§30 5. Entwicklungslehre. 



deren Erfolg hei frisch befallenen und schon seit mehreren Jahren erkrankten 

 Bäumen. Der Abhandlung sind außer 7 Textfiguren 2 Tafeln beigegeben, 

 auf denen von der Mistel sehr stark befallene Bäume abgebildet sind. 



H. Hoff mann (Berlin). 



1795) Boulenger, C. L. (üniversity of Birmingham), On the Origin 

 of the stinging-cells in Craspedote Medusae. 



(Quart. Journ. Micr. Science 55,4. p. 763— 7S3. 2 plates. 1910.) 

 The stinging-cells Moerisia lyonsi are not formed in the batteries 

 where they are found. Those of the battery on the oral lip are formed in 

 the endoderm of the manubrium, just below the stomach; those of the tentacles 

 in the ectoderm of the ocellar bulbs. The bulbous swellings at the bases of 

 the tentacles in other Craspedote medusae probably have a similar function, 

 and in the Trachymedusae and Narcomedusae the stinging cells appear to arise 

 in the thickened rim. 



The gonophores of Moerisia are developed in the manner described by 

 Götte; there is no double-walled endodermal cup but the radial canals and 

 endoderm lamella arise from endodermal ponches. The stinging-cells, like the 

 sex-cells, are developed from cells derived directly or indirectly from the 

 ectoderm of the parent bydranth. Doncaster (Cambridge). 



1796) Girault, A. A. (üniversity of Illinois), Preliminary studies on 

 the Biology of the Bed-bug Cimex lectularius. 



(Journ. Economic Biology 5,3. p. 83—91. 1910.) 

 Experiments in feeding this parasite with human blood (byallowing it 

 to suck blood from the arm), showed that if the animal from the early stages 

 is never allowed to fill itself to repletion, it develops more slowly than the 

 normal, with an increased number of ecdyses. One füll feed in each Stadium 

 is sufficient for normal development. Underfed individuals, when they reached 

 maturity, were fed to repletion and they then mated, and reproduced. The 

 underfeeding did not affect sex. The male feeds, but is less strongly stimu- 

 lated by the proximity of foöd than the female. Doncaster (Cambridge). 



1797) Perez, Charles, Becherches histologiques sur la metamorphose 

 des Museides (Calliphora erythroeephala Mg.). 



(Archives de Zoologie experim. et generale; 5 serie, 4, p. 1—274, PI. I ä XVI, 



1910). 



Dans ce tres important memoire, l'auteur s'est attache ä rechercher le 

 Processus des transformations nymphales des organes des Museides, en laissant 

 de cöte, toutefois, tout ce qui a rapport au Systeme nerveux et au cceur. 



Pour le tube digestif l'auteur arrive ä cette conclusions que les pheno- 

 menes se ramenent absolument aux lois de la mue: tout peut s'interp reter 

 comme la superposition de deux mues simultanees, suivies d'une differenciation 

 qui conduit ä la Constitution de l'organe definitif. 



Perez demontre que la clestruction de certains muscles somatiques est 

 bien due ä une phagocytose leueocytaire dans toute l'acception du terme con- 

 trairement aux affirmations de B er lese. 



Si Ton compare les organes qui de la larve persistent chez l'adulte et ceux 

 qui disparaissent, on constate que ce «qui disparait totalement, ce sont les 

 parties les plus strictement spccialisees de la larve». Ce qui s'edifie totale- 

 ment ä nouveau, ce sont les parties les plus specialisces de l'imago. Ainsi, 

 pour ne citer qu'un exemple: les muscles les plus speciaux ä l'Asticot dis- 

 paraissent entierement par Phagocytose; les muscles les plus speciaux ä la 



