78 THE FOSSIL COKALS AND 



Breadth of the corallum more than 5 inches ; height of corallum 1 inch. 



Breath of a series yq inch. 



Locality. Baran Eiver, south of Tong, in the Nari series. Survey-number G ^•- 



Illustrations of the Species in Plate X. 

 Fig. 15. Part of the corallum: natural size. 

 16. Part of a series : magnified. 



Genus PEIONASTE^A, M. Ed. & J. H. 



1. Pbionaste^a insignis, Duncan. Plate V, Figs. 4-6. 



The corallum is free, short, hemispherical, and has a flat, irregularly rounded, and 

 lobed base, and a few large calices. 



The base is marked with numerous subequal low costae, more or less hidden by a 

 feeble epitheca. 



The calices near the base look outwards, and the others more or less upwards ; 

 they are irregular in size and shape, but are large, deep, open, triangular or hexangular, 

 and are separated by stout and tall margins. 



The septa are much more numerous on the sides of the tall margins than in the 

 midst of the calices ; they are small and close in the first place, and large, separate, and 

 mostly club-ended in the other. There are altogether nearly five cycles in the largest 

 calice, but only some twenty septa reach the boundary of the axial space. The club 

 end represents the base of a former spine, and the septa having it are large and dip 

 down into the fossa, being, moreover, separated at the wall by small ones. The colu- 

 mella is small, and is partly made up of the united club ends. 



The margin of the calices is rather sharp and crestiform. The gemmation is 

 marginal and between contiguous calices. 



The breadth of the base is 1 J inch, and the height of the corallum ^ inch. The 

 calices vary from t^ to t% inch in length, and the greatest depth of the fossa is -j^ inch. 



Locality. South-west of Dharan Pass, Nari group. Survey-number G ■^^. 



Illustrations of the Species in Plate V. 



Fig. 4. Upper part of the corallum : natural size. 



5. The calices near the margin : magnified. 



6. The base : natural size. 



2. Prionastk^a TEiroiSEPTATA, Buncan. Plate V, Figs. 1-3. 



The corallum is irregularly quadrangular at the base, the corners being rounded 

 more or less. A small scar of former adhesion is in the middle of the basal surface, 

 and small and rather close costse radiate from it, increasing in number towards the 

 edge, which is rather sharp. There is a slight epitheca here and there, and the basal 

 surface is flat. 



The calicular surface of the coral is but slightly convex, and the calices are large 



