INTRODUCTION. Init 
Family X. 
SERIATOPORID. 
Corallum arborescent or bushy, with an abundant compact ccenenchyma. — Visceral 
chambers filling up by the growth of the columella and the walls, and showing but few 
traces of tabula. 
1. Genus SERTATOPORA. 
Lamarck, Hist. des An. sans Vert., vol. i, p. 282, 1816. 
Corallum arborescent, with echinulated branches. Ca/ices 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. Ca/ices distant, and sur- 
rounded by a narrow, obtuse margin. Sepéa small, but distinct. 
Typ. sp., Dendropora explicita, Michelin, op. cit., pl. xlvin, fig. 6. 
3. Genus RHABDOPORA. 
Milne Edw. and J. Haime, Comptes rend., t. xxix, p. 262, 1849. 
Corallum with prismatic echinulate branches. Ca/ices arranged in series. Septa very 
distinct. 
Typ. sp., Rhabdopora megastoma; Dendropora megastoma, M‘Coy, Ann. and Mag. of Nat. Hist., 
2d series, vol. ili, p. 129. 
Family XI. 
THECID &. 
Corallum massive, with an abundant, compact, spurious conenchyma, produced by the 
septa becoming cemented together laterally. Zaéu/@ numerous. 
Genus 'THECIA. 
Milne Edw. and J. Haime, Comptes rend., t. xxix, p. 263, 1849. 
Septal system highly developed. Cadices shallow, with a very small deep fossula. 
Typ. sp., Thecia Swinderniana ; Agaricia Swinderniana, Goldfuss, Petref. Germ., pl. xxxvii, fig. 3 ; 
Porites expatiata, Lonsdale, ap. Murchison, Sil. Syst., p. 678, tab. xv, fig. 3. 
