(18) 



Neue Literntur. 



Hogben, L. T. and Huxley, T. S., 1922. Experiments on Amphibian meta- 

 morphosis and pigment responses in relation to internal secretions. 

 Proceed. Royal Society London B. 93. S. 136— 153. 



Hopkins, H. S., 1921. The conditions for conjugation in diverse races of 

 Paramecium. Journ. Exper. Zool. 34. S. 339 — 384. 



Huxley, J. S., 1921. Differences in viability in different types of regenerates 

 from dissociated sponges, with a note on the entry of somatic cells 

 by spermatozoa. Biological Bulletin. 40. S. 127 — 129. 



Jordan, D.S., 1921. Latitude and vertebrae. Science. N. S. 54. S. 490— 491. 



Moore, C. R., 1921. On the physiological properties of the gonads as con- 

 trollers of somatic and psychical characteristics. IV. Gonad transplantation 

 in the guinea pig. Journ. Exper. Zool. 33. S. :)65— 389. 4 Textf. 



Moser, F., 1921. Ursprung und Verwandtschaftsbeziehungen der Siphono- 

 phoren. Versuch einer Urmedusentheörie. Sitzungsber. Preuß. Akad. 

 Wiss. Berlin. S. (311—615. 



Moser, F., 1921. Ursprung und Verwandtschaftsbeziehungen der Siphono- 

 phoren: Versuch einer Urmedusentheörie. Zool. Anz. 53. S. 97 — 100. 



Moser, F., 1921. Die phylogenetische Entwicklung der Siphonophoren in 

 neuer Darstellung. Zool. Anz. 53. S. 100 -102. 



Newman, H. H., 1921. On the occurrence of paired raadreporic pores and 

 pore canals in the advanced bipennaria larvae of Asterina (Patiria) 

 miniata together with a discussion of significance of similar structures 

 in other Echinoderm larvae. Biological Bulletin. 40. S. 118 125. 

 3 Textf. 



NeAvman, H. H., 1921. The experimental production of twins and double 

 monsters in the larvae of the starfish Patiria miniata together with a 

 discussion of the causes of twinning in general. Journ. Exper. Zool. 

 33. S. 321—352. 46 Textf. 



Ohshinia, H., 1921. Inhibitory effect of dermal secretion of the sea-urchin 

 upon the fertilizability of the egg. Science. N. S. 54. S. 578 — ^580. 



Pearl, R. and Sclioppe, W. J., 1921. Studies on the physiology of repro- 

 duction in the domestic fowl. XVIII. Further observations on the 

 anatomical basis of fecundity. Journ. Exper. Zool. 34. S. 101-118. 

 2 Textf. 



Richards, A. and Thompson, J. T., 1921. The migration of the primary 

 sex-cells of Fundulus heteroclitus. Biological Bulletin. 40. S. 325 — 348. 



Stockard, ('. R., 1921. A probable explanation of solyembryony in the 

 armadillo. Am. Naturalist. 55. S. 62 — (58. 



Wilier, B. H., 1921. Structures and homologies of freemartin gonads. Journ. 

 Exper. Zool. 33. S. 63—127. 18 Textf. 



c) Menscli. 



Brouian, J., 1920. Über rudimentäre Hautorgane beim menschlichen Embryo 

 und über die Phylogenese von Milchdrüsen und Tasthaaren. Anat. 

 Anz. Ergänz.-Bd. 53. S. 27—38. 10 Textf. 



Daufortli, ('. H., 1919. Resemblance and difference in twins. Journ. of 

 Heredity. 10. S. 398—409. 7 Textf. 



