THE HEXACTINELLID SPONGE CYATHOPHYCUS FROM THE LOWER-MIDDLE ORDOVICIAN VININI FORMATION OF CENTRAL NEVADA

The new species Cyathophycus pseudoreticulatus and a fragment of Cyath ophycus reticulatus? Walcott, 1879, are described and reported from th e lower part of the Upper Member of the Vinini Formation from black sh ale of late Whiterockian age. The sponges were collected from the nort h fork of Vinini Creek, in the north-central part of the Roberts Mount ains, Eureka County, Nevada.