424 
M HERLANT 
Tennent (D. H.). — Studies in Cytology. ï. A further study of the chromo¬ 
somes of Toxopneustes variegatus. II. The behavior of the chromosomes 
in Arbacia-Toxopneustes crosses. Journ. of exper. zool., vol. 42, 1912. 
Wassilieff (A.). — Uber künstliche Parthenogenesis des Seeigeleies. Biol. 
Centralbl., Bd. 22, 1902. 
Wilson (E. B.). — Experimental studies in Cytology. I. A cytological study 
ol artificial parthenogenesis in Sea Urchin eggs. Archf. Entw. Mech., 
Bd. 12, 1901. 
— Experimental studies etc. II. Some phenomena of fertilization and cell 
division in elherised eggs Ibid., t. 13,1901, 
— Cytasters and centrosomes in artifîcial parthenogenesis. Zool. Anz.,Y$à. 
28,1905. 
Ziegler (H. E.). - Einige Bcobachtungen zur Entwicklungsgeschichte der 
Echinodermen. Verh. d. deutsch. zool. Ges ., 1890. 
— Experimentelle Studien liber die Zellteilung. II. Furchung ohne chromo- 
somen.^rcA. f. Entw. Mech., Bd. 0,1898. 
