BY REV. J. E. TENISOX-WOODS, F.L.S. 297 



with porous channels between them. In the Feejean specimens 

 the calice was regular and the exterior surface coarsely granular 

 without any linear disposition like costee. 



At Moreton Bay they dredged at a few fathoms what Dr. 

 Macdonald regarded as another species. The two specimens 

 taken had well-marked costce, which corresponded exactly with 

 the four cycles of septa. 



I have very little doubt from the description and from the 

 figures, copies of which are here given, that the specimens were 

 (some of them) specifically identical with the Zobopsammia referred 

 to in this paper. The specimens from Moreton Bay are more 

 like the species of Psammoseris described by me* as P. cylieioides. 

 I will now give the observations of the author. 



" The most remarkable circumstance connected with these 

 polyps, is the invariable presence of a little solitary Sipunculus 

 in a beautifully excavated burrow at the base of the corallum. 

 The uniform position of the opening and sinistral direction of 

 this burrow first observed in dead specimens led me to suppose 

 that it was in some way connected with the economy of the polyps 

 themselves, but having discovered its occupant to be one of the 

 coral perforating Sipuneulidce, which abound in the South Seas, 

 the riddle was quickly solved. The body of one of these parasites 

 taken from a Bellona Reef specimen, is about three-quarters of 

 an inch in length, terete but gradually increasing in diameter 

 from before backwards, and exhibiting a permanent curvature 

 forwards corresponding with that of the burrow." 



On examining a large number of the corals of Lobopsammia, I 

 find that Messrs. M. Edwards and Dr. Gray were both in error 

 in supposing that the coral invested a shell. In the first place it 

 would strike any one as a remarkable fact that the aperture is 

 nearly always sinistral,! while the irregular shape would lead 



* Proc. Linnean Soc , N.S.W., Vol III., (1878) p. 8. 

 f Out of 50 specimens, all were sinistral but one. 



