STJBKINGDOM MOLLUSCA. 



ing its prey with its terrible armature (odontophora) or tooth- 

 ribbon, analogous to the band of a chain saw, and set with 

 adamantine teeth, sharp-edged, and pointed as those of a shark 



mg. 



Fig. 





Teeth of Murex. 



Cyprcea tigris. 



The Cyprseidae (Cowries) have the mantle, in many spe- 

 cies, covered with filaments and the foot enormously devel- 

 oped. The eyes are near the base of the tentacles, and the 

 tooth-ribbon is armed with a series of powerful teeth. 



The Harpidae (harp-shells) are found on the shores of 

 the Mauritius, and are remarkable for having too large a 

 foot wholly to conceal within the shell. 

 The Haliotidse (sea-ears) have shells of a pearly lustre, 

 with resplendent metallic hues, useful for 

 inlaying the darker woods and for sleeve- 

 links. 



The Fissurelidae (fissured) have an 

 aperture in the top, and, adhering to the 

 rocks, seem adapted Fig ^ 3 



to a sedentary life. 

 The Dentalidse (toothed) have a 

 shell shaped like a miniature elephant's 

 tusk. At the base of the conical foot is situated the head 



Fig. 



Fissurella listiri. 



Dentatium (jentalis. 



ORDER PULMONIFERA. 



General Characteristics. The Pulmonifers (lung- 

 bearers) are air-breathing, even those inhabiting the water 

 being obliged to come frequently to the surface. They have 



