240 PROCEEDINGS OE THE SCIENTIFIC ASSOCIATION. 
Zonites Montfort 1810. 
Terrestrial Xnoperculata with very thin transparent de- 
pressed umbilicate helix-shaped shells. 
To this genus probably belong the shells included in the 
subgenus Conulus , but the latter have a very narrow per- 
foration in place of the wider umbilicus of the typical spe- 
cies. The genus is distinguished from Myalina by the 
presence in Zonites of a retractile caudal appendage. 
Zonites Guildingi Bland. 
Stenopus Guildingi, Bland , Ann. Lye. Nat. Hist. New - York, 
vol. viii., /G8 Q5J p. 157. 
Zonites Guildingi, Guppy, Ann. Mag. Nat. Mist., 4 ser., 
vol. i.,.p. 439. 
A very thin amber-colored umbilicate depressed-orbicu- 
late shell with a lunate aperture. Height 4% mill., greatest 
breadth 9 mill. I have only found this species on the 
Cerros of Aripo, but Mr. Bland describes it from Venezuela. 
Zonites implicans Guppy. 
Ann. Sf Mag. Nat. Mist., 4 ser., vol. i., p. 440. 
A minute widely umbilicate discoidal shell with 4 de- 
pressed whorls. Height £ mill., breadth 2 mill. 
Zonites umbratilis Guppy. 
Ann. $ Mag. Nat. Mist., 4 ser., vol. i., p. 440. 
A .species scarcely larger than the last, but distinguished 
by its regular striation and deeper umbilicus. It has 5^-6 
whorls. Height £ mill., breadth 1 £ mill. This and the 
preceding species are found amongst the vegetable matter 
at the roots of trees at Maracas and other valleys in the 
northern hills. 
