INTRODUCTION. Ixiii 



Family X. 

 SERIATOPORIDvE. 



Corallum arborescent or bushy, with an abundant compact coenenchyma. Visceral 

 chambers filling up by the growth of the columella and the walls, and showing but few 

 traces of tabulae. 



1. Genus Seriatopora. 



Lamarck, Hist, des An. sans Vert., vol. ii, p. 282, 1816. 



Corallum arborescent, with echinulated branches. Calices arranged in ascending series. 

 Septa scarcely visible. Columella large and compact. 



Typ. sp., Seriatopora subulata, Lamarck, loc. cit., p. 282. 



2. Genus Dendropora. 



Michelin, Icon. Zooph., p. 187, 1845. 



Corallum arborescent, with very delicate smooth branches. Calices distant, and sur- 

 rounded by a narrow, obtuse margin. Septa small, but distinct. 

 Typ. sp., Dendropora explicit a, Michelin, op. cit., pi. xlviii, fig. 6. 



3. Genus Rhabdopora. 



Milne Edw. and J. Haime, Comptes rend., t. xxix, p. 202, 1849. 



Corallum with prismatic echinulate branches. Calices arranged in series. Septa very 

 distinct. 



Typ. sp., Rhabdopora megastoma ; Dendropora megastoma, M'Coy, Ann. and Mag. of Nat. Hist., 

 2d series, vol. iii, p. 129. 



Family XI. 

 THECID^E. 



Corallum massive, with an abundant, compact, spurious coenenchyma, produced by tlit- 

 septa becoming cemented together laterally. Tabula numerous. 



Genus Thecia. 

 Milne Edw. and J. Haime, Comptes rend., t. xxix, p. 263, 18-19. 



Septal system highly developed. Calices shallow, with a very small deep fossula. 



Typ. sp., Thecia Swindemiana ; Agaricia Swinderniana, Goldfuss, Petref. Germ., pi. xxxviii, fig. 3; 

 Porites expatiata, Lonsdale, ap. Murchison, Sil. Syst., p. 678, tab. xv, fig. 3. 



