No. 484] 



ATTACHED YOUNG OF CRAYFISH 



261 



the alxloinen. They tended to climb over one another and one 

 hrld so fast to a dead fellow that it could be shaken loose only 

 wilh (liffK iillN . 'rhey also climbed up on to the dead female an<l 

 on to a piece of ("aiiton flannel where they held fast i)y their chela? 

 for a time and then ,-oi down and >\vam actively if .iisturbed by a 

 l.ipette. 



Thoiiuli the h-.rva in tlie x'cond >ia.uv may thus away from 

 the mother it donbtlcss n^tnrns <'ven into the' third sta,uv a^' Faxon 

 records findin- upon the abdomen of nniseum spe<'ini,MH hirv;e 

 with characters evidently of the third sta^^-. 



The second stage young, figure (>. wtM-e still so tran>hiceiit that 

 in the abdomen the digestive tract and the ventral gant^dia couhl 

 be plainly seen. 



In r. affltn: it was noticed that the young, in i>a-ing from the 

 Mvond to tlie thir.l >tage. was sn.pended from it> < a.t cuticle by an 

 anal thread which bound its anus to that of the ca^t ..ff cuticle 

 an<l as the < law> ..f that cutich- still hehl fast to th.- mother the 



able to take hold again with its uL chiws. ' In ('. riarkli the same 



that die.l just after molting. In these there was a long thread 

 that issue.i from the anus and. pa.>ing .iown through tlie hollow 

 cast olf cuticle of the ab<lom<-n. was fastene<l at the b..ttom of it to 

 the flat telson. By the strain of the anal thread the ca.t otf ab- 

 dominal cuticle had l)een telescoped; tlie old telson being dragij;(>d 

 up against the collapsing rings of the cast cuticle. A> in ( \ a//7///> 

 this anal thread was only the cuti<'ular iim'ng of the intestine not 

 cast off eiuirely at the >ame time with the external cuticle and thus 

 serviceable in "bin.ling the larva to it> old .lu^ll. If thi> tardine.. in 

 casting the lining of the iiu<-stine i> normal in ('. c/url:!/' it would 



upon the mother, which is prollblv tUr ra^v even if it ha^ .ome 



In .•oiUrasting the s^.-ond >tag.', ligure f., with the tir.t, linure 1. 

 we hud an increasr in >i/,e, tin- bo.ly being now .V. mm. long with 



body and in xhv perfection of the limbs. While tile head-diorax 



