654 



Arten verdrängt oder ausgerottet worden sein. Wie stände es aber 

 dann mit den Funden in Schweden und Norwegen? - — Soll die My sis 

 in Schweden ein Relict darstellen und trotzdem so auffallend der 

 Madüform ähneln? — Soll sie aber auch in Schweden und Norwegen 

 und Nordfinnland eingewandert sein, wosich den Einwanderern Wasser- 

 fälle und stark fließende Gebirgsfiüsse entgegenstellen? — Es ist 

 schwer den richtigen Weg zu finden; wir meinen, diesen mit unseren 

 eingehenden Erörterungen gegangen zu sein und glauben, daß unser 

 Erklärungsversuch des Vorkommens der Mysis in der Madii auch für 

 die beiden andern Krebse Geltung hat. Denn weder für Pallasiella 

 noch für Ponioporeia können wir eine Einwanderung zur Jetztzeit in 

 den See annehmen, trotzdem Pontop. afßnis in der Ostsee verbreitet ist. 



Wir schließen unsere Ausführungen mit der Bemerkung, daß wir 

 das Vorkommen der in der Madü entdeckten drei Crustaceen noch in 

 gewissen anderen Seen Norddeutschlands für wahrscheinlich halten. 



Berlin, d. 18. Nov. 1900. 



II. Mittheilungen aus Museen, Instituten etc. 



1. Linnean Society of New South Wales. 



September 26th, 1900. — l) Botanical. — 2) On a new Genus and two 

 new Species of Australian Coccidae. By E. Ernest Green, F.E.S., Govern- 

 ment Entomologist of Ceylon. (Communicated by W. W. Froggatt, F.L.S.) 

 A species of Rhizococcus from Acacia decurrens at Mittagong, N.S.W., and 

 one of Antecerococcus (gen. nov.) from Pittosporum eugenioides, at Bathurst, 

 N.S.W., are described. — 3) 4) and 5) Botanical. — 6) Australian Land 

 Planarians: Descriptions of new Species, and Notes on collecting and pre- 

 serving. No. II. By Thos. Steel, F.L.S. , F.C.S. Three new species of 

 Geoplana from Western Australia are described, and the occurrence of a new 

 variety of G. quinquelineata , F. & H., is noted. These are of interest as 

 being the first land planarians recorded from this part of Australia. The 

 same new variety of G. quinquelineata is also recorded from South Australia, 

 and a description of it is given. Another Geoplana found in the vicinity of 

 Sydney is described as new. Detailed notes on the habits and some interest- 

 ing observations on the life-history of land planarians are given, particularly 

 as to the manner in which the large egg-capsule is deposited through a rup- 

 ture in the wall of the uterus and the tissues of the dorsal surface, the 

 opening subsequently quickly healing again. Finally, the author's methods 

 of collecting and preserving land planarians are described. — Mr. D. G. 

 Stead exhibited specimens of a ''land-crab" (Cardisoma sp.) from Tanna, 

 New Hebrides, known to the Tannese as "To-ba". Also the remains of four 

 fresh-water crayfishes (Astacopsis bicarinatus) taken from the stomach of a 

 Murray Cod {Oligorus macquariensis). He also called attention to the large 

 numbers of the "southern crayfish" (Palinurus Edwardsii) which have been 

 sold in Sydney lately, a few of which had been caught in Port Jackson. — 

 Mr. North exhibited the type of Eremiornis Carteri ì a new genus and species 



