262 



Cepatotpochus Halli, spec. nov. 

 PI. vi., figs. 3a, h. 



The corallum of the type is moderately tall, tapering, and 

 cylindro-conical in shape, but my collection also contains short 

 cylindrical corals similar in. other respects and with calices of 

 equal diameter. These are not more than a variety, and may 

 even be young examples of the species. They retain the 

 scar of former attachment, which in the longer, tapering coralla 

 is frequently worn off. At the basal termination of the latter 

 some orders of septa and an incipient columella are occasionally 

 visible. 



Calice sub-jplane and almost circular, the ratio of the major 

 and minor axes being as 100 to 93. In the short specimens 

 the calice is rarely more elliptical. Septa stout, equal, and in 

 six systems with three cycles. The primaries remain free till 

 they reach the columella; the tertiaries bend towards and 

 usually unite with the secondaries, which then generally, but 

 not uniformly, become stouter. In the type the secondaries 

 after their union with the tertiaries are exceptionally stout. 

 All the septa are characteristically beset with long and stout 

 spines, placed at right angles to their sides, and in rows parallel 

 with their upper margins. 



The columella is essential and fascicular, and consists of irre- 

 gular processes, which, though connected with the first and 

 second orders of se,pta, are independent structures. In one 

 example the columella has nodules on its upper surface. 



The wall is stout and covered by a strong epitheca. The 

 costse, which correspond with the septa, are represented by 

 rounded elevations, broad at the summit, and gradually becom.- 

 ing smaller towards the base. They are crossed by a series of 

 arched, slightly raised lines or ridged of epitheca, some of which 

 are stronger than the rest. 



Height of corallum, 9.5 mm.; diameters of calice, 3.75 mm. 

 and 3.5 mm. The dimensions of the calice remain fairly con- 

 stant in the examples, but the height varies from that given 

 above for the type down to about 2 mm. in the variety men- 

 tioned. 



Locality, d:c. — Rare in the Eocene of Spring Creek, near 

 Oeelong. One example also from Brown's Cteek, and another 

 fromi Altona. Bay. 



The species name is in com,pliment to Mr. T. S. Hall, who has 

 placed his interesting collection of tertiary corals at my service. 



The next coral to be described I place in the genus Cyatho- 

 smilia, which was established in 1878 by Ten. Woods for the 



