152 POPULAR CONCHOLOGY. 



They are found in great abundance at the Cape 

 of Good Hope. One species frequently fixes 

 itself upon other living shells, particularly 

 upon the Purpura, and of course follows it in 

 all its movements. 



25. Calyptilea. — Shell variable in form, 

 and often very brittle, with a cup or funnel- 

 shaped appendage in the interior. 

 Animal, head large, having two 

 long thin tentacula, pointed at the 

 end, and furnished with eyes in 

 the middle; foot not large. — 35 

 species recent, and 5 fossil. 



The shell of the Calyptrcea is often irregular 

 in shape, similar to that of the last genus, and 

 is often, like the Crepidula, found attached 

 to large stones, shells, &c. : the outside is 

 frequently covered with spines or ribs. It is 

 generally thin, and not coloured. One species 

 is called the Cup and Saucer Limpet, from its 

 resemblance to those articles; it is brought 

 from the South Seas. Another very curious 

 species multiplies the little funnel-shaped ap- 

 pendage, so that it forms several little stages 

 one above the other ; it is called the CalyptrcBa 



