fAMILIBS AND GEKEEA OJP THE MADEEPOEAEIA. 77 



Genus Pleurophyllia, E. de From. 

 Genus Dendrocora, Duncan. 

 Genus Dactylosmilia, d'Orb. 

 Genus Hymenophyllia, Ed. & H. 

 Genus Rhabdophyllia, Ed. & H. 

 Genera absorbed : — 



Aplophyllia, d'Orb.; Caulastr^a becomes a sub- 

 genus. 



Tribe I. 



Genus Eusmilia, Milne-Edwards ^ Jules Saime, Sist. Nat. 

 des Gorall. vol. ii. p. 18.6 (1857 ; founded 1848) ; amended. 



The colony is caespitose in shape, and tlie brandies are diclioto- 

 mous or trichotomous. The base increases but slightly with age, 

 and the subcylindrical corallites increase in height, multiply iis- 

 siparously, and speedily become separate. The calices are large, 

 somewhat irregular in outline owing to fission, but are generally 

 elliptical. The columella is composed of a lax, broad tissue, and 

 is at the bottom of a deep fossa. The septa are entire at their 

 upper edge, are well developed, thin, narrow, and slightly gra- 

 nular. The costae are subcreatiform near the calices, and may 

 become more or less indistinct towards the base. The endo- 

 theca is moderately developed, and there is a pellicular epitheca, 

 which does not pass far up the colony. 



Distribution. — Fossil. Antillian Pliocene. — Mecent. Caribbean 

 Sea. 



Eusmilia alticostata, Ed. & H., has the costae distinct at the base. 



Subgenus Catjlaste^a, Dana, Zoophytes, Winces' s Explor. Eccjped. 

 p. 196 (1846). 



Colony caespitose, with the stems straight or twisted, sub- 

 cylindrical. Calices subcircular, deep. Septa unequal, exsert, 

 subentire, rather numerous. The outer surface of the stems 

 striated or denticulate. 



Distribution. — decent. Pacific, West Indies ? 



The three species included in Caulastrcea, Dana, form a very 

 natural subgenus of Eusmilia. 



Genus Aplosmilia, d'Orbigny, Note sur les Dolyp. foss. p. 6 

 (1849), and Milne-Edwards ^ Jules Uaime, Sist. Nat. des 

 Gorall. vol. ii. p. 189; amended. 



The colony is caespitose, and the branches are dichotomous or 



