Two new genera, Dyticospirifer and Eurekaspirifer, are proposed for forms known from central Nevada. Dyticospirifer has as its type species D. mccolleyensis n. sp. which is known only from the Trematospira zone of Oriskany (late Siegenian) age. Eurekaspirifer is based on 'Spirifer' pinyonensis Meek and is restricted to its nominal zone of Emsian age in the Sulphur Spring Range. Reports of E. pinyonensis beyond the Sulphur Spring Range are in error--the forms proving to belong to an undescribed species of Brachyspirifer.

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