850 PROCEEDINGS OF THE NATIONAL MUSEUM. 



the septa are thicker, in three c'3'cles, and the calicular fossa is shal- 

 lower. A. ratlihari! is more elosely related to AxtraiH/ia Uneata 

 (Conrad) from the Chesapeake Miocene of the eastern United States, 

 but there are important differences. The corallites of A. Uneata are 

 decidedly laroer and are more turbinate in shape. 

 This species is named for Dr. Richard Kathl)un. 



EXPLANATION OF THE PLATES. 



Platk LXXVIL 



FiojH. 1, 2, ?t, < '(nioct/dthitii hotnersi, new si)ecies. Fig. 1, a iside view of the coralluni, 

 natural .size; fig. 2, side view of a corallite, x 4; tig. 3, calicular view of a coral- 

 lite, X 4. 



Figs. 4, 5, 6, Astrangia brasUienfiix, new species. Fig. 4, view of a colony from above, 

 natural .size; fig. 5, calicular view of two corallites, x 4; tig. 6, view of the side 

 of the same corallites, x 4. 



Pl.vtk LXXVIII. 



Astraiif/!a rdtlihuni, new species. Fig. 1, corallum, natural size; tig. 2, calices, x 4; 

 tig. 3, costa', X 4. 



