FROM THE UPPER GREENSAND. 21 
The species has great resemblance to the lower part of Ozxchotrochus serpentinus, 
nobis. Very careful examination of sections and calices proves that there is no columella, 
that the inner ends of the septa produce a false one, and that the styloid appearance is 
due to fossilization. 
The discovery of better specimens may, perhaps, lead M. de Fromentel to consider his 
Stylotrochus, which resembles this form, to be of the same genus. 
Famity—ASTRAID A. 
Division—StTyYLINACEA. 
Genus—Cyatnopuora, Michelin. 
This genus has the usual characters of compound Astreine, but the dissepiments act 
as tabul, and shut in the calice below, just as in some of the Liassic /sastree. There 
is no columella. The curved dissepiments are not noticed, and the family of the genus 
must remain unsettled, for the minute structure is clearly tabulate. The genus flourished 
in the Lower and Middle Oolites, and the only Cretaceous species is that under considera- 
tion, and which has been described by D’Orbigny from the Craie tuffeau of Martigues. 
1. CyarforHora mMonticuLaRiA, D’Oréd., sp. Pl. VIII, figs. 15—18. 
The septa are rather thick. 
There are three cycles, but the third is often deficient in one or two systems. 
Locality. Waldon. In the Collection of the Geological Society. 
Division—F aviacek. 
Genus—Favia, Ehrenberg. 
This genus has absorbed the Parastreacee, so that the old Parastrea stricta, Kd. and 
H., is now named Favia stricta, Hd. and H. 
