102 THE NAUTILUS. 



in the Ottawa Naturalist for December, 1889. I believe that the 

 species was brought into Oakland about the same time as into 

 Victoria, or, perha2:)S, a year or two earlier ; certainly in 1884-5 it 

 had become very abundant here, in gardens. In the Proc. Cal. 

 Acad. Sci., Second Series, Vol. I, p. 13 (issued Dec. 31, 1887) Dr. 

 J. G. Cooper published my observations on the presence of this Limax 

 in Oakland, and predicted that it would become a pest to gardeners, 

 as in fact it has done. This is the earliest published record of which 

 I have knowledge, and the specimens, sent to Mr. Binnev at that 

 time, are probably those mentioned at the close of Mr. Cockerell's 

 article. This slug is now gaining a foot-hold in San Francisco, for 

 Mr. W. M. AVood has lately submitted specimens, from that city, to 

 me, for examination, and has added the species to the San Francisco 

 County list. 



CATALOGUE OF FISSURELLID^ OF THE UNITED STATES, 



BY H, A. PILSBRY AND C. W. JOHNSON. 



A complete catalogue of the shells of the United States has long 

 been desired by the many collectors who devote their energies espe- 

 cially to American mollusks, and naturally wish to know just what 

 species are to be had. Mr. Campbell has already in these pages 

 catalogued the Halioticlce, and from time to time other groups will 

 be taken up by various members of the American Association of 

 Conchologists. 



The Fissurellidce of our area may be easily known by these 

 peculiarities : the shell is limpet-like, and has either a perforation at 

 or near the apex of the cone, or a slit or notch in its front edge. 

 There are many anatomical characters also, peculiar to the family. 



The group has been divided into three subfamilies, as follows : 



I. Apex of shell entirely removed by the perforation, which is 



bounded inside by a callus-rim which is not truncated be- 

 hind. Central tooth of the radula narrow. Shell entirely 

 external, Fissurellin.e. 



II. Shell as in Fissurellince, but hole larger. Central tooth of 



radula very broad, not narrowed above. Mantle wholly or 

 nearly concealing the shell. Fissukellidin^. 



