Animal of Campelonia, 

 showing its large foot, its 

 tapering tentacles, and 

 the rounded rostrum, or 

 proboscis, between them. 

 (Binney.) 



and the whole shell was solid and heavy. The aperture was tightly 

 closed by the operculum. 



While Harry was holding the shell in his hand, the animal came 

 forth and stretched itself out to its fullest extent. Attention was 

 immediately attracted to the enormously wide, thin foot, which seemed 

 to envelop the rest of the animal in its ample folds. The tentacles 

 and snout were short, and the eyes were placed near the base of the 

 tentacles, on the outside, where they were much thickened. The oper- 

 culum was attached to the back of the foot, and was oval in shape, 



being made up of many concentric rings; it was 

 also tough and horny. 



Having collected a number of the apple snails, 

 besides some others, our party walked to another 

 part of the lake, where the bottom was muddy, 

 and where the water contained some water-plants. 

 Here the wire scoop came into play. The first haul 

 produced nothing but a few pebbles and a lot of mud. 

 Fearing that the handle was not long enough, 

 all of the joints were attached and we tried again. 

 This time it was not in vain, for the scoop came up 

 filled with soft mud, which was literally loaded with 

 the shells of a small snail, Amnicola limosa, and with several varieties 

 of the little clams like those which were collected on the previous trip. 



The snails were placed in a bottle of water, and soon came out, and 

 began to crawl up the sides of the glass. With their small foot, long 

 cylindrical tentacles, globular shell, and large operculum, they were very 



interesting specimens. Professor Parker 

 selected a number of these, and also sev- 

 eral of the apple snails and the Pleurocera, 

 and placed them in his pail, to be added 

 to those already in his aquarium at home. 

 Among the apple snails collected were 

 several which had the spire of the shell 

 broken off, and George asked how this 

 was done. The Professor replied that in 

 many of the shells the end of the spire 

 frequently became empty, as the animal built the shell near the aperture. 

 As the dead tip soon became brittle, it broke off, and the animal built a par- 

 tition across the exposed part of the whorls. The shells in this condition 

 are called decollated. In some small marine shells, called Ccecum, the decol- 

 lation takes place to such a degree that when the animal is adult, the shell 



16 



Dorsal and ventral views of ani- 

 mal and shell of Amnicola limosa. 

 Magnified. (Stimpson.) 



