OF CONCHOLOGY. 43 



The animals of this genus adhere 

 to rocks and stones, in general near 

 low water mark, and are, at first view, 

 very like an oniscus. Plate 5th, fig. 

 1st. 



Habitation. The Chitons have only 

 been found to inhabit the ocean. 



In Turton's Linne 28 species of 

 Chitons are described. Seven species 

 have been discovered in the British 

 seas. 



Genus 2nd. — LEPAS. Animal a 

 Triton ; shell affixed at the base, and 

 consisting of many unequal erect 

 valves. Linn. Syst. No. 301. 



The Lepas are termed acorn shells 

 in England. This genus consists of 

 two famihes or divisions, very different 

 in their form. The first of which is 

 the halani, or acorn shells, of a sub- 

 conic form, with an operculum or lid, 

 consisting of either four or six valves. 

 The body of the shell has six valves. 

 Plate 5th, ^g. 2nd ; and plate 1st, fig. 



