KUNGL. SV. VET. T AKADEMIENS HANDLINGAR. *BAND 59. N:0 |. 13 



have been described as new species, actually are not definite species. Such a revision 

 will also show whether there exists any real difference between the genera Paracyathus 

 and Trochocyathus. 



The bases encrusting. Epitheca seems to be lacking. Costae, corresponding 

 in nnmber to the septa, distinct everywhere, where polyzoa &c. do not cover the cor- 

 allum; they are almost equal in size, low, not very broad, and possess crowded, mi- 

 nute granules. 



In nos. 1 and 2 the septa of the first two cycles are equal; they are more exsert and 

 project rather further into the calice than those of the other cycles. The septa of the 

 thircl cycle are not so large and those of the fourth, which are still smaller, fuse with 

 them near the columella. The third specimen is worn and many details are obliter- 

 ated, but the mutual proportions between the septa of different cycles seem to be ana- 

 logous. A few, very small septa of the fifth cycle, which are developed, do not show 

 any tendency to fuse with the others. 



All septa are exsert and closely granulated. Each septum in nos. 1 and 2 has a 

 permanent dark-coloured, vertical streak at its upper part; thus the corallum, viewed 

 from above, shows a dark, marked ring, closely surrounded by a light one, formed by 

 the white parts of the septa. On the same specimens such a dark ring exists also on 

 the outside of the corallum, directly below the place where septa pass into costae. The 

 colour of the worn specimen, no. 3, has faded. The upper parts of the septa entire, or 

 very finely denticulate; towards the columella the teeth of the septa become more 

 obvious. 



Owing to the site of the columella on a lower plane than the pali, and to the almost 

 vertical steepness of the septal edges and of the pali, the latter are conspicuous in speci- 

 mens 1 and 2. Only about half the number of septa possess pali. Each septum has 

 only one large, marked tootli, but inside of it. near the columella, there exist some 

 smaller Jobes too; in most cases, however, these lobes do not make the impression of 

 being independent formations, but only parts of the large pali-tooth. Viewed straight 

 from above there appears only one crown of pali, formed by the marked teeth. In 

 no. 3, which has a more open calice and not so steep an inner edge of the septa and 

 the pali, the partition of each septal edge into several pali-teeth is more obvious, and 

 hence the pali pass into the columella more continuously, even when viewed from 

 above, than is the case with nos. 1 and 2. 



The columella is well develojied in all the three specimens, but not very dense; 

 the snrface is papillous. 



Paracyathus profundus Duncan 1886. (Figs. 18—19). 



Paracyathus profundus Duncan 1886 (G), p. 4, plate 1, tigs. 4 — 6. 

 45 railes W.S.W. off Cape Jaubert, 15.7.11, 78 feet, 1 sp. 



Height of the corallum, including the broad, encrusting base, 8,5 mm. Calice 

 slightly elliptical, open, and rather deep; length of calice 6,4 mm, breadth 5,9 mm, 

 depth 2 mm; the marginal axes in the same plane. Septa 46; the primaries are a little 

 more exsert than the others and project a little more into the calice; the secondaries are 



