136 TABULATE CORALS. 



sented by from three to five longitudinal ridges, which appear 

 to be confined to the thickened outer portions of the tubes, and 

 which form a corresponding number of teeth projecting into the 

 calice. Ordinarily there are two of these teeth on one lip of 

 the calice, and one on the other ; but there may be three teeth 

 on one lip and two on the other, or even more of these projec- 

 tions may be present. 



Obs. — I have some doubt as to the propriety of identifying 

 my specimens with Cceniies linearis, E. and H., which is de- 

 fined as follows (Brit. Foss. Cor., p. 277) : — 



" Corallum massive, convex, or subgibbose, and composed of 

 thin superposed layers. Calices closely set, not prominent, or 

 but very slightly so, linear, with their margin very obscurely 

 denticulated, about half a line broad, and one-twelfth in the 

 contrary direction." 



My specimens agree with the above description in the linear 

 form of the calices, and in the dimensions of these apertures ; 

 but the calicine teeth are very well marked (in well-preserved 

 examples), and the corallum, though sometimes sublobate, 

 could certainly not be properly said to be " massive." The 

 great majority of the specimens which I refer here have the 

 form of thin lamellar or palmate expansions (PI. VII., fig. i), 

 two inches or more in width, with a thickness of a line and a 

 half to two lines. The corallites in the centre of the frond are 

 nearly or quite parallel with the flat surfaces of the latter, and 

 they diverge outwards to open either on one surface only, or 

 apiDarently more generally upon both surfaces. Sometimes, by 

 the superposition of several laminae, the corallum may attain a 

 thickness of four or five lines ; and the same dimensions are 

 sometimes reached when the corallum has the form of a broad 

 flattened or palmate stem. I have never seen any truly mas- 

 sive example. Upon the whole, however, considering the points 

 of likeness between the two, I think it safest to refer my 

 specimens to C. linearis, E. and H., and to regard the speci- 

 men described by Edwards and Halme as probably excep- 



