OF NEW SOUTH WALES. 309 



Genus Ceratotrochus, M. Edit), 8r II., 1848. 



Corallum simple, subpedicellate, in the adult state columella 

 highly developed and fascicular ; septa broad and exsert ; wall 

 bare, with costre distinct to the base, the principal of which are 

 variously ornamented. 



Ceratotrochus penestratus. 



Is a species described by me in the Boy. Soc. Proc, N. S. W., 

 loc. cit., but which now I have considerable doubts whether it 

 should not be regarded as a Dasmia. I shall return to the 

 subject shortly in a future paper on our fossil corals. 



New Genus Crispatotrochus. 



Corallum broadly adherent ; septa small ; fossa broad and 

 deep ; columella highly developed, crispate ; costae simple, dis- 

 tinct, granular. 



Differs from Ceratotrochus in being broadly adherent with very 

 simple costse, broad and deep fossa and small septa. 



Crispatotrochus inornatus, n. s. PI. 6, Fig. 2, a, b, c. 



Corallum turbinate, constricted above the base, which is two- 

 thirds the width of calice ; transverse section subcircular, com- 

 pressed laterally ; costee corresponding to septa, broad, flat, sepa- 

 rated by a finely depressed line, but becoming more distinct and 

 separate at the edge of calice with many not very prominent 

 granules ; calice broadly elliptical ; axis as 10 to 8 ; septa in six 

 systems, four cycles, little salient, thick externally, granular and 

 slightly flexuous internally, those of the 3rd order especially ; 

 primaries and secondaries equal, scarcely larger than the tertia- 

 ries, while the fourth and fifth orders differ a little in size ; all 

 the orders somewhat exsert, but the 1st and 2nd especially; fossa 

 wide and deep ; columella very large, crispate, of spongy, twisted 

 tissue, or broad rounded lobes more like the centre of a cauli- 

 flower. Alt. 12, maj. axis 10, min. 8, diam. of constriction 5, of 

 base 7, mil. 



One specimen only in the Macleayan Museum, dredged at 80 

 fathoms, off Port Stephens. 



