159 



Dunocyathus parasiticus, Tenison Woods, Proc. Linn. 

 Soc. N.S.W., vol. II., p. ;50r), pi. v., H<<. 4. 



The description of the species by Woods is in the main 

 correct, but needs the following additions. The specimens are 

 attached to a polyzoon, which is always of the same species, 

 viz., Btpora canccllata , Busk. A few individuals are immers- 

 ed, but the great majority rise above the polyzoon, and show 

 broad prominent costae on the wall. These do not correspond 

 with the septa, but occupy the alternate spaces between them. 

 The third cycle of septa consists of very short, thin lamellae. 



A large number of examples were dredged by Dr. Verco, 

 35 miles S.W. of Neptune Island, at 104 fathoms, and olf 

 Cape Jaffa, at 90 fathoms. The species was also found, but not 

 so plentifully, at 130 fathoms of! Cape Jaffa, and from 110 to 

 200 fathoms off Beachport. A single example was sent to me 

 by Mr. Hedley, who dredged it at 250 fathoms off Port Jack- 

 son. Woods's type, it will be remembered, came from that 

 locality, but at a depth of only 45 fathoms. 



Genus Ceratotkochus, Milne-Edwards and Haime. 



Ceratotrochus recidivus, spec nov. Plate vi., figs. \a, b ; 



2ft, //, c. 

 Numerous examples of this coral were dredged by Dr. 

 Verco, and all exhibit a remarkable peculiarity, viz., that each 

 is invariably attached to the interior surface of a fragment of 

 a similar corallite. xV typical and fairly tall corallum is at- 

 tached to an earlier fragmentary one in a manner which in- 

 dicates budding from a parent calice. A few short septal 

 laminse are still visible where the base of the new corallite 

 fuses with the margin of the old wall (pi. vi., fig. 2a). 

 Another example in the collection has its wall split longitudin- 

 ally into four nearly equal portions : these are still loosely held 

 together, and enclose an elliptical calice, which at its margin 

 shows a very thin inner wall separate from the outer one 

 (pi. vi., fig. 26). A third specimen is further advanced, the 

 old wall being now represented by semi-detached fragments 

 only, above which a voung corallum rises. The calice, which 

 is also elliptical, is well developed, and has its full complement 

 of septa. Many detached wall fragments, showing the re- 

 mains of septa on their internal surfaces, are also minorled 

 with the dredged material sent to me. 



I think it is evident from the specimens that growth from 

 a parent calice, due to internal budding, has taken place. 

 Usuallv this appears to be single, but examples occur where 

 two coralla are fixed to the same fragment. Sometimes these 

 are independent of each other, or they may be partly joined 



