158 PROCEEDINGS OF THE ACADEMY OF [May-Oct., 



posited in the Museum d' Histoire Naturelle, in order that zoologists 

 may assure themselves of the exactitude of his observations. 



However, none exists in the Museum at Nice, nor in the Museum 

 at Turin, and I believe it is certain that none is found either at 

 Genoa or Paris. The study of his species can therefore only be 

 undertaken in the private collection itself. 



In the following pages I have noted the conclusions which have 

 resulted fi-om my study of the specimens, and the differences of 

 opinion which I have with his previous eminent critics. The syn- 

 onymic study which I have undertaken before publishing the Fauna 

 of the Terrestrial and Fluviatile Mollusks of the Principality of Mon- 

 aco and of the Departement des Alpes-Maritimes, in 1910, relates 

 only to this part of the volume on Conchology. In the present 

 notes I review only the species mentioned by Risso, and in the order 

 in which they were placed by him. 



In taking up the slugs I can make but few notes because the speci- 

 mens, long since deprived of alcohol, are absolutely dessicated and 

 indeterminable. 



The numerals following the names are those of the original pagina- 

 tion in Risso's fourth volume. 



Arion lineatus Risso (55). Bourguignat asserts that this is the 

 Arion hortensis of Ferussac, since Risso's species differs only from 

 that of Ferussac by its lateral zones of a more orange tint. This is 

 not sufficient to establish their identity. PoUonera, in his Recense- 

 ment den Arions de la Region Palearctique, has retained Risso's 

 species, as that author specifies that his Arion had blackish eyes 

 and the foot of a dirty gray, and this color does not agree with that 

 of A. hortensis. It is probable, however, that Risso confused several 

 species under one name. 



LiMAX antiquorum (Fer.) Risso (55). Bourguignat states that 

 it is by an error that Risso said of this slug "clypes levi," because 

 the entoconch of this species is always concentrically striated. In 

 their monograph of Italian limaces M. M. Lessona and Pollonera 

 have demonstrated that this Limax antiquorum (pars) Ferussac^ is a 

 synonym of Limax maximus (pars) Moquin Tandon, and also a 

 synonym of Limax cellarius d'Argenville. Therefore Risso's species 

 should be called by this name. Under the name of antiquorum 

 Ferussac has moreover united in a single species all the large limaces, 

 cellarius, cinereo-niger, and their varieties. 



2 Hist. Moll. 1819, p. 4, figs. 2, 7 and 8. 



