OP NEW SOUTH WALES. 301 



Genus Conocyathus, D'Orbigny, 1849. 



Coral simple, trochoid, straight, without trace of adherence ; 

 costsa sublamellar ; septa exsert and laterally granular ; no colu- 

 mella; pali penultimate and well developed. 



This genus was known by one species hitherto, described from 

 the Miocene of Mayence, but said to be identical with one very 

 common at Port Jackson (Sow and Pigs reef, about 16 fathoms.) 

 I do not believe that the species are identical, but the diagnosis 

 of M. Milne Edwards is so very meagre that I give the specific 

 name with my notes for other naturalists to follow up. " Cono- 

 cyathus sulcatus, d'Orbig. in M. Ed. 8f H., Poly. foss. des. terr. 

 palceoz., p. 20, 1851, also a" Orb. Trod, de Faleont. torn. 3, p. 145, 

 1852. M. Ed., remarks that this species resembles Turbinolia 

 dispar exteriorly, except that the costse are a little less thick and 

 fewer ; three complete cycles ; septa unequal, somewhat thick ; 

 six broad and thick pali, in front of secondaries." Hist. Nat. 

 des. Cor., Vol. 2, p. 25. My diagnosis is : — Corallum of regular 

 conical form, not much elongated ; base less than half the width 

 of the calice ; transverse section perfectly circular throughout ; 

 costaa numerous, forming four cycles closely set, equal, some- 

 what projecting, the secondaries arising from the base and being 

 with the first thicker at their origin, becoming sharp and thin 

 higher up, tertiaries arising a short distance from the base, but 

 those of the fourth order at about a third and the fifth in the 

 upper half of the corallum ; intercostal furrows about width of 

 costaa, not very deep, with a regular single series of rather dis- 

 tant pores (?) ; scarcely any perceptible calicular fossa ; columella 

 undistinguishable as the septa all unite in the centre, but there 

 are two small lobes visible in a depression in the centre of the 

 pali ; septa in six systems of three cycles, and there are none to 

 correspond with the fourth cycle of costse. The secondaries are 

 thinner until united with their pali, which rise in high falcate 

 crests round the centre, being much more exsert than any of the 

 septa ; the primaries are more exsert and larger in size than the 

 secondaries, and the tertiaries bend regularly round and unite 

 with the pali, being thickened at the point of junction ; pali 



