New Carboniferous lungfish material is described and Figured, including Prosageno-dus? castrensis sp. nov., founded on a tooth plate from the Chester; a skull roof from the Pennsylvanian of Illinois assigned to S. serratus; a tooth from the same period and region described as Proceratodus carlinvillensis, gen. et sp. nov.; and S. ciscoenis sp. nov., from the summit of the Cisco of Texas. Prosagenodus gen. nov. is proposed, with Ctenodus interruptus Barkas as genotype. The North American Pennsylvanian and Permian dipnoans are reviewed.
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Romer et al. (1934) studied this question.
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