FOSSILS OF THE DEVONIAN. 
PORIFERA. 
Genus PALZOMANON Roemer. 
Palzeomanon Roemeri, n. sp. 
Plate xiii, fig. 12. 
This is a crateiform or cup-shaped sponge of the general form of those 
referred to the genus Manon of the Jurassic and Cretaceous, and for the 
reception of the Paleozoic types of which Dr. Roemer founded the genus 
Palzeomanon, making P. cratera of the Niagara Group the type. 
The example of P. Roemeri before me has a height of 65™", and a diam- 
eter of 50™™, contracting below to form a rounded base; the outer wall 
extends vertically to within a short distance of the summit, where it curves 
inward to the rounded marginal rim of the shallow cup; this has a depth of 
-15™, Owing to the complete silicification and change of the original 
spicul, none of the surface characters have been preserved; the unmis- 
takable, striking form serves for the generic and specific identification. 
Formation and locality—lLower horizon of the Devonian limestone at 
Lone Mountain, 18 miles northwest of Eureka, Nevada. 
Genus ASTYLOSPONGIA Roemer. 
Astylospongia, sp. ? 
Several specimens of arather small, globose or flattened oviform sponge 
were obtained from the center of cherty concretions. The largest has a 
diameter of 30™™, and presents in a transverse section numerous fine, radi- 
ating tubes or canals studded with fine spicule. Owing to the imperfect 
preservation of all the specimens, it is impossible to determine their specific 
relations to forms already described. 
Formation and locality—Lower horizon of the Devonian limestone at 
Lone Mountain, 18 miles northwest of Eureka, Nevada. 
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