OF NEW SOUTH WALES. 305 



This species occurs living between Port Jackson and Port 

 Stephen's of double the size mentioned here. The costae are in 

 cycles corresponding to the septa. It is very rare. 



There are slight differences between Prof. Duncan's description 

 and the living form. The ornamentation of the costae is sub- 

 spinous, and the columella is a linear series of very granular 

 papillae which send off processes to the septa. The pali are in 

 reality only deep lobes of the septa. This is a case where, 

 according to Prof. Duncan these processes should not be regarded 

 as pali at all, yet I have very little doubt that these single lobes 

 perform the offices of these organs and that there is an extra 

 crown of tentacles on the animal. Some of the primary septa 

 send forth transverse spinous processes at the origin of the pali. 



New Genus Dunocyathus. 



Corallum simple, parasitic ; base and side entirely immersed 

 in calcareous foreign body ; one row of pali. 



This genus is erected for the reception of immersed and 

 parasitic corals of the Caryophyllian group of simple Turbinolidae ; 

 consequently it possess pali, but as it is immersed nothing can be 

 said about the costae, base, &c. The name was taken from &i, V ui, 

 immersed or sunk. Only one species has as yet been found, but 

 the necessity of a separate genus for its reception is quite obvious, 

 The appearance of the entire pali and columella would place it 

 close to Paracyathus. 



DtJNOCYATHUS parasiticus, n. s., PL 5, Fig. 4, a & b. 



Corallum entirely immersed in the base of Lunulites cancellata, 

 Busk, the wall being slightly curved outwards. Calice circular 

 and shallow ; septa in six systems of three cycles ; primaries and 

 secondaries of equal size, very slightly salient but sloping away 

 from the sides ; the edges denticulate or set with irregular lobes 

 and points, and both surfaces set with very coarse projecting 

 granules. Columella with a papillary summit united below to the 

 pali which are indistinct, confluent and sending forth horizontal 

 traverses to the septa so as to form irregular horizontal laminae 

 from which the columella rises. Diam. 2 millim. Off Port Jack- 

 son, 45 fathoms. J. Brazier. 



