92 THE FOSSIL COEALS AND 



niustrations of the S^pecies in Plate XXI. 

 Fig. 3. Part of the corallum : natural size. 

 4. Calices: magnified. 



3. Plesiaste^a pedunculata, Duncan. Plate XXI, Fig. 9. 



The corallum is short, large, circular in outline, slightly irregularly convex or 

 plane above, pedunculate, and with an epitheca in longitudinal folds, the costse being 

 slightly visible. The calices are large, very irregular in size and shape, not standing up 

 much above the common surface on which their costse pass, shallow, and with large 

 septa and very small pali. The septa in the largest calices are nearly equal ; but usually 

 a small septum is between the large, so as to make four cycles or more. The costse are 

 large, bluntly spined, and a rudimentary one is often between two larger. 



Height of corallum If inch ; breadth 5 inches. 



Breadth of calice ^ to -5^ inch. 



Locality. South-east of Bill, Gaj series. Survey-number G ^. 



Illustration of the Species in Plate XXI. 

 Fig. 9. Some calices : magnified. 



D'ACHIAEDIA, gen. nov. 



' The corallum is massive. The corallites are small, slightly exsert above the thick, 

 solid, common upper exothecal intercorallite coenenchyma, or are imbedded, as it were, 

 in it ; they are long and slightly costulate. The calices are shallow, and there is a 

 columella, and some pali are also seen. Fissiparity occurs, but is rare. 



1. D'AcHiAEDiA DENSA, Buncan. Plate XXI, Figs. 5, 6. 



The corallum is large, irregularly cylindrical, and roundedly conical above. It 

 is covered with numerous calices, most of which are shallow and circular, and sepa- 

 rated by more or less granular surface. 



There are three cycles of septa, which are alternately long and short, pali being 

 usually before the larger. 



The columella is small. The costse are distinct on the flanks of the corallite, 

 but not on the coenenchyma. The coenenchyma is very solid; 



Height of the corallum 5 inches. 



Breadth of the base nearly 2^ inches. 



Breadth of a calice -f^ inch. 



Locality. Nari Nai, Khirthar range, Gaj series. Survey-number G ^-§-8-. 



Illustrations of the Sjpedes in Plate XXI. 



Fig. 5. The corallum : natural size. 

 6. Calices: magnified. 



