AN ARTHROPOD A. 135 



pedes {Nerds) ; and the Sea-mice {Aphrodite and Polynoe\ some of 

 which attain a large size, and are conspicuous for their iridescent 

 bristles. Other less abundant forms may be readily obtained by 

 searching under stones at low water. In one remarkable Annelide, 

 from the Philippine Islands, the body is branched, and thus becomes 

 truly composite. A few of the Errant Annelides live in the open 

 ocean. 



