140 3. Die höheren Lebenseinheiten. 



369) Kiliau, Das Neueste vom Eichhörnchen. 



(Aus der Heimat 23,1. p. 29— 39. 1910.) 

 Es wurde beobachtet, wie auf einer von Tortrix viridana völlig zerfres- 

 senen Eiche ein Eichhörnchen saß, das eifrig die einzelnen Ästchen durch das Maul 

 zog, und die daran sitzenden Raupen des Eichenwicklers verzehrte. 



P. Schulze (Berlin). 



370) Colton, H. $., The „Pyloric Gland" of the Ascidian Botryllus. 

 An Organ of Excretion? 



(Biological Bulletin 19,1. p. 35—54. 2 figures in text. 2 plates. June 1910.) 



The author's summary on pages 48 and 49 follows: 



„1. There are in Botryllus two sorts of terminations to the tubes that 

 compose the pyloric gland, bladder-like ampullae and long straight blind 

 tubes — the latter we have called rectal tubules because in many cases they 

 extend to the region of the rectum. 



2. The ducts and ampullae of Botryllus as well as Ascidia, Styela, 

 Molgula, Perophora, Clavelina and Amaroecium are lined by cells 

 bearing long whip-like flagella, the ends of which are directed toward the 

 mouth of the duct. 



3. Many of the rectal tubules have a termination difficult to interpret. 

 This has the appearance in most cases of a cup-like depression in the end 

 of the tube which seems to form a communication between the blood cavity 

 and the lumen of the tube. In no case, however, could such a communication 

 be demonstrated. 



4. The direction in which the free ends of the flagella point indicates 

 that the Contents of the lumen pass toward the stomach and therefore the 

 function of the organ is secretory rather than that of absorption. 



5. Part of this secretion is probably found in the minute yellow globules 

 found in the cells of the ducts and ampullae. If these yellow globules re- 

 present a secretion, this is soluble in water and does not form masses in the 

 lumen of the tube as in Microcosmus and Styela. 



6. Bismarck brown and neutral red are concentrated in the lumen of 

 the organ in the form of a liquid while the indigo carmin is found concen- 

 trated in solid form in the gland of Styela. 



7. In the tunicates in general no special kidney of excretion has been 

 recognized. Although the gland in question may have other functions also, 

 yet its structure and properties seem to indicate that it is the kidney of ex- 

 cretion of the tunicates, and is in turn homologous to the vertebrate liver." 



Lillie (Chicago). 



371) Alezais et Peyron (Faculte de Med. Marseille), Sur la presence 

 de globules rouges nuclees dans les vaisseaux sanguins de l'hypo- 



1) ll V S G 



(Compt. Rend. Soc. de Biologie 69,27. p. 204—206. 1910.) 

 Le lobe gland ulaire de l'hypophyse chez l'homme, a l'etat normal et dans 

 les tumeurs est gcneralement caracterise par l'absence d'une delimitation nette 

 entre les elements epitheliaux des cordons et les cavitcs vasculaires. Quelques 

 elements observes au voisinage des parois endotheliales presentent avec les 

 erythroblastes une grande analogie. Ces parois, surtout dans la region du 

 manteau, sont en partie constituees par des cellulcs principales ou chromo- 

 phobes grands, moyens et petits; on trouve en certains points des groupes de 

 petits chromophobes en bordure d'un capillaire endothelial, et la paroi vas- 

 culaire peut-etre absente ou incomplcte ä leur niveau. Le noyau de ces ele- 

 ments est net, condense, le protoplasma en est incolore, tout ;i fait homogene. 



