Stephen, A. C. (1941). The Echiuridae, Sipunculidae and Priapulidae collected by the ships of the Discovery Committee during the years 1926 to 1937. Discovery Reports. 21: 235–260, plates VII, VIII.
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Stephen, A. C.
1941
The Echiuridae, Sipunculidae and Priapulidae collected by the ships of the Discovery Committee during the years 1926 to 1937