374 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvm. 



1. Subfamily Pseudoastraeinm: "Coralluin simple or compound. 

 Septal apparatus trabecular, porous. Calices in the compound forms 

 confluent, not separated by walls or ])y true ccjenench3nna, but united 

 by radial septo-costa?. Pseudosynapticula, or true synapticula, pres- 

 ent alont^side dissepiments." 



la. l^eudoaxtrivhvcV Rcgulares {;=Thanincmrpeinse IaH^^ G[idoli- 

 timv. Verrill): "Trabecuhe composed of regularl}' (symmetrically) 

 grouped calcareous nodules, which are in contact at quite regular 

 intervals, thus forming more or less uniformly distributed rows of 

 pores that run perpendicular to the septal margins. Faces of neigh- 

 boring septa united by pseudosynapticula and dissepiments." 



The P.HeadoaHtrivhiPf Reg id ares are divided into two groups: 



1. Group: "With a pronounced tendency to form more or less 

 compact septa through subsequent deposition of sclerenchyma. Septa 

 not always and then only partialh' perforate." 



oenera: cyclolites, lEptophyllia, thamnastraea, etc. 



2. Group: " No tendency to fill the intertrabecular spaces through 

 subsequent deposition of sclerench3m]a. Septa fine, and regularly 

 fenestrated." 



genera: trocharaea, microsolena, etc. 



lb. Pseud oast V'pe in ce Irreyulares: "Trabecuhe composed of numer- 

 ous irregularly grouped calcareous nodules, which are irregularly 

 fused. Therefore, the intertrabecular spaces (pores) are of very dis- 

 similar size and are irregular in arrangement. Septa united by both 

 true synapticula and dissepiments. The basal part of the septa is 

 often compact." 



genera: haplaraea, coscinaraea, etc. 



II. '^nhi'MmXy Pseudoagaricinx: "Corallum compound, massive or 

 incrusting, never foliaceous or lobed. Septal api)aratus compact. 

 Septa of neighboring calices confluent. Wall absent or rudimentar3\ 

 No coenenchyma. Well-developed dissepiments and true synapticula 

 present." 



genera: astraeomorpha, mesomorpha, etc. 



III. Subfamily Agwricinse Verrill {Lophosermee. Milne Edwards and 

 Haime): "Corallum simple or compound, in the second instance; 

 always more or less foliaceous or lobed, never massive. Septa solid, 

 united by synapticula and sometimes by dissepiments. Common 

 [basal] wall not spinose." 



IV. Subfamily Fangimr Milne Edwards and Haime: "Coralkim 

 simple or compound. Se})ta solid, united b}^ synapticula. Common 

 [basalj wall spinose." 



