296 



two funnel-shaped receptacles of one litre capacity each may be secured and 

 made to revolve vv^ith the shaft. The main portion of each of these receptacles 

 is constructed of spun copper, tinned. When caused to revolve for one or 

 two minutes the entire contents of suspended matter in the contained water 

 is thrown to the bottom of tubes properly placed from which the amount 

 may be read off by means of a graduated scale. 



May 19th, 1896. — The collections made by Dr. A. Donaldson 

 Smith in Western Somali Land and the Galla Country, north-eastern 

 Africa, in 1894 were presented to the Academy. Dr. Smith spoke of the 

 physical features of the region from which the specimens had been collected 

 and gave briefly some facts regarding the habits of the animals observed by 

 him. The several sections of the collection were commented on by the 

 specialists of the Academy. The mammals are of unusual interest because 

 these alone have not been studied by authorities elsewhere. They embrace 

 fifty genera and about seventy species represented by over two hundred spe- 

 cimens. Seven genera and twelve species are new to American museums. 

 The collection, except the bats, which are being studied by Dr. Harrison 

 Allen, is in the hands of Mr. Samuel N. Rhoads who will furnish a detailed 

 report on the material submitted to him. The birds have been studied by 

 Mr. Bowdler Sharpe. One hundred and fifty specimens of about one hundred 

 species have been given to the Academy. The insects embrace 871 spe- 

 cimens. The Hymenoptera are being studied by Mr. Wm. J. Fox who has 

 determined eight species hitherto undescribed. A paper entitled. »The 

 Planktonokrit, a centrifugal apparatus for the volumetrie estimation of the 

 food supply of oysters and other aquatic animals", by Chas. S. DoUey M.D. 

 was presented for publication. 



3. Die Biologische Station zu Plön 



bleibt wegen Renovation sämmtlicher Räumlichkeiten während der 

 ganzen Dauer des Monats Juli für alle Besucher geschlossen. Vom 

 5. August ab können wissenschaftliche Arbeiten dort wieder vorge- 

 nommen werden. Herr Dr. Otto Zach ari as ersucht uns, mitzuthei- 

 len: daß die Zeit vom 1. August bis Mitte September sich besonders 

 gut zu Studien am Plankton des Großen Plöner Sees eigne, weil dann 

 die limnetischen Algen, Protozoen, Räderthiere und Krebse in beson- 

 derer Massenhaftigkeit vorhanden zu sein pflegen. — Die für einen 

 Arbeitsplatz pro Woche zu erlegende Gebühr beträgt 10 Mark. 



4. Avis. 



F. Geay, 89 rue Broca à Paris, se propose de partir en automne 

 pour les régions inexplorées de la Guyane où il se propose de séjourner 

 deux ans ; il prie les zoologistes de lui faire connaître quels animaux 

 pourraient les intéresser spécialement. 



5. Demande. 



On demande, pour l'expédition antarctique Belge, un Zoologiste 

 expérimente en matière de draguages en eau profonde. 

 Adresser les offres et demandes de renseignements à M. de Ger- 

 lache, chef de l'expédition, à Sandefiord, Norwège. 



de Gerlache. 



Druck von Breitkopf & H&rtel in Leipzig. 



