422 5. Entwicklungslehre. 



Milialcovics (le futur rete ovarii ou testis), en rapport avec les cordons 

 de premiere proliferation de repithelium germinatif (cordons medullaires 

 ou tubuli conto rti), forme l'cpoophoron ou l'epididyme; la partie poste- 

 rieure devient le paroophoron ou le paradidyme. 



v. Winiwarter donne egalement quelques details sur la formatioa du 

 canal de Müller, auquel il attribue un developpement plus precoce que ses 

 devanciers dans l'etude de cet organe chez l'homme. 11 Signale egalement une 

 serie d'anomalies de l'cpoophoron, du rete, du paroophoron et du canal de 

 Wolff, notamment des dilatations kystiques, et croit, avec Winiwarter et 

 Sainmont (1909), que les kystes ovariques ont le plus souvent pour origine, 

 non pas les follicules, mais le rete, peut-etre aussi parfois l'cpoophoron. 



J. Duesberg (Liege). 



847) Pearson, K. (University College London), On the Effect of a Diffe- 

 rential Fertility on Degeneracy. 



(Biometrika 7,3. p. 258—275. 1910.) 

 The author points out that a correlation between fertility and any cka- 

 racter, giving rise to ,genetic selection' may prevent or reverse natural selec- 

 tion. The greater part of the paper is mathematical. Examples are given showing 

 that the known correlation in civilised man at the present time between ferti- 

 lity and inferior ability must rapidly lower the average ability of the race, 

 and may in one generation halve the number of noteworthy men produced, if 

 one in one thousand are considered as , noteworthy' in the first generation. 

 He emphasises the urgent need for the collection of further data as to size of 

 f amilies in various sections of the population. Doncaster (Cambridge). 



848) Chinaglia, L., Coleotteri con anomalie di struttura. 

 (Rivista Coleotterologica Italiana 8,1—3. p. 1—8, 25—39. 1 Taf. mit 22 Fig. 1910.) 



Verf. beschreibt einige 30 Fälle von Mißbildungen an Käfern der ver- 

 schiedensten Arten und bildet 22 davon ab. Ein ausführliches Literaturver- 

 zeichnis über den behandelten Gegenstand sowie die Tafelerklärung finden 

 sich durch ein Versehen des Druckers erst auf S. 56 —60. 



Schulze (Berlin). 



849) Cole, L. J. (University of Wisconsin), Description of an Abnor- 

 mal Lobster Cheliped. 



(Biological Bulletin 18,5. p. 252—268. 1910.) 



Summary (Quoted). 



„In this paper is described the abnormal cheliped of a lobster (Homa- 

 rus americanus), the abnormality consisting of a double extra claw. While 

 the extra part actually separates from the normal propodus, it is shown that 

 the effects of the doubling may be traced to the base of the leg. It is further 

 shown that the conditions in this appendage illustrate almost diagrammatically 

 the „rules of secondary symmetry" formulated by Bateson; if allowance be 

 made for the effects of the torsion which occurs in the normal lobster cheli- 

 ped and the mechanical conditions which may modify such torsion." 



F. Lillie (Chicago). 



850) Widakowicll, V. (Morph.-physiol. Ges., Wien), Beschreibung des 

 Modelles einer Doppelbildung der Ratte im Stadium des Primitiv- 



streif pns 



(Zentralbl. f. Physiol. 24,7. p. 305. 1910.) 

 Aus den Befunden scheint hervorzugehen, daß es sich nicht um zwei aus 

 einem Ei hervorgegangene Gebilde, sondern um zwei an den verdickten Polen 



