i:u 



ixvri;thi!1!AT1': animals. 



whidi is ]irovi(leil witli eyes ami with twii ov more feelers, which 

 dirter fioin tlie aiitei]ii:u of Inserts ami C'rustacean.s in not being 

 jointed. The month i.s placed on the iiifeiior surface of the head, 

 and i.s .sometimes furnished with one or more ])airs of horny jaws 

 which Work frnni side to side. The n|)])er part of the alimentary 

 canal is mnsenlar, and can In/ turned inside out, or jiroti'uded beyond 

 the true opening of the mniith. The psendoha-'Uial system is well 

 develii|ie(l, and its contaiiied fluid is mostly ml. lo'spiration is 



effected liy I'.xternal jirocesses, gills oi- branchiae arranged in tufts 

 Jilace.l .alojig the sides or back of the body, .and not coidlned to 

 the injmeiliate nrighlj,au'li(«.il of lli,. he.-id, .-is in Tiihiraht. The 

 sexes .are in ilill'ereiit indi\-idnals, .•iiid the young |);iss through a 

 metamorphosis. 



Amongst Ihr best known .and romnionest of tlie Fa'rant .\nnelides 

 ■'"■ li'" eomnion bolKWovm ( A ,;■„;,;,/, , j,;.-<r,,f,„;,„i) ; the Sea-centi- 



