204 LIMAX. 



yellowish ash, often brownish in the middle, with dark lateral 

 zones, pulmonary aperture posterior, light, usually brown- 

 margined; sole thin, pallid, unicolored; mucus watery, very 

 copious. Europe, Iceland. 



The synonyms include L. sylvaticus, Goldfuss ; L. scandens, 

 Normand ; L. scopulorum, Fab. ; L. flavescens, Clark; L. glau- 

 cus, Clark ; L. salicium, Bquillet; L. limbatus, Held ; L. arborum, 

 Bouch. ; L. Livonicus, Schrenck ; L. scandens, Norm. ; L. roseus, 

 and L. coloratus, Broeck ; L. altilis, Fischer ; L. Helvetians, 

 Bourg. ; L. Dianse, Kimakowicz ; L. Heynemanni, Bielz. Some 

 of the above have been described* as varieties, to which may be 

 added the following from Lessona and Pollonera's monograph : 



Yar. TYPUS (L. arborum,, Bouch.). Violet ash, bluish ash or 



brownish, with a median light zone, carina short; shield 



with two dark zones. 

 Yar. NEMOROSUS, Baudon. Like the preceding but with two 



dorsal dark zones in addition, usually maculated on the 



sides. 

 Yar. BETTONII, Sordelli. Like the preceding, but maculated 



additionally with brown and white on the back ; shield with 



a median brown zone and alternating whitish and brown 



zones on the sides. 

 Yar. ALPESTRIS, Lessona and Pollonera. Smaller, with longer 



carina, back unicolored with a light median zone ; shield 



often with confused blackish zones. 

 Yar. FALLENS, Lessona and Pollonera. Light colored, with a 



lighter small zone, and longer carina ; shield light colored 



with obscure zones. 

 Yar. RUPICOLA, Lessona and Pollonera. Small, blackish, with or 



without an obsolete dorsal zone ; carina long. 

 L. Mongianensis, Paulucci, described as a variety, has been 

 separated as a species by Lessona and Pollonera. It cannot be 

 distinguished from marginatus externally, its characters being 

 anatomical. 



L. ECARINATUS, Bottger. PL 50, fig. 89. 



Resembling L. marginatus, but the shield .shorter, broader, 

 almost without caudal carina, concolored, rugae smaller, shorter, 



