ii2 Papers from the Marine Biological Laboratory at Tortugas. 



of College of Science, University of Tokyo, vol. 17, article 2, 37 pp., 2 

 plates. 



The Pacific palolo has been treated of by numerous writers, the most 

 important modern accounts being those of B. Friedlander, 1898, Biolog. 

 Centralblatt, Bd. 18, pp. 337-357, 2 figs.; of Collin, 1899, in Kramer's Ban 

 cler Korallenriffe, pp. 164-174, and of W. McM. Woodworth, 1903, Ameri- 

 can Naturalist, vol. 37, pp. 875-881. i fig. and 1907, Bulletin Museum 

 Comparative Zoology at Harvard College, vol. 51, pp. 1-22, 3 plates. 



Lvsidice oele, the " wawo " of Amboina, Malay Archipelago swarms on 

 the second and third nights after the full moon of March and April. It is 

 described by R. Horst, 1905 (Over Wawo (Lysidice ock n. sp.) Rumphius 

 Gedenkboek, Kolon. Mus. Haarlem, pp. 105-108). 



EXPLANATION OF THE PLATE. 



[The drawings are from life by the author.] 



FIG. i. Mature male with posterior sexual segments still attached. They are destined 

 to break away at the point a. 



FIG. 2. Female sexual segments swimming through the water, showing rolling, twist- 

 ing movement of worm as it progresses backward. 



FIG. 3. Torn and shrunken sexual segments sinking to bottom to die after having 

 discharged the sexual products. 



FIG. 4. Enlarged photograph of an immature male worm, 1.5 times the natural size. 

 This worm was still alive when photographed. 



