40 THE FOSSIL COEALS AND 



rounded-off edges and a slightly concave central part, marked witli concentric ridges. 

 The upper surface of the corallum slopes for a short distance from the base, and is then 

 broken up into many series, some of which are long and others very short, some being 

 straight and others curved. The calices are perfectly indistinct, and the costae of 

 the coUines and monticules are alternately large and small, slightly projecting, and 

 in number about ten large ones and as many small in half an inch. They pass up- 

 wards from considerable depths, and form, with those of the neighbouring series, thick 

 nodular, and long and short, broad and narrow coUines, with a rather sharp or a nodular 

 summit. The valleys are very deep, reaching down from -j^ inch to 1 inch ; and the 

 septa are granular at the edge, project but slightly, have some endotheca between 

 them, come close together along the floor of the series, and have a projection there. 

 There is a distinct thin lamellate columella, which is very continuous. The costse 

 of the base cover its upper sloping portion, and are seen around the edge ; they are 

 small, subequal, slightly prominent, and have exotheca regularly placed concentrically 

 between them. There are traces of an epitheca. 



Height of the corallum 2^% inches. Length of base 3^ inches. 



Breadth of base 3^^ inches. Length of longest coUine 1 J inch ; of the shortest 



2 -•. 

 To 



-^ inch. 



380 

 127' 



Locality. Hills east of Lynyan, Eanikot group. Survey-number G 



Illustrations of the Species in Plate VHI, 



Fig. 1. The corallum : natural size. 

 2. A series : magnified. 



Subfamily ASTB^AGE^. 



Genus STEPHANQCCENIA, M. Ed. 8r J. K, amended. 

 (Shown to have incised and ragged septal edgings.) 



1 . STEPHANOCffiNiA MiCKOTUBERCULATA, Buncan. Plate XV, Figs. 14-16. 



The corallum is large, rather flat, slightly irregular on its calicular surface, and 

 incrusts. 



The calices are irregular in shape, although regular in size, and are in hexagons 

 pentagons, or are indefinitely square and circular ; they are shallow, open, and are sepa- 

 rated by stout, equal margins, which are minutely granular and marked vsdth enlarged 

 septo-costal swellings. The septa are delicate, rather large near the wall, then thin 

 and finally expand near the axial space to unite and form a kind of paliform collar 

 around the extremely small, tubercular-looking, essential columella. There are twelve 

 larger septa, which reach the axis, or one or two may occasionally join others before 

 doing so. Twelve smaller septa, often very small, intervene ; and thus there are three 

 cycles, the primaries and secondaries being nearly or quite equal. The axial part 



