AND THEIR ORDERS. 81
" By attention to the description," said his mother; " and at the end of the book here are plates, which, perhaps, will help you."
Lewis turned to the plates; and with the assistance of them, and the description given, he came at last to the conclusion, that the shell in question must be the lepas anatifera.
" And now," said Mrs. Ashton, " you have been very persevering, and I will endeavour to tell you something interesting respecting the lepas. These extraordinary shell-fish are never found detached from other substances: they adhere firmly to rocks and stones, and even to larger fish, such as the whale. The numbers which sometimes attach themselves to the sides of vessels, add so