54 THE NAUTILUS. 



As indeed was done by Dr. Jousseaume. But Linnedid not specify 

 types in his genera, and there are good reasons for believing that he 

 did not regard the first mentioned species specially as the type. 

 Accordingly, Ferusac having next proposed Arion for another 

 division oi Limax L., we may adopt his name, and the residue (leav- 

 ing out Eolis, the true affinities of which had been recognized mean- 

 while) namely Agriolimax of modern authors, remains as Limax L. 

 Thus we get : 



Limax L. = Agriolimax 3Idrch. 



Avion Fer. 



Limacella Brard = Limax Auctt. 

 I do not adopt this arrangement, because I do not consider that 

 we can recognize Brard's name, but this is the logical result if 

 Limacella Brard be adopted. 



(2). Philomycus (or Limacella^ nebulosus. It is hardly fair to say 

 that I give no characters for this, as I expressly state that it is the 

 T. carolinensis of Binney, the anatomy, jaw, and other characters of 

 which are well described in the Terr. Moll. U. S. I believe still that 

 it is distinct from true carolinensis, but I rejoice that Mr. Pilsbry is 

 going to make a more careful study of these slugs, and if he finds 

 after examining amjile material that I was mistaken, nobody will 

 more readily accept the fact than myself. 



MOLLUSKS OF SAN FRANCISCO COUNTY. 



BY WILLIARD M. WOOD, OF SAN FRANCISCO, CAL., AND WM. T. 

 RAYMOND, OF OAKLAND, CAL. 



The following species have been collected by ourselves, with the 

 exception of Alexia myosotis, Limncea nuttaUiana, obrnssa, Physa 

 diaphana, Planorbis ammon and Ancylus fragilis, which are given 

 on the excellent authority of Dr. Cooper and others. While the 

 list is undoubtedly incomplete, we believe it indicates fairly well the 

 niolluscan fauna of this County. There is no evidence that Can- 

 tharus gemmatus and Scala gYcrnlandica have been found living 

 here. Their occurrence on our beaches is probably accidental. 



