Fisher, W. K., MacGinitie, G. E. (1928). The natural history of an echiuroid worm. Annals and Magazine of Natural History (Series 10). 10(1): 204–213, plate X.
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Fisher, W. K., MacGinitie, G. E.
1928
The natural history of an echiuroid worm
Annals and Magazine of Natural History (Series 10)