J. W. Jenkinson 
209 
(41) Spemann, H. Entwickelungsphysiologische Studicii am Triton-Ei. Arch. Ent. Mech. 
XII, XV, XVI. 1901, 1903. 
(42) Vbjdovsky, F. Entwickelungsgaschiclitliche Untersuchuiigen. Prag, 1888-1892. 
(43) Wandolleck, B. Zur Embryonalentwicklung von Stro7igi/lus paradoxus. Arch. Natur- 
geschichte, LViii. 
(44) Whitman, C. 0. The embryology of Clepsine. Quart. Journ. Micr. Sci. xviii. 1878. 
(45) Wilson, E. B. Experiments on cleavage and localization in the Nemertine egg. Arch. 
Ent. Mech. xvi. 1903. 
(46) . Cleavage and mosaic work. Appendix to Crampton's paper on Ryanassa. Arch. 
Ent. Mech. iii. 1896. 
(47) . Experimental studies on germinal localization, i, ii. Journ. E.vp. Zool. i. 1904. 
(48) Wilson, E. B. and Matthews, A. P. Maturation, fertilization and polarity in the 
Echinoderm egg. Journ. Morph. x. 1895. 
(49) Zeleny, C. Experiments on the localization of developmental factors in the Nemertine 
egg. Journ. Exp. Zool. i. 1904. 
(50) ZiEGLER, H. E. Untersuchungen iiber die ersten Entwicklungsvorgange der Nematoden. 
Zeitschr. wiss. Zool. LX. 1895. 
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