210 BULLETIN: MUSEUM OF COMPARATIVE ZOOLOGY. 
Hamann, O. 
1883. Beitrage zur Kenntniss der Medusen. Zeitschr. f. wiss. Zool., 
Bd. 38, pp. 419-429. Taf. 23. 
Hargitt, C. W. 
1900. A Contribution to the Natural History and Development of 
Pennaria tiarella. Amer. Nat., Vol. 34, pp. 387-414, Pl. 1-4. 
Hargitt, C. W. ; 
1904*°. Notes on Some Hydromedusae from the Bay of Naples. Mit- 
theil. Zool. Stat. Neapel, Bd. 16, pp. 553-585, Pl. 21-22. 
Hargitt, C. W. 
19046, The Early Development of Eudendrium. Zool. Jahrb., Abth. 
f. Anat., Bd. 20, pp. 257-276, Taf. 14-16. 
Hargitt, C. W. 
1904°. The Early Development of Pennaria tiarella McCr. Arch. f. 
Ent.-Mech. Organ., Bd. 18, pp. 453-488, Taf. 24-28. 
Hargitt, C. W. 
1906. The Organization and Early Development of the Egg of Clava 
leptostyla Ag. Biol. Bull., Vol. 10, pp. 207-232, Pl. 9, 18 Fig. 
Hargitt, G. T. 
1909. Maturation, Fertilization and Cleavage of Pennaria tiarella and 
Tubularia crocea. Science, Vol. 29, p. 427. 
Harm, K. 
1902. Die Entwicklungsgeschichte von Clava squamata. Zeitschr. f. 
wiss. Zool., Bd. 73, pp. 115-165, Taf. 7-9. 
Heine, L. 
1895-6. Die Mikrochemie der Mitose, zugleich eine Kritik mikrochemis- 
cher Methoden. Zeitschr. f. physiol. Chem., Bd. 21, pp. 494-506. 
Hertwig, R. 
1898. Uber Kerntheilung, Richtungskérperbildung und Befruchtung 
von Actinosphaerium eichhorni. Abhandl. k. bayer. Akad. Wiss., 
Cl. II, Bd. 19, Abth. III, pp. 633-734, Taf. 1-8. 
Hertwig, R. 
1908. Uber neue Probleme der Zellenlehre. Arch. f. Zellforsch., Bd. 1, 
pp. 1-82. 
Hickson, 8. J. 
1888. On the Sexual Cells and the Early Stages in the Development of 
Millepora plicata. Phil. Trans. Roy. Soc. London, Vol. 179, B, pp. 
193-204, Pl. 38-39. 
Hickson, §. J. 
1890. On the Maturation of the Ovum and the Early Stages in the 
Development of Allopora. Quart. Jour. Micr. Sci., Vol. 30, pp. 579-598, 
Pl. 38. 
Hickson, 8. J. 
1894. The Early Stages in the Development of Distichopora violacea, 
with a Short Essay on the Fragmentation of the Nucleus. Quart. 
Jour. Micr. Sci., Vol. 35, pp. 129-158, PI. 9. 
