34 TROCHUS. TURBO. HELIX. 



Britain. New Zealand, Friendly Isles, Red Sea, 

 and most other seas, afford the various species. 

 Two of this genus have the power of collecting 

 parts of shells and other testaceous substances, 

 which adhere strongly to the whorls of the shell : 

 it is called the Conchologist. The other, named 

 Mineralogist, is loaded with stones, pebbles, 

 ores, &c. When heavily laden they are consi- 

 dered rarities. 



" There is a great similarity between the genera 

 Tiirho and Trochus. You must observe the 

 generic distinction carefully. Shell univalve, 

 spiral ; aperture contracted, orbicular, entire. 

 The one hundred and sixty-seven species have 

 been much divided by other writers. The golden- 

 mouthed Tiirho is a very fine shell. This genus 

 also contains the common periwincle, an inhabitant 

 of most European shores. Sailors report that if 

 the animal is seen creeping high up the rocks, it 

 foretells stormy weather. Turbo muricatus is a 

 pretty shell.'' (Plate 7-) 



" Now we can tell the next genus," said Lucy. 

 *' Helix f snail. But what a number of different 

 shapes, father, those shells have ! they are not 

 all snails, I should think, that you have placed 

 on the table." 



" According to Linnaeus they are all of the 

 o-enus Helix\ which contains two hundred and 

 sixty-seven species. Many kinds are land- 



