GENERA OF CH^ETETID^ AND MONTICULIPORIDAL. 269 



in its leading characters, that the specific distinctness of the 

 two may well be called in question, but I am unable to offer 

 any definite opinion upon this subject till I may have been able 

 to examine the original specimens of the former species. All 

 that I can say now is, that such specimens as I have seen of 

 the British Carboniferous coral ordinarily called by the name 

 of C. septosus, or Alveolites septosa, seem to be very similar in 

 appearance and structure to C. radians, Fischer, though a 

 microscopic examination may yet show that they are distinct. 



Formation and Locality. Carboniferous Limestone of Mos- 

 cow, Russia. Not uncommon in the Carboniferous Limestone 

 (" Orton Scar Limestone ") of Hardendale Nab, near Shap, 

 Westmorland, and in the same limestone at Penruddock, 

 Cumberland. (Quoted by Milne-Edward and Haime from the 

 same horizon at Kendal, Westmorland.) 



MONTICULIPORIM:. 



Genus MONTICULIPORA, D'Orbigny, 1850. 

 (Prodr. de Paleont, t. i. p. 25.) 



Nebulipora, M'Coy, Ann. Nat. Hist, ser. 2, vol. vi. p. 282, 1850. 

 Orbitulites, Eichwald, Zool. Spec., t. i. p. 180, 1829. 

 Orbipora, Eichwald, Leth. Rossica, t. i. p. 484, 1860. 

 Stenopora, M'Coy ? (non Lonsdale), Brit. Pal. Foss., p. 24, 1851. 



Gen. Char. Corallum very variable in shape, massive, 

 ramose, laminar, frondescent, or encrusting, composed of nu- 

 merous tubular closely-approximated corallites, the walls of 

 which are not amalgamated with one another. Walls imper- 

 forate (so far as certainly known, though one or two forms 

 otherwise undistinguishable from the genus unquestionably 

 possess " mural pores "). Septa entirely wanting. Tabulae 

 always well developed, complete. Corallites usually distinctly 

 divisible into two series, one of large and the other of small 

 tubes, the latter usually more closely tabulate than the larger 

 ones, or otherwise differing from these in structure. Surface 



