267 



Ils se sont modifiés d'une façon corrélative; et la manière d'être qu'ils 

 ont acquise ainsi offre une telle netteté qu'ils composent actuellement 

 une espèce nouvelle, aussi bien caractérisée que les autres espèces, 

 plus anciennes, du genre Atherina. 



A. Riqueti montre donc le cas curieux et intéressant d'une espèce 

 de création récente, faite par l'adaption aux eaux douces d'un être 

 marin. Je lui ai donné son nom en souvenir de Riquet, l'ingénieur 

 qui a conçu et creusé le Canal, et qui permit ainsi à cette espèce de 

 prendre naissance. 



Je n'insiste pas d'avantage sur un pareil sujet. Je me réserve de 

 revenir plus tard sur lui, et de préciser plusieurs questions connexes. 

 Je me borne à signaler l'existence de cette espèce, et à montrer l'im- 

 portance, dans la discussion des problèmes de la biologie générale, des 

 faits spéciaux étudiés à fond. 



IL Mittheilungen aus Museen, Instituten etc. 



1. Zoological Society of London. 



February 18th, 1902. — Mr. L. W. Byrne, F.Z.S., pointed out that 

 ihe supposed new Sucker-fish which had been described by Mr. E. W. L. 

 Holt and himself before the Society on November 15th, 1898, as Lejiado- 

 gaster stictopteryx^ was, in reality, not a new species, but was identical with 

 L. microcephalus Brook. — Mr. W. B. Tegetmeier, F.Z.S., exhibited and 

 made remarks upon the skull of a supposed hybrid between the Sheep and 

 the Pig, named ''Cuino" by the inhabitants of Mexico, where it is stated to 

 be extensively reared as an agricultural animal. The skull was clearly that 

 of a Pig. — Dr. C. I. Forsyth Major, F.Z.S., exhibited and made remarks 

 upon some remains of Voles from the Upper Val d'Arno (Italy) and from 

 the Norwich Crag, representing Microtus pliocaenicus (Maj.) and Microtus 

 intermcdius (Newt.) Dr. Forsyth Major considered that they belonged to a 

 distinct genus, which he proposed to name Mimomys, — Mr. R. Lydekker 

 exhibited, on behalf of Mr. Rowland Ward, two pairs of antlers and a skull 

 of an Elk from Siberia (beyond the Altai). Mr. Lydekker pointed out that, 

 although belonging to adult animals (as the dentition of the skull indicated) 

 the antlers had practically no palmation — a characteristic which induced him 

 to propose the specific name Alces Bedfordiae for the Siberian Elk. — Dr. 

 C. I. Forsyth Major, F.Z.S., gave a description of Mustela palaeattica^ 

 Weith., from the upper Miocene of Pikermi and Samos, based, chiefly on an 

 almost perfect skull from Pikermi in the Turin Museum. Dr. Forsyth Major 

 insisted upon the Musteline characters of the skull and teeth of the fossil 

 species, which, on the strength of Weithofer's description, had been 

 placed in the genus Meles by Schlosser, and in a new genus (Promeles) of the 

 Melinae by Von Zittel. — Mr. Oldfield Thomas, F.R.S., read a description 

 of two new rodents discovered by Mr. P. O. Simons near Potosi, Bolivia. 

 The one proposed to be called Neoctodon Simonsi was allied to Octodon^ but 

 had simpler teeth, without enamel infoldings, and a bushy tail, the size and 

 external appearance being much those of Neotoma cineì-ea. The second, called 



