152 



gestion of particles by the infusorians. The matter taken up thus from the 

 funnel by the first cell is carried by the rest and so on till the cells having 

 a lumen are reached. The presence of the excretum causes the granules to 

 stimulate the muscular fibres of the cells, peristalsis results and the sub- 

 stance is carried outwards. The character of this contractile reticulum offers 

 an explanation of the structure of a cilium as being the continuation of a 

 contractile reticular thread. — N. R. Harrington in »Observations on the 

 lime gland of the Earthworm« described the minute structure of these glands 

 in L. terrestris , and showed that the lime is taken up from the blood by 

 wandering connective tissue cells which form club shaped projections on the 

 lamellae of the gland, and which pass off when filled with lime. The new 

 cell comes up from the base of the older cell and repeats the process. This 

 explanation is in harmony with the fact that in all other invertebrates lime 

 is laid down by connective tissue cells. Histological structure and the deve- 

 lopmental history confirm it. — Dr. Kashford Dean, ofi"ered some observa- 

 tions on »Instinct in some of the lower Vertebrates. (f The young of ^m/« calva, 

 the dogfish of the Western States, attach themselves, when newly hatched to 

 the water plants at the bottom of the nest which the male Amia has built. 

 They remain thus attached until the yolk sac is absorbed. As soon as they 

 are fitted to get food they flock together in a dense cluster following the 

 male. When hatched in an aquarium they go through the same processes. 

 The young fry take food particles only when the particles are in motion, 

 never when they are still. The larvae of Necturus also take food particles 

 that are in motion. C. L. Bristol, Secretary. 



3. Deutsche Zoologische Gesellschaft. 



Jahresversammlung in Bonn 

 vom 28.— 30. Mai. 



Vorträge haben ferner angemeldet die Herren 



Prof. F. Bio eh mann (Rostock): Die Epithelfrage bei Cestoden 

 und Trematoden (mit Dem.). 



Prof O. Bütschli (Heidelberg): Über den Bau der quellbaren 

 Körper und die Quellung. 



Dr. F. Schaudinn (Berlin): Über das Centralkorn derHeliozoen, 

 ein Beitrag zur Centrosomenfrage. 



Dr. P. Samassa (Heidelberg): Über die äußeren Entwicklungs- 

 bedingungen der Eier von Rana temporaria. 



Dr. 11. v. Erlanger (Heidelberg): Über die Befruchtung und 

 ersten Theilungen des Eies von Ascaris megalocephala. nebst allge- 

 meinen Betrachtungen über den Bau des Protoplasmas, der Spindel 

 und des Centrosomas (mit Dem.). 



Prof V. Hacker (Freiburg i. Br.): Einige Berührungspuncte der 

 Entwicklungsmechanik und Zellenlehre. 



Demonstrationen haben angemeldet die Herren 



Dr. Samassa Heidelberg): Über die Keimblätterbildung bei 

 Wirbeltliieren. 



Dr. F. Schaudinn (Berlin): Copulationsstadien von Aetinoplirys 

 sol Ehrbg. 



Druck von Breitkopf' & Härtel in Leipzig. 



