261 



Locality, d'c. — Fairly common in the Eocene of Muddy 

 Creek, Spring Creek, Shelford, and Mitchell R. ; less so at 

 BiiTegurra, Corio Bay, and Moorabool Valley. The type is 

 from Spring Creek. 



This species is closely allied to the recent C. Zelandicz, Dun- 

 can,'^ but the latter is generally larger, and, besides, shows no 

 intercostal pores or dimples. The costce are similarly arranged 

 in both. Duncan says that there are in his species rudimen- 

 tary septa corres(ponding to the fourth cycle of costse, but I 

 have not observed them. My specimens are not from New 

 Zealand, but from Port Jackson, New South Wales, and were 

 obligingly presented to me by Mr. C. Hedley. 



('. ci/cIosfatu>>\ T. Woods'! a common Muddy Creek coral, dif- 

 fers from C. scrohk'idatus in being larger, and compressed, with 

 an elliptical calice. It exhibits also the same costal peculiari- 

 ties. 



Ceratotpochus exilis, ^ptc. nov. 



PI. vi., figs. 2a, h. 



Corallum small, slender, cui^ed or nearly straight, and 

 gradually tapering to the pedicellate base. 



Wall thin and covered by a transversely ridged epitheca, 

 which, by wearing, becomes (pitted with longitudinal lines of 

 minute pores between the mural borders of the septa. 



Calice circular. The septa are thin, wavy, granular, and in 

 six systems, with three cycles. The primaries and secondaries 

 are frequently lobed at their central ends; they are equal 

 in size, and the tertiaries are not much smaller. The colu- 

 mella consists of a few comparatively large aaid variously 

 shaped papilli. There are seven of these in the type, but some 

 examples show only three or four. 



Height of corallum, 9 mm. ; diameter of calice, 2.5 mm. 



Locality, dsc. — Eocene at Cape Otway, Wilkinson's No. 4 

 section. Brown's Greek, Hamilton Creek, Gellibrand River, 

 Fishing Point, Spring Creek, Shelford, Corio Bay, Curlewis, 

 Mornington, Lower Maude. Rare in all the sections except 

 the first, which is the locality of the type. 



This coral is distinguished from the allied form identified 

 by Duncan as C. typus, Seguenzai, 'var. Australiensis ; by its 

 slender, regularly tapering outline. Its columella also con- 

 tains fewer papilli, and the septal orders vary less in length. 



* Deep Sea and Littoral Corals. Proc, Zool. Soc. London, 1876, p. 431, 

 pi. xxxviii., flgs. 1-3. 



t On some AustraHan Tertiary Corals. Roy. Soc. N.S.W., vol. IX., 

 p. 188, pi. i., figs. 2, 2a. 



X Australian Corals. Q. J.G.S., vol XXVI., pp. 298-9, pi. xk. fig. 8. 



