64 
Le dimensioni degli individui variano assai poco, mantenen- 
dosi generalmente in /ong. 28—32, diam. 14-42 4/4 millim. 
ve 66 - III. Bulimus detritus (Helix) Mill. Verm, IL p. 404. 
(4774). 
S. (Helix sepium Gmel. 
(Bul. radiatus Brug. et auctior. 
Icon. C. Pfr. I. t. 3. f 4A—6. — Fér. t. 442. f, 4. 6. 
= Rossm. I. f. 42, | 
var. a. alba, unicolor. 
a 
— b. alba vel grisea, fusco-radiata. 
— c. alba, hyalino-radiata. 
— d. 
albo-lutea, fusco-radiata. 
4. Prov. di Verona, Vicenza e Belluno. 
= 67 - IV. Bul. obscurus (Helix) Mill. Verm. II p. 403. 
(4774). 
S. (B. obscurus Drap. 
(B. hordaceus Brug. 
Zcon. Rossm. VI. f. 387. 
68 - V. Bul. quadridens (Helix) Mill. Verm. II. p. 407. 
(4774). % 
S. (5. quadridens Brug. 
( Pupa quadridens Drap. 
Icom. Rossm. VI, f. 308. 
ZH. Prov. Verona, Vicenza ed Udine. 
«sw 69 - VI. Bul. tridens ( Helix ) Mill. Verm. IL. p. 406. (4774). 
S. (B. tridens Brug. 
( Pupa tridens Drap. 
Icon. Rossm. I. f. 33. 
var. a. major, long. 42—413, diam. 5 millim, 
