213 



PlaeotPOehUS inflectUS, spec. nov. Pi. ii., figs. 2a, 6, c. 



The corallum ig slightly curved, and tapers regularly to a 

 >small flaltly pointed base. It i^ compressed, and its iateral edges 

 are ridged by projecting costae. The^ wall is moderately stout, 

 and is covered by a strong epitlieca having transverse chevron 

 markings. The calice is ellijptioal with its axes in the ratiO' 

 •oi 100 to 87. 



There are six systems of septa with four icycles, but the 

 fourth cycle is only developed in the end systems, each of which 

 occupies a larger space in the calice than a central one. Tlie 

 firsit and second orders are stout and equal, but the third and 

 foiurth are very thin lamellae. The sides of all the septa are 

 sparsely granulated. A prominent lamellar columella projects 

 above the septal ends, to which it is fused inferiorly. 



Only four examples of this coral have been collected, and 

 tiheir calices are all more or less worn. 



Costae answering to the first two orders of septai are repre- 

 sented on the wall by broad ridges, which are marked at in- 

 iiervals by the arched crests of the epithecal ornament. 



Height of corallum, 16 mm. ; length of calice, 7.5 mm. ; 

 breadth of calice, 6.5 mm. 



Locality, &c. — ^Rare in the Eocene clays at Brown's Creek, 

 Aire E-i. district. 



CePatOtPOChUS ClinatUS, s/?ec. now Pi, ii., figs. 3a, 6, 



The corallum has an arched outline, is free, twice as long 

 as broad, and tapers gently to an abrupt base, which is about 

 two-thirdg of the calice in size. A younger and narrower 

 individual has the curve of the corallum continued fully one- 

 third further, and tapers off more rapidly to' a rounded point, 

 thus becoming slightly longer than the older form. The 

 latter ha® not been fractured during fossilization,, as the; under 

 ;surfac:e at tlie base is covered by the epitheca. The calice is 

 subplane and elliptical, its major and minor axes being as 

 100 to 77. 



There are in all 38 sieptai, and the number on either' side 

 of the longitudinal axis is unequal. They are in six systems 

 with four cyclesi, but the quaternaries are developed in the 

 end systems only, while one of these is incomjplete in regard 

 to two septa. For the size of the coral the septa are stout, and 

 the calice is well fi.lled by them. The primaries and secon- 

 daries are equal, and the others diminish according to order. 

 All are exsert, more or less curved, and marked, by several 

 rows of siniall granules. The columella is short, but broad, 

 lobed at its free surface, and fascicular inferiorly. In the type, 

 which has otherwise an almost perfect calicei, only one out 

 of three lobe^ is intact, buti the fractured surfaces of the others 



