498 . 



leurs sources les bassins des fleuves d'Europe peuvent très facilement 

 passer du bassin d'un fleuve à marée dans celui d'un cours deau sans 

 marée, ou sans communication directe avec la mer. D'ailleurs il 

 existe pour les besoins du commerce de grands canaux qui unissent 

 certains fleuves comme p. ex. celui du Rhône au Rhin et d'autres 

 encore. Par ces voies là la transmission est encore plus facile et pour- 

 rait même se faire tout simplement par le moyen des navires qui re- 

 montent les dits cours d'eau. Ainsi donc les Némertiens fluviatiles 

 provenant directement ou indirectement de la mer nous pouvons résu- 

 mer toute cette notice en disant que soit qu elle les apporte, soit qu'elle 

 les délaisse en se retirant, la mer est l'unique agent qui importe ces 

 animaux dans les eaux douces où nous les trouvons actuellement. 

 Anières près de Genève le 10 Octobre 1895. 



II. Mittheilungen aus Museen, Instituten etc. 



1. Zoological Society of London. 



3rd December, 1895. — The Secretary read a report on the addi- 

 tions that had been made to the Society's Menagerie during the months of 

 October and November 1895, and called attention to the acquisition of a 

 specimen of the Wild Goat of the island of Giura, in the Aegean Sea [Ca- 

 pra dorcas). — Mr. Tegetmeier exhibited a specimen of a Crab with 

 a supernumerary claw. — A communication was read from Dr. G. Steward- 

 son Brady, F.R.S. , containing a supplementary report on the Crustaceans 

 of the group Myodocopa obtained during the »Challenger« Expedition, to 

 which were added notes on other new or imperfectly known species of this 

 group. — Mr. F.E. Beddard, F.R.S., F.Z.S., read papers on some points 

 in the anatomy of IHpa americana and on the diaphragm and the muscular 

 anatomy of Xenopus. The author added remarks on the affinities of these 

 two anomalous Batrachians , which he considered to have been correctly 

 placed together in the System. — Mr. W. Bateson, F.R.S. , gave an account 

 of the colour -variations of a variable Beetle of the family Chrysomelidae 

 [Gonioctena variabilis) statistically examined. It was shown that the indivi- 

 duals are chiefly either red spotted with black, or else greenish grey striped 

 with black. All intermediates occurred, but were less common than the 

 type-varieties. These facts illustrated the phenomenon of Organic Stability. 

 — A communication from Mr. R. Lydekker, F.R.S., F.Z.S. , contained 

 remarks on the affinities of the so-called extinct Giant Dormouse of Malta.' 

 The author stated that this extinct Rodent did not belong to the Myoxidae, 

 but rather to the Sciuridae, unless it were necessary to assign it to a family 

 apart. He proposed for its reception the new generic term Leithia. — A 

 communication was read from Mr. W. E. Jennings Bramley giving an 

 account of the mode of capturing Loder's Gazelle [Gazclla loderi) . used by 

 the Arabs of the Western Desert of Egypt. — Mr. G. A. Boule nger gave 

 descriptions of a new Snake [Typhlops nigricauda] and of a new Frog [Chiro- 

 leptes Dahlii) from Northern Australia. — A second paper by Mr. Boulen- 

 gêr contained an account of the type-specimen of Boulengerina Stornisi — 

 an Elapoid Snake from Lake Tanganyika, recently described by M. Dolio. 

 — P. L. S dater, Secretary. 



