BREEDING HABITS OF PLATYNEREIS MEGALOPS. 211 



has described copulation in an annelid, Capitella. Platynereis 

 is of interest in that oviposition so quickly follows copulation. 



III. THE NEREIS FORM OF PLATYNEREIS MEGALOPS. 

 As in the case of Nereis an attempt has been made to rear the 

 larvae of Platynereis. Best results were obtained during 1913. 

 A table was kept of the development of the young worms and 

 their characteristics noted. They closely resemble the larvae 

 of Nereis diimerilii described by Hempelmann which he obtained 

 from his cultures. Some of my worms aged six months measured 

 four centimeters. It is hoped that a study of these forms will 

 give a clue to the swarming habit. 



LITERATURE REFERRED TO. 

 Agassiz, A. 



'62 Alternate Generation in Annelids and the Embryology of the Autolytus 



cornutus. Boston Journal Nat. Hist., Vol. 7. 

 Andrews, A. E. 



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Mus., Vol. 14. 



'92 Eyes of Polychaetous Annelida. Jour. Morph., Vol. 7. 

 Bonnevie, K. 



'08 Chromosomenstudien. II. Heterotypische Mitose als Reifungscharakter. 



Arch, fur Zellforsch., Bd. 2. 

 Eisig, H. 



'87 Fauna und Flora des Golfes von Neapel. Monographic 16: Capitelliden. 

 Gardiner, Ed. G. 



'98 The Growth of the Ovum, Formation of the Polar Bodies, and the Fertiliza- 

 tion in Polychoerus caudatus. Jour. Morph., Vol. 15. 

 Hempelman, Fr. 



'n Zur Naturgeschichte von Nereis dumerilii Aud. et Edw. Zoologica, Bd. 25, 



Lief i (Heft 62). 

 / Izuka, Akira. 



'03 Observations on the Japanese Palola, Ceratocephale osawai, n. p. n. sp. 



Jour. Coll. Sci. Imp. U. of Tokyo, Vol. 17. 

 Lillie, F. R. 



'12 The production of Sperm Iso-agglutinins by Ova. Science, N. S., Vol. 36, 



No. 929. 



'12 Studies of Fertilization, V. The behavior of Spermatozoa of Nereis and 

 Arbacia the special reference to egg-extractives. Jour. Ex. Zool., Vol. 14. 

 Lillie, F. R., and Just, E. E. 



'13 Breeding Habits of the Heteronereis Form of Nereis limbata at Woods 



Hole, Mass. BIOL. BULL., Vol. 24. 

 Mayer, A. G. 



'08 The Annual swarming of the Atlantic Palolo. Publication 102, Carnegie 

 Institution of Washington. 



