50 PEor. p. MABTiN Duncan's eevision of the 



with simple gemmation, tlieir close allies, must belong to another. 

 Hence the three original great groups of Edwards and Haime form 

 one family, the Astraeidae, and it is divided into seven Subfamilies. 

 The Subfamilies are divided into Alliances, the genera of which 

 have their species divided into tribes which are distinguished by 

 the presence or absence of entire septa. 



IV. Family ASTR^ID^. 



1. Subfamily AstrceidcB simplices. 

 Simple solitary Astrseidae with entire or incised, dentate or 

 spinulose septal edges. Propagation by ova and rarely by deci- 

 duous buds. Pali may or may not exist. Eudotheca always 

 present, but variable in amount. 



Alliance I. Trochosmilioida. 

 II. Placosmilioida. 



III. LiTHOPHYLLIOIDA. 



IV. ASTEROSMILIOIDA. 



Group V. Genus Axosmilia. 

 Each of these Alliances is divided into two tribes, one of which 

 receives genera with entire septa, and the other contains genera 

 with dentate septa. 



There are six genera which become subgenera, and fifteen genera 

 are absorbed. 



I. Alliance TROCHOSMILIOIDA. 

 Simple corals with entire or dentated, incised, ragged, or spined septa. 

 Endotheca. Columella absent or rudimentary. Costse distinct. With or 

 without epitheca. Pali absent. 



Tribe I. With entire septa. 



„ II. With dentate, incised, ragged, or spined septa. 

 I. Genus Trochosmilia, Ed. &H. 



Subgenus Epismilia, E. de From. 

 Subgenus Ccelosmilia, Ed. & H. 

 Genus Diploctenium, Goldfuss. 



