CHROMOSOMES OF HIPPONOE AND MOIKA. 1 s 5 



pair of rods the same length a- tin- long arm. There is no obser- 

 vational basis as yet for either of the-e a umptions. Neither 

 dot- our evidence place Hipponoc in class B since Profes-"i 

 Tennent's hybridization experiment- -how that the hook must 

 come from the male. If however the hook is not a multiple 

 chromo-onie the ra-e i- analogous to < la H, the >e\ formula- 

 rrvi-r-t-d to indicate that the male i- a hetero/\uou- 

 and the frmale a pure I ,<. XO = c? ami 00 



= 9 . Tin . onclu-ion i-- the -ame if we identify the differential 

 dement \\iih t In- 1 MI- arm of tlu-hook and a>sumr that none of 

 tin oiitain a corrf-|iondin- |>air of lorn: ro<l-. 



1 If.irly our i !u-iin- as t" the eompo-ition ,.f tl u - hook and 



it- iiu-anin^ imi-t 1 I until our kno\ has been in- 



: \>\ further evidence gained from thi> and otlu-r -pt-t -\< -. 

 M> i lung's views upon th( -loniif \ahu- of tin- chromo-mnal 



onipli ihat the >tud\ -of other species of the same ^t-nus 



\\oiild |>ri-\t- most profit. ilili-. From a eoinpari-on ..f the t \\ o 

 species "I the _emi- .1 -crilu-il |.\ Tt inient and lialt/i-r 



one tin(U -imilaiitie- in the ( hrom. -otnal ;^roiii> \vhiehlend 

 nifit an e to thi- -ir^^e-tion. liroadt-r c\ t< ilo-ieal >tml\' of the 



echinoderma is also necessary in order to di- 'he fundamental 



prineiplt- \>\ wliieh \\r i an refmi ile ->urh di\er>e plu-nomi-n.: 

 lho-e |(it-eiiied } <\ and h'.chiniis on the otio 



hand and // on the other. The diflieultii-s which attend 



tin -tinl\ of e. hinodei in ehronio-onif- make- it dr-iral>lr to 

 extend tin nunil't i . -f \\orkt-r- in tin- lit-ld. 



mm ii 'f.K AI-IIN 

 Baltzer, F. 

 '08 i ; Seeigleiern. \Vrh. .1. 



.1 / 



'098 1 >n- i In hv. u. 1 Ai. li. I. /! 



II. 



'ogb i -uiikhi!! -.ini'lt-n-l- B litivuiiK 



lniii.itiiiv-ih.il;ni--' /.. H'l. XXX\'. 



'10 I'lx-i .lit- !</!. -lui: ii'-n ilnn ('liiniii.itin u. <1. Kntwii kluiiK u. \"rn-r- 



l)iiiii;srii-litin. I: i-t.ii.lni. At. Ii. f. Zellforsch., l'>-\ \'. 

 Boveri, Th. 



'07 /rlli-Il-Ul.li'-ll. Mi-It VI .! : 



Castle, W. E. 



'09 \ M' -ivlrti.ui Vi. . - Science. N. S Vol. XXIX.. N.I. 



