SPAWNING HABITS OF CH/ETOPLEURA APICULATA. 255 



XXIV. 

 Experiment 24, September 6-J. 



85 Chitons, collected Tuesday, September 6. Placed in three 

 dishes. 



ist night, no eggs. 



2d night, two females spawned in one dish two thirds 

 maximum ; one spawned in another dish one fourth 

 maximum, 8-10.30 P.M.; third dish, no eggs. 



Remark. Experiments for the season closed September 7. 

 For some days there had been indications that the spawning season 

 was nearing its end. Impression of fair spawning activity, al- 

 though from only a few individuals. The experiments show that 

 heavy spawning begins within a few days of full moon and con- 

 tinues to third quarter, or a few days after third quarter. The 

 lightest spawning occurs between new moon and full moon, espe- 

 cially pronounced around first quarter. 



LIST OF PAPERS CITED IN THE TEXT. 

 Collin, A. 



'97 Ueber den Palolowurm. (See Kraemer.) 

 Friedlander, B. 



'98 Ueber den sogennanten Palolowurm. Biol. Centralbl. (Ibid., 1899 and 



1901.) 

 Heath, H. 



'05 Breeding Habits of the Chitons of the California Coast. Zool. Anz. 

 Hemplemann, F. 



'n Zur naturgeschichte von Nereis dumerilii. Zoologica. 

 Hoyt, W. D. 



'07 Periodicity in the Production of the Sexual Cells in Dictyota dichotoma. 



Bot. Gazette. 

 Izuka, A. 



'03 Observations on the Japanese Palolo. Journ. Coll. Sci. Imp. Univ. 



Tokyo. 

 Just, E. E. 



'14 Breeding Habits of the Heteronereis Form of Platynereis megalops at 



Woods Hole, Mass. BIOL. BULL. 

 Kraemer, A. 



'97 Ueber den Bau der Korallenriffe und die Planktonvertheilung an den 

 Samoanischen Kusten nebst Vergleichenden Bemerkungen und ein An- 

 hang : Ueber den Palolowurm von A. Collin. Kiel and Leipzig. (See 

 also Biol. Centralbl., 1899.) 

 Lewis, I. F. 



'10 Periodicity in Dictyota at Naples. Bot. Gazette. 



