MALACOZOA. GASTEROPODA. f ULMOBRANCHIATA. TERRESTRIA. 43 



Limdciens, Lamarck. Limacinea, in part, Blainville. 

 NudilimdceSj Latreille. Limax, a slug. 



GENUS 1 . ARION. Animal elongated, convex above ; 

 with the shield granulated ; a mucous pore at the end 

 of the body above ; pulmonary orifice near the fore part of 

 the shield. Arion was a horse remarkable for its speed ; 

 but our Arion is remarkable for its slowness. Ferussac. 



1 . Arion ater. Shield granulated, mantle with longi- 

 tudinal, branched ridges ; upper parts generally black. 

 Ater, black. 



GENUS 2. LIMAX. Animal elongated, convex above ; 

 with the shield marked with concentric lines ; pulmonary 

 orifice near the hind part of the shield. Limax, a slug. 

 Linnaeus. Ferussac. 



1. Limax cinereus. Shield elongated, mantle with 

 parallel, somewhat undulated ridges ; a prominent acute 

 undulated keel on the posterior third of the body ; the 

 upper parts dusky brown with five pale-brown longi- 

 tudinal bands, or variously spotted. Cinereus, ash-grey. 



2. Limax varieydtus. Shield short, sulcato-granulate, 

 the posterior fourth of the body with a medial crenate 

 keel ; upper parts reddish or yellowish-brown, thickly 

 spotted with blackish-brown. Varieydtus, of different 

 colours. 



3. Limax ayrestis. Shield large, striato-sulcate ; a 

 short obliquely bent keel toward the end of the body, 

 upper parts yellowish-grey or pale-brown, somewhat 

 mottled with dusky and whitish. Ayrestis, residing in 

 fields. 



4. Limax marginatus. Shield elongated, with large 

 undulated ridges, a rather obtuse white keel in the whole 

 length of the body, the shield yellowish-grey with two 

 longitudinal brown bands, the hind part of the body 

 bluish-grey. Maryinatus> having a margin. 



FAMILY II. HELICINA. 



Body elongated, spiral, united anteriorly with the foot, 

 and covered by a spiral shell ; four retractile tentacula ; 

 eyes on the summits of the upper. 



