FOSSILS OF THE DEVONIAN. 101 
ous transverse diaphragms, the general size of the cells, and the mode of 
growth, the species is similar to the European form of I’. basaltica. 
Formation and localities —Lower horizon of the Devonian limestone at 
Lone Mountain, 18 miles northwest of Eureka; at the head. of the Reese 
and Berry Cation, and on the ridge of Atrypa Peak, Eureka District, Nevada. 
Favosites, n. sp. 
Corallum growing in hemispherical or irregularly formed masses made 
up of small tubes varying in size from 1™™ to 1.5", which are without any 
distinct arrangement in relation to size, the smaller cells occurring together 
or with the larger interspersed among them. On the upper surface of the 
corallum the cell walls are thickened and have a beaded appearance which 
is not observed in a transverse section of the tubes a short distance below 
where the walls are strong and the tubes distinctly polygonal and not 
rounded as at the apertures, Transverse diaphragms entire, closely ar- 
ranged or separated up to a distance equal to an entire diameter of the tube 
Mural pores not well determined, but there is apparently a single row of 
rather large size on each side. 
The largest fragment obtained has a depth of 8™, and the diameter of 
the entire corallum was from 15™ to 20. 
In the character of the cell-walls at the surface of the corallum, the 
diaphragms in the tubes, and form of growth, this species is not unlike 
Favosites? Argus Hall, of the Hamilton Group of New York, but in the 
small size of the cells, and the absence of the very large cells among the 
smaller ones in the latter species, it is very distinct from it. 
Formation and locality—Lower horizon of the Devonian limestone at 
Lone Mountain, 18 miles northwest of Eureka, Nevada. 
Fistulipora, sp.? 
Silicified specimens of a well-characterized species of this genus occur 
in association with fossils of the Upper Helderberg horizon. Its specific 
relations are not yet determined. 
Formation and locality—Devonian limestone, lower horizon, Atrypa 
Peak Ridge, Eureka District, Nevada. 
