
MOLLUSCS, VERMES AND HYDROZOA 

with usually five yellow bands, more distinctly marked on the body whorl. 
It has four to five : 
convex whorls, the 
first a mere dot and 
the body whorl very 
wide and exceed- 
ing half the shell 
in length. All are 

rounded and sharply FIG. 145. Georgia Snail, Viviparus georgianus. 
defined, with impressed suture. The operculum 1s bluntly pearshaped 
and thick, with well defined lines. ‘The body is dark brown, spotted 
with yellow, the snout broad and the tentacles long and divergent. The 
eyes are placed on the outer bases of the tentacles. It 1s ovoviviparus and 
harmless to aquatic plants when sufficiently fed, and bears a close resem- 
blance to the foregoing. Quite generally distributed throughout the Middle 
and Southern States; first found at Hopetown, Georgia. Known as the 
Georgian Snail. Also note the Japanese Snail, . ma/leatus hereafter 
described. 
Campetoma. These snails inhabit still water and slow-flowing 
streams. ‘The shells are thick, heavy and about as long, but narrower than 
the foregoing, and the whorls flatter and not as rounded. ‘The larger 
Eastern and Middle States species rarely exceed 11% inches in length and 
most of the species less than 34 inch. 
C. decisum, Fig. 146, is common in ponds and nearly all freshwater 
in the Eastern section of North America, from Nova Scotia to the Rio 
Grande. The 34 to1 inch long shell is elongate-ovate, rather thick and heavy 
with a smooth surface not 
very considerably marked 
by lines of growth. Its 
color is greenish with 1r- 
regularly disposed brown 
lines of growth and 1s 
usually eroded at the apex 
so that of the five whorls 
sometimes buttwoorthree 
OE Nas atoll remain. The body whorl 
is about two-thirds the length of the shell, the aperture oval-oblique more 
than half the length of the body whorl, and the operculum is elongate- 
ovate with a thin transparent margin. It 1s ovoviviparous and harmless in 
the aquarium, though a considerable feeder and should be furnished with 
food in addition to the alge and conferve. Itis found in streams in New 

229 
