134 TABULATE CORALS. 



Ccenites juniperinus, Eichwald. 



(PI. VI, figs. 5, s b). 



Ccenites juniperinus, Eichwald, Zool. Spec, vol. i. p. 179, 1829. 



Limaria dathrata, Lonsdale, in Murchison's Sil. Syst., p. 692, PL XVI., bis, 



figs. 7. 7 a, 1839. 

 Ccenites juniperinus, Milne-Edwards and Haime, Pol. Foss. des Terr. Pal., 



p. 301, 1851 ; and Brit. Foss. Corals, p. 276, PI. LXV., figs. 4 and 4 a. 

 (Compare Limaria ramulosa. Hall, Pal. N.Y., vol. ii. p. 142, PI. XXXIX., 



fig. 4, 1852.) 



Spec. Char. — Corallum dendroid, of cylindrical dichotomous- 

 ly-dividing branches, the diameter of which is generally about 

 two lines. Corallites nearly vertical in the centre of the 

 branches, with thin walls, and about one-sixth of a line in 

 diameter ; gradually diverging in their upward course till they 

 reach a point from one quarter to half a line from the surface, 

 when they suddenly bend outwards, their walls being now 

 greatly thickened, and the visceral chamber reduced to a mere 

 slit. Calices fissure-like and elongated in the direction of the 

 transverse diameter of the branches, their long diameter about 

 one-third of a line ; the lower margin adorned with two pro- 

 minent teeth, while the upper margin carries a single tooth cor- 

 responding in position to the notch between the lower teeth. 

 Tabulse not very numerous, but well developed and complete. 

 Mural pores moderately numerous, circular, not excessively 

 large, irregularly distributed. 



Obs. — This well-known Upper Silurian form is readily dis- 

 tinguished by the external characters of the cylindrical branches, 

 and the long, transversely-disposed toothed calices (PI. VI., 

 fig. 5), which are not elevated above the general surface. The 

 fissure-like calices are generally separated from one another, in 

 a vertical direction, by interspaces varying from about one-fifth 

 to one-third of a line ; and they thus appear as if sunk in a 

 compact smooth ccenenchyma. In longitudinal sections (PI. 

 VI., fig. 5 a) this apparent coenenchyma is shown to be due to 

 a deposit of sclerenchyma within the tube of each corallite in 



