MALAC0Z0A. GASTEROPODA. PULMOBRANCHIATA. TERRESTRIA.45 



rounded turns, covered with very numerous transverse 

 lamellae ; the base convex with a deep umbilicus. Lamel- 

 Idtus, covered with small plaits. 



8. Helix aculedta. — Shell globoso-conical, of six 

 rounded turns, the epidermis rising into thin spinous 

 processes. Aculedtus, prickly. 



9, Helix pulchella. — Shell depressed, equally convex 

 on both sides, deeply umbilicate, greenish-white, the 

 aperture circular with the margin thick, flat, and re- 

 flexed. Pulchellus, small and beautiful. 



Genus 2. Zonites. — Shell orbicular, depressed, flat or 

 little convex above, umbilicate, very thin, spiral ; with 

 the aperture roundish-semilunar, having a very thin 

 margin, incomplete behind. Name from Zcovr), a zone or 

 belt. Montfort, Gray. 



1. Zonites rotunddtus. — Shell flattish, slightly con- 

 vex above, deeply and regularly striate, variegated with 

 spots of reddish-brown and greyish-yellow, the umbili- 

 cus very large, the aperture semilunar. Rotunddtus, 

 rounded. 



2. Zonites celldrius. — Shell flattened, slightly con- 

 vex above, somewhat rugose, shining, transparent, pale 

 yellowish-brown, the last turn opaque and white to a 

 great extent beneath, umbilicus, rather large and deep. 

 Celldrius, living in cellars. 



3. Zonites nitidulus. — Shell depressed, considerably 

 convex above, somewhat rugose, glossy, transparent, 

 light yellowish-brown, the last turn with a small part 

 of the under side along its inner margin whitish and 

 very slightly opaque, umbilicus rather large and deep. 

 Nitidulus, somewhat shining. 



4. Zonites lucidus. — Shell depressed, considerably con- 

 vex above, rather strongly striato-rugose, transparent, 

 glossy above, shining beneath, dull greyish-brown, the 

 whorls convex and inflexed at the suture margin, the 

 last destitute of whiteness or opacity beneath, umbi- 

 licus large and deep, aperture oblique, longer than 

 broad. Lucidus, shining. 



5. Zonites alliurius. — Shell nearly flat, somewhat 



