BUBBLE - SHELL. 
43 
lusks. Some of the latter may be caught at low 
water, and they show very tine colors and paint- 
ing. This species is named Tornatella pwictocce- 
lata , Cpr., and from its peculiar stripes is com- 
monly called the Barrel-shell. It is about one 
half an inch in length, oval, very few whorled, 
with a fold on the columella, pure white, with 
two series of tine, black, spiral bands. 
Bulla nebulosa , Gld., Clouded Bubble-shell, 
Fig. 6, PI. XI, is a large, thin, globular shell, 
abounding in southern waters. Its color is 
brown, mottled with black and yellow clouds. 
The spire is depressed, leaving a hole; length, 
one to two inches. 
Haminea vesieula , Gld., White Bubble-shell, 
resembles the last in form, but is smaller, nearly 
white, very thin and delicate. This species 
lives in slimy mud, and eats animal substances. 
With this shell we must take leave of the Gas- 
teropods and turn our attention to the less 
highly organized, but equally interesting La- 
mellibranchs. 
