90 PICTURE OF ORGANIZED NATURE. 



5. The Mollusces and Worms of the sea are most 

 plentiful within the Tropics, where they grow the 

 largest, and are furnished with the handsomest 

 shells : but Zoega caught Nereides in the sea about 

 Iceland ; where Koenig also met with Aphrodites, 

 and particularly Amphitrites, in large quantities. 

 Several shells are found, according to Crantz, in the 

 seas about Greenland. They of course spread be- 

 yond that region where the snow- line on the main 

 land touches the earth, but how far has not yet been 

 ascertained. 



6. The Zoophytes of the sea, and especially the 

 Coral Polypes, are peculiar to the seas between the 

 Tropics, where the beds of Coral gradually in- 

 crease so as to form Islands. According to Koenig, 

 some Zoophytes are found in the sea about Iceland ; 

 and Sea-Pads and Sea- Urchins, according to Crantz, 

 are met with near Greenland. They, however, in all 

 probability, do not spread beyond those regions. 



