Astraea coetata , Ast rasa ant Ilia rum , and Heliastraea insignia 
of Duncan, probably should b© placed in the synonymy of 0» cavernosa? 
however, as X do not feel confident of their relationship, they will 
be t ranted as separata specie®. 
y 
this discussion may be closed by stating that Verrill has named 
1/ Trans. Conn. Acad. Sci. , vol. si, p. 101, 1902. 
Queloh* s Orbicslla cavernosa from off Barra Grande, Brasil, 30 fathoms 
deep* &. bras.1 liana , without giving a description. Ho quotes fro® 
Quelch that its exotheea is so vesicular as to partly hide the cos- 
tae? and that its septa are uniformly thickened. 
Localities * Recent . The Caribbean and Gulf region© wherever 
coral reefs are particularly developed? also the coast of Bra* il. 
fossil . The Pleistocene reefs of the Antilles. 
Also the Oligocene of Scrro Colorado, Aruba* Antigua? Dares, Porto 
Rico; Anguilla? Tampa, Flu.? lb miles south of Valdosta, and along 
the flint River in the vicinity of Bai abridge , Ga. 
Geologic distribution*- Fro® the upper Oligocene to Recent. 
VarMies of Orb i cell a cavernosa. 
The material before ®e seams to warrant the recognition of at 
least four varieties? by reference to the descriptions and notes 
that precede, it will b® seen that they are not of specific value. 
