394 K. T. GUNTHER. 



1900. DoNCASTEii, L.— " Cliselognaiha," ' Fauna Maldive and Laccadive 



Arcliipelagoes,' i, p. 209. 

 1900, Steiniiaus, 0.— "Cliaetognathen," ' Hamb. Magelhaens Sammelreise,' 



V. 



1902. Hesse, R.— '• Untersuchungen uber die Organe der Lichtempfindung 



bei niedere Thieren ; viii, B, Die Seliorgane von Spadella hexa- 

 pt.era," ' Zeitsehr. wiss. Zool.,' Ixxii, p. 572. 



1903. DoNCASTEK, L.— " On tlie Development of Sagitia; with Notes on the 



Anatomy of the Adult," 'Quart. Journ. Micr. Sci.,' vol. 46, 1903. 

 1903. GiJNTiiER, K. T. — "On the Distribution of Mid-water Chaetogiiatha 



in the N.Atlantic during the Month of November," 'Ann. Mag. 



Nat. Hist.,' ser. 7, xii, pp. 334-7. 

 1903. Krumbacii, T. — "Die Greifhaken der Chsetognathen," 'Zool. Jahrb.,' 



xviii, p. 579. 

 1905. Fowler, G. H. — "Biscayan Plankton collected during a cruise of 



H.M.S. 'Research,' 1900," 'Trans. Linn. Soc.,' x, pp. 55-87, 



pis. 4—7. 

 1905. Stkodtmann, S. — "Die Chaetognathen," 'Nordisches Plankton,' iii, 



X, pp. 10—17, Kiel. 



Addendum to Page 380. 



Conant states tliat there is no longitudinal partition be- 

 tween tlie spermatic chambers in Spadella schizoptera, 

 and that the right and left oviducts are in communication 

 with one another by branches which meet and form a small 

 blind tubule lying" on the mid-ventral line beneath the intes- 

 tine. This union is believed to be a means for helping a 

 single copulation, affecting one side only, to fertilise the ova 

 of both sides of the body. (May, 1907.) 



