136 AGARDHIA. 



Of these forms, A. blanci is probably a mere local race of 

 ferrari. The others seem to be valid species. Perhaps most 

 of the named varieties of blanci and bourguignatiana are 

 superfluous. 



1. Agardhia perrari (Porro). PL 17, figs. 18 to 22. 



The shell is narrowly umbilicate, cylindric, blunt at the 

 ends, cinnamon-buff, paler at the rounded summit. First 2 

 whorls are smooth, riblets then beginning weakly. The cylin- 

 dric part is closely and evenly costulate, the riblets oblique, 

 retractive, becoming less oblique on the last whorl, where there 

 are about 13 in a millimeter. They become finer behind the 

 peristome. The whorls are slightly convex, the last one con- 

 tracted and turning forward as it approaches the aperture, 

 pinched into a prominent keel at the base ; there is an im- 

 pression behind the outer lip above the middle, and a shallow 

 furrow near and parallel to the base. The aperture is trape- 

 zoidal, rounded below, angular above, the sides subparallel. 

 There is a strong, oblique parietal lamella and a transverse, 

 median eolumellar lamella, neither of them reaching the peri- 

 stome. Three deeply-placed palatal folds, the lower-palatal 

 moderately long, the wholly immersed basal very short ; often 

 another minute fold, the sutural, is present, making 4 in all. 

 The peristome is well reflected, thickened, continuous and 

 free, being built forward a little. 



Length 4.9, diam. 1.8 mm. ; 9% whorls. Lugano. 



Length 4.1, diam. 1.7 mm. ; 8% whorls. Lugano. 



Italian Alps of Lombardy and Piedmont and the imme- 

 diately adjacent parts of the Tyrol and Switzerland (south- 

 ern part of Prov. Ticino) ; also Quaternary of Dep. Alpes- 

 Maritimes. Special localities reported are: Valgana in Prov. 

 Como (Porro, type loc.) ; around Lugano, Pazzalino, Castag- 

 nola, Cadro, Monte Bre in the Lake Lugano region (Stabile) ; 

 Varenna, Edolo, Esino, also Nice and San Remo (Flach) ; 

 near Anfo on Lago D'Idro (Spinelli). In France, Pleisto- 

 cene of the Tumulus de Nove near Vence, Dep. Alpes-Mari- 

 times (Bourguignat). 



Pupa ferrari Porro, Malacologia terrestre e fluviale della 



