's descriptions, a good one of the calice is 

 wanting. That given by Woods portrays its main features fairly 

 well. I refer also to the figures and descriptions of the form now 

 to be described, in which the calice, though less elliptical, 

 exhibits a similar arrangement of the septa, pali, and columella. 



Deltocyathus subviola, s/^ec. 7wv. Pi. i. , figs. 3a, b. 



Corallum cone-shaped, with its anterior and posterior sur- 

 faces very slightly compressed aud the base bluntly rounded. 

 The calice rises somewhat above the level of the wall. It is 

 much less elliptical than that of D. viola, in which the ratio of 

 the major and minor diameters is as 100 to 75, while in Z>. sub- 

 viola the ratio is as 100 to 91. 



Septa in six systems with four cycles. The first three orders 

 are very exsert, the primaries rather more than the secondaries, 

 and these again than the tertiaries. In length and thickness 

 there is also a gradual diminution for the same three orders. 

 The 24 septa of higher order than the tertiaries are small, and 

 constitute the fourth cycle, there being, according to my reading 

 of the calice, no fifth order. The total number of septa is thus 

 48, all of which have rounded upper margins, and radiate rows of 

 granules on their sides. 



There are two kinds of pali, viz., six short depressed ones 

 before the primaries, and twelve others, which are both longer 

 and higher, before the tertiaries. Each pair of the latter curve 

 inwards and almost meet in front of the enclosed secondary 

 septumx Lower down they are fused with this close to the 

 columella. Superiorly, a deep groove or notch separates the pali 

 and septa, but inferiorly they are connected. 



The columella is solid and moderately long. Three prominent 

 and equidistant papilli on its surface are in a line with the pali 

 of the lateral primaries. 



* Corals and Bryozoa of New Zealand. Col. Mus., 1880. 



t Revision Madreporaria. Proc. Linn. Soc, Zoo)., vol. XVIII., p. 17. 



