122 POPULAR BRITISH CONCHOLOGY. 



The Ca^o of Libert)/, Ciq) and Saucer, and Slipper 

 — Of the former we have one example, the 



PiLEOPSis Ungarica, which is found attached to stones 

 and shells on our coasts, and ranges as far as the coast of 

 Norway northward, and to the Mediterranean southward. 

 The shell is shaped like a cap with a coiled apex ; it is 

 covered outside with a soft fringed epidermis, and has a 

 pretty pink tint inside, Avhere the muscular impressions may 

 be seen shaped like a horseshoe ; the head is distinct, and 

 has eyes at the swelled base of the tentacles ; a tongue with 

 seven teeth, the middle one of which is hooked ; the foot is 

 strong and round ; the mantle fringed. 



Of the latter we have one also — 



Calyptr^a Sinensis, the shell of which has a spiral plate 

 inside — our sole representative of the varied forms of in- 

 ternal laminse, which characterize genera and species of the 

 tribe in more tropical localities. The Cup and Saucer Lim- 

 pet, for instance, of which there are several beautiful species, 

 has either a flat or a conical shell, with funnel-shaped cup in 

 the under side. The Horseshoe Limpet has an internal ap- 

 pendage jutting forward in two points. The Slipper Limpet 



