404 SYDNEY J. HICKSON. 



Bibliography. 



1. F. M. Balfour.—' Comparative Embryology,' 1880. 



2. R. BoHM. — " Helgolaiider Leptomedusae," * Jen. Zeits.,' xii, 1878. 



3. W. K. Brooks. — " The Life History of the Hydromedusse :" a discussion 



of the origin of Medusae and the significance of Metagenesis, ' Mem. 

 Bost. Soc. Nat. Hist.,' vol. iii, No. 12, 1886. 



4. Glaus. — " Ueber Halistemma tergestinum," &c., ' Arbeiten des Zool. 



Tnstit. zu Wien,' tom. i, 1878. 



5. C. Claus. — " Zur Beurtheilung des Organismus der Siphonophoren und 



deren phylogenetischer Ableitung," 'Arbeiten Zool. Instit. zu Wien, 

 viii, Heft 2, p. 159; translated in the 'Annals and Magazine of 

 Natural History,' vi, 21, pp. 185—198. 



6. S. J. HiCKSON. — " The Sexual Cells and the Early Stages in the Develop- 



ment of Millepora plicata," 'Phil. Trans.,' vol. clxxix, 1888, B., 

 pp. 193—204. 



7. S. J. HiCKSON. — " On the Maturation of the Ovum and the Early Stages 



in the Development of AUopora," ' Quart. Journ. Micr. Sci.,' vol. xxix, 

 p. 579. 



8. W. H. Jackson. — ' Rolleston's Forms of Animal Life,' 2nd edition, 



1888. 



9. E. Kay Lankester. — Article " Hydrozoa," 'Encyclopaedia Britann.,' 



9th edition. 



10. H. N. MosELEY. — " Report on Certain Hydroid, Alcyonarian, and Madre- 



porarian Corals," '"Challenger" Reports,' vol. ii, 1881. 



11. J. J. QuELCH. — "On the Presence of Ampullae in Millepora murrayi," 



' Nature,' vol. xxx, 1884, p. 539 ; and in ' " Challenger " Reports,' 

 vol. xvi, " Reef Corals." 



12. A. Weismann. — ' Die Entsteliung der Sexualzellcn bei den Hydro- 



medusen,' Jena, 1883. 



