190 LIMAX. 



made of cardboard, if confined in it. The shell or ossicle which 

 is contained under the shield was known to Pliny ; and it was 

 used by the ancient physicians for the sake of its carbonate of 

 lime." (Brit. Conch., i, 13t.) 



Its introduction into the United States was first announced by 

 the writer, in 186T, when it was discovered in cellars in Phila- 

 delphia. Within a few years its presence was signalized at 

 Newport, R. I; Brooklyn, N. Y. ; Pittsburgh, Pa., etc ; and it 

 has now become rather numerous in some localities. A shaded 

 grassy bank in the yard of the Academy of Natural Sciences 

 at Philadelphia affords numerous specimens to the students 

 connected with that institution. 



In deference to the opinion of the principal European mala- 

 cologists I have treated as species a number of forms of Limax 

 which I suspect should be preferably considered varieties only 

 of the present species. 



L. PUNCTULATUS, Sordelli. PL 46, fig. 36. 



Yellowish ash, lighter on the middle of the back, rugose, 

 regularly, somewhat distantly black-spotted ; shield broadly 

 rounded behind, with or without black spots; pulmonary aperture 

 fuscous-margined ; locomotive disk yellowish white, unicolored. 



Length, 4-5 inches. 



Lombardy. 



Said to be distinguished from L. maximus by its different 

 pattern of maculations and the more rounded posterior margin 

 of the shield. Vars. parumpunctatus and Pradde of Pini, and 

 Pinianus Lessona, have been described. 



L. PSARUS, Bourg. PL 46, figs. 31, 42. 



Elegantly cylindrically elongated, terminated by an acute, 

 whitish carinated tail, elongately rugosely reticulated ; bluish 

 ash above, becoming yellowish ash on the flanks, with brilliant 

 black spots on the large shield, and spots and stripes on the 

 body ; shield large, not adhering in front, anteriorly and pos- 

 teriorly rounded, finely, irregularly (not concentrically) striated ; 

 respiratory orifice almost median; disk yellowish white, the 

 marginal areas deeper colored. Length, 3 inches. 



Lombardy. 



A very doubtfully distinct form from L. maximus. 



