THE CLIO. 



147 



tion of which we rise to meditate on the power and 

 goodness of Almighty God, who commanded the waters 

 to " bring forth abundantly the moving creature that 

 hath life," and the earth, every " creeping thing," " and 

 it was so," Gen. i. 20. 24. 



An advance may now be made to the class termed 

 pteropoda, (or wing-footed mollusks,) because they are 

 constructed for moving through the water by means of 

 expanded fin-like membranes placed on each side of the 

 head. Some are naked and destitute of a mantle, as the 

 clio, so abundant in the northern seas ; others, however, 

 as the hyalea and cleodora, have a mantle covered with 

 a shell. 



The Clio boi-ealis (see the an- 

 nexed figure,) is, in fact, a sort of 

 marine slug, with a pair of wing- 

 like fins or oars, attached one to 

 each side of the neck, by means 

 of which the animal rows itself 

 merrily along, and plays amidst 

 the foaming waves, rising or 

 descending at pleasure. These 

 oars are made up of muscular 

 fibres, which pass through the neck from one expanded 

 appendage to the other; so that the organ is, in fact. 



Clio borealis. 



