ZONITES. 99 



inch in diameter, flat above, and a little convex be- 

 neath, with six volutions, which enlarge gradually 

 from the centre ; of a crystalline or watery trans- 

 parency with a slight tinge of green ; aperture 

 crescent-shaped ; umbilicus deep and rather large. 



It may be known from the young of any of the 

 former species by its watery transparency, and by 

 the number and regularity of its volutions, which 

 increase in a gradual proportion, not having the 

 outer one much larger than the rest. 



c. Shell trochiform, shining; axis imperf orated. 

 (Conulus.) 



33. 9. ZONITES fulvus. Top-shaped Snail. Shell 

 rather conic and trochiform, beneath flattish, 

 with six volutions, dark horn-coloured, smooth, 

 and glossy ; aperture narrow, crescent-shaped ; 

 umbilicus minute, (t. 5. f. 47.) 



Helix fulva. Mutter, Hist. 36.; Nikon, 13.; Drap. p. 81. t. 7. 

 f. 12, 13.; Rossm. Icon. viii. f. 535.; Forbes and Hanley, 

 B. M. iv. 75. t. 118. f. 8, 9. Teba fulva. Leach, Moll. 

 Sijn. 72. Helix trochiformis. Mont. p. 427. t. 11. f. 9.; 

 Jeffreys, Linn. Trans, xvi. 331., not Ferussac. Helix 

 Trochulus. Miiller?? Dillwyn, p. 916. Helix nitidula. 

 V. Alien, Erd. u. Flus. Conch. 53. t. 4. f. 8. Helix Trochilus- 

 Fleming, B. A. 260. Helix chersina. Say, Jour. Acad. 

 Philad. ii. 156.; Gould. Inv. Mass. 135. f. 105. Helix 

 Mandralisci. Bivon. Cornulus fulvus. Fitz. Syst 94. 

 Polita fulva. Held. Isis. 1837,916. Petavia trochiformis. 

 Beck, Ind. 41. Zonites (Conulus) fulvus. Moq. Tandon, 

 Moll. Franc, ii. 67. t, 8. f. 14. 



Var. 1. Mortonii, shell depressed, both sides nearly equally 

 convex : Helix Mortonii. Jeffreys, Linn. Trans, xvi. 332. 

 " Trochus terrestris (3. Mortonii Da Costa." Jeffreys. 



Var. 2. Alderi, smaller, darker. Alder, Mag. Z. and B. ii. 108. 



Inhab. woods, among leaves and under stones, and 

 on decayed wood. 



H 2 



