484 



THF 1 MI RIl [\ \ iJiR 1/ /^i [\oL XI I 



coadaptation. This joining is so perfect m the higher forms, such as Cvbi 

 that if after the prothorax has been detached from the after-bodv an atf e 

 be made to replace it in its natural position, this is ver\' easily effected: 



A (limimslu'd ir.si.sfancr to f/ir irafer has been brought about in 

 manv wavs,^ notahlv hv the roinuhiig of the contours of the body 

 especially at the neck and shoulders, so that it assumes a l)oat 

 shaped formf; by the depression of the evesf; by the loss of hairt 

 and sculpture; by reversal of theantennie; by recession of the fore 

 and middle legs into the concavities beneatli the thorax at the sides; 

 and 1)V the flattennig ol tlic hind legs m the horizontal planef. 



brouy-ht about in nianv wavs. the seven most striknig'of which 

 art i> tollous — th( flittcnin. dounan.Isold(ini^ta>toftlu hind 

 co\. I u i /> / / f th( \. mill .lilt u< oMht iiHi i>r(Muim, 



ment of braces at the loints to tiirihcr hunt motion to one plane, 

 making the leg more rigid and oar-hke; the shortenmg ot the prox- 

 imal joints of tlie leg f ; the lengthening ot the joints ot the tarsusf 

 accompanied l)v the flattening ot these joints and occasionally 

 ot tlie tibial sj)urs as well; the development of swimming fringes 



