MCZ Publications on Sipunculida

• Ward, H.B. 1891. Contributions fromthe Zoological Laboratory. XXVI. On some points in the anatomy and histology of Sipunculus nudus, L. . Bulletin of the Museum of Comparative Zoology, 21(3):143-182 [BHL]
• Ward H. B. 1891. On some points in the anatomy and histology of Sipunculus nudus, L.,. Bulletin of the Museum of Comparative Zoology, 0(0): pp.