194 



POPULAR CONCHOLOGY. 



brooks, where it attaches itself to reeds and other aquatic 

 plants, and also to stones ; it moves about also just under 

 the surface of the water, with the back downwards. It 

 is nearly amphibious; for in summer, when the brooks 

 are dried up, it remains in the soft mud until the return 

 of rain, indeed it is also often found out of the water, 

 living only within reach of the spray of a waterfall.* 



Family 6. — AMPHIB OLA CEA. 



The body of this Mollusc can be withdrawn wholly into 

 a spiral-formed shell, with an entire roundish aperture; 

 the head is flat, broad, and bordered, without feelers ; the 

 eyes are sessile; it possesses an operculum. — Found in 

 brackish water. 



Amphibola. Schum. (Ampullacera Quoy and Gaim. ; 

 Thallicera Swain.) — Shell rather thick and 

 globular ; aperture round or oblique, having 

 the lips united ; spire short ; umbilicus deep ; 

 operculum horny, thin, and having some- 

 times a projection. Animal, head broad, 

 flat, edge turned back, bearing on the upper AmpMbola aveaana , 

 side two remote eyes; no tentacula; foot 

 short, four-sided, with a furrow in the front; the lung- 

 cavity large, communicating with the air by means of an 

 opening in the right edge of the mantle ; the parts of the 

 mouth are not yet described ; there exist two linear split 

 glands ; the craw is muscular, as in Auriculacea and Lym- 

 nacea. — 2 or 3 species ; also fossil. 



This Mollusc is found in great abundance in New Ze* 

 land, in pools of brackish water, buried in sandy mud. 



* Turton's Manual. 



