IrSr. CHAVFisii, L()iis'i'i:i;s, sriDKUs, and insects 



while tlie oppf)site end is finnly attuflied to some sub- 

 merged (jbject. The hiiily <jt' the huriiacle is inclosed in a 

 sort of hivulved sliell wliicli, in reality, is {•oiii])ose(l of five 

 distinct pieces S(j arranged =.-_ . -;^^^ ^_ - 



— hence the bivalved a-iv 

 pearance, by A\'hich the barnacles le- 

 semble clamlike nioUusks. 



The acorn l:)arnacles have no stalk and 

 resemjjle 1(_)W, blunt ])yraniids in furiii. 

 They are found attached to rocks and piles 

 between tide marks, to ship bottoms, and 

 some s]jecies, at least, are sometimes found 

 attached to Ihe bodies of whales. Some 

 species of acorn barnacles grow eiglit or 

 nine inches in length and are sometimes 

 eaten for food. 



The life liistory of barnacles is rathei- i'4" 

 complex. The adult lays eggs that halch ",<<'wt 

 into ((ueei' 111 tie animals, each of which is 

 called a /r////;/M/x, \\'hich one would n(wei' 

 imagine lo l)e connected with an adull 

 barnacle. After a time this changes inbi 

 another and difl'erent form called the ci/pris 

 form. Finally this, thi'ough successiA-e 

 changes, develops into the adult barnacle. 

 Harnacli's arc peculiar in having no heai't- and no distinct 

 blood vessels. 



Shrimps. — The shrim]is are vei-y closely r(>lated to the 

 lobslers and cra,yfish, and are also ol cdusideralile impor- 

 tance as an ai'licle ol liiiiij. Tlie connniiii slu'inip occurs in 

 abundance on Ihe easlern coasl of Xoiih Aniei'ica, from 



I'l. 



7:?.— Stalked 

 barnacle. 



