fi6 Miscellaneous. 



when compared with the Norwegian lakes. But then Holopedium 

 (/ibberum of Lake Guery lives in a shallow pool of water ! This 

 lake is, in fact, of less extent than Lake Pavin and hardly 8 metres 

 in depth. 



With creatures of the size here in question the mass of water in 

 Lake Pavin and much more considerable masses will hardly prove to 

 he very different in their action. 



Two principal conclusions may be drawn from the facts hitherto 

 ascertained : — 



1. The peopling of the lakes of the region of the Mont Dore 

 appears to have been effected by passive migrations. 



2. The pelagic fauna of these lakes is constituted in a general 

 way like those of the rest of Europe, and presents common points 

 and points of divergence when compared with these different faunas. 

 — Comptes Rendus, Nov. 14, 1887, p. 951; Dec. 12, 1887, p. 1186. 



The Fauna of the Podophthahnous Crustacea of the Bay of Marseilles. 

 By M. Paul Gourket. 



The author states that the number of Podophthalmous Crustacea 

 observed by him, of which he proposes to publish a revision, amounts 

 to 124 species or varieties, 11 of which are new. These are : — 



Pinnotheres Marioni, Qalathea Parroceli *, Crangon Lacazei *, 

 Gnathophyllum elegans, var. hrevirostris *, Alpheus Oahrieli *, Hippo- 

 li/te Marioni *, Pontonia vagans, Callianassa stihterranea, var. 

 minor *, Siriella intermedia, Leptomysis Marioni, and Nehalia hipes, 

 var. elongata. 



The fauna greatly resembles that of the Adriatic — 90 species are 

 common to both. There is almost as close a similarity to the faunas 

 of Naples, Nice, and Algeria, the number of common species oscil- 

 lating between 82 and 66. The difference is much greater from 

 the Spanish carcinological fauna (Balearic Islands and Madeira), 

 which seems to include only 34 of the species obtained at Mar- 

 seilles. This difference may be due to our imperfect knowledge of 

 the Spanish fauna. 



The following species obtained at Marseilles do not occur in any 

 of the principal Mediterranean stations : — 



Plagusia chabrus, Pachygrapsus transversus, Ebalia nux, Eupa- 

 gurus Bernhardus and Icevis, Axius stirhynchus, Oebia deltura, 

 Munida teiaiimana, Oalathodes Marionis, and Crangon trispinosus. 



Of these species, however, the first two are imported into Mar- 

 seilles by ships from the Pacific, whilst Ebalia nux, Eapagurus 

 Icevis, Munida tenuimana, and Galathodes Marionis are species 

 dredged from great depths. Tbe four remaining species present a 

 curious distributional fact, although Gebia deltura has been taken 



* These forms were briefly described in a paper communicated by the 

 author to the Academy on November 21, 1887. 



