BY F. CHAPMAN. 393 



Ch^etetes stelliformis, sp.nov. (Plate xlii., figs. 1-3). 



Description. — Corallum mas.sive, moderately large. Corallites 

 crowded, .slender, and gently curved. In cro.ss-.section roundly 

 polygonal and occasionally elongated, averaging about 0-5 mm. 

 in diameter; with one to four, but generally three, blunt peg- 

 like teeth projecting into the cavity, representing imperfect 

 fission of the calices by longitudinal partitions on the calicular 

 wall. Tabulai well developed, from 05 mm. to 1-5 mm. apart, 

 sometimes in continuous planes across the corallum, but often 

 more irregular and strongly curved. Unlike other species of 

 ClKtfples, a fine but distinct dark line is seen dividing the walls 

 of the cells (see remarks antea). 



Observations. — This coral is of the type of the abundantly dis- 

 tributed Cluvietes radians Fischer, from the Lower Carboniferous 

 of Hussia, England, and elsewhere,* but is distinct in many 

 points, as in the more roundly polygonal calices, the more 

 numerous longitudinal partitions appearing as projecting tooth- 

 like processes in cross-section, and in the strong fusion-points 

 where calice-wall and tabulae meet. In longitudinal section, this 

 latter feature is verj^ marked, and, at the point of junction, forms 

 a stout cross with pointed arms. 



ChceteteK depressus, Fleming sp.,t is characterised by much 

 smaller calices, measuring 0*2 mm. to 0'26 mm., or about 

 one-half the diameter of C. stelliformis. The diameter of the 

 calices in C. radians, on the other hand, is practically the same 

 as that in C. stelliformis, viz., about 5 mm. In the excellent 

 figures of C. radians given by Dr. Nicholson in his " Tabulate 

 Corals,"; those of the Russian Carboniferous specimens show a 

 much thicker calicular wall than in C. stelliformis, whilst the 



» Oiyct. de Gouv. de Moscou, 1837, p. 160, PL xxxvi., fig. 6. See also 

 Lonsdale, in Murchison, Verneuil and Keyserling, Geol. Russia in 

 Europe, Vol. i., 1845, p.595, PI. A, fig.9. 



t Favosites depressns Fleming, Brit. Anim., 1828, p. 529. F. capillar is 

 John Phillips, Geol. Yorkshire, 2nd Pt., 1836, p. 200, PI. iii., figs. 3-5. 

 Alveolites clepressa Fleming sp., Edwards and Haime, Mon. Brit. Foss. 

 Corals, Pt. iii.; Mon. Pal. Soc, 1852, p. 158, PI. xlv., figs. 4, 4a. 

 :*; Supra cit., PI. xii., figs. 4, ^a-d. 



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