Abstract
Ostracoderms from the Up. Silurian, Oesel Isl., Baltic Sea, with data showing their genetic relationship to sea scorpions: Tremataspis milleri (p. 672), Tremataspis mammillata (p. 672), DARTMUTHIA, representing a new family DARTMUTHIDAE (p. 672), in some respects intermediate between the Cephalaspidae and Tremataspidae, with D. gemmifera.

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