The measurements presented by Poulsen for 4 species of Proliostracus are compared statistically and graphically, and it is concluded that only one species is represented. The name Proliostracus strenuelliformis is selected, with the names P. rosenkrantzi, P. liostracoides, and P. noe-nygaardi suppressed as synonyms. The meaning of the regression equations is discussed for each pair of dimensions.

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