CHROMOSOMES OF TOXOPNEUSTES VARIECA 1 i - 2O3 



di-tin^uish a particular one of these three V-shaped chromosomes 



a heterochromosome. 



The discovery of individuality of form among the chromo- 

 ~-.nx - in << hinoid- is a very valuable factor in support of Boveri's 

 "Individualitatstheorie" of the chromosomes. One also wrl- 

 con ry MI- h nu-ans of distinguishing parental chroni'.-!ii<^ 



in < ross-fertilized Toxopneustes for instance has been'used 



for -p : li/ati<m 'Tennent, '07 and *io). These rhnnnu- 



somes which show marked individuality of form will be of^special 

 \ahii- in - fertilized eggs, where, as shown l>y llerbst 



('09 .iii-l Kilt/- .'), the chromosomes of one parent arv al- 



most entii minau-d during the first segmentation divi-imis. 



II! I KATl'RE. 

 Baltzer. F. 



'On i Chromosomen bci Sceigcleiern. Vcrh. -1. -I. 



'OOa I >!. liv. u. Ech. micr. Arch. f. Zcllt"i-i h.. 



H.l II. 







'OOb I u-Bastardc mil bes. Bcril- uny. 



'I. ' Anz., B<l. XXX\'. 



Boveri. Th. 



'01 IV. Jena. 



'07 VI Jena. 



'10 I n bei Ncmatodon. Arch. f. Zcllforsi li.. 



l\ . 

 Guycr, M. F. 



Domestic Guinea (Numida meleagris doni.). 

 An.it. An/ IV. 



"OOti lie Domestic Chicken (Callus gallus dom.). An.it. 



CIV. 

 Herbst, C. 



'00 \ VI. Arch. f. Entw. Mech.. Bel. XXVII.. Heft 2. 



McClung, C. E. 



"05 '1 In- > :nplex of Orthopteran Spermatocytes. Biol. Bull., 



V..1. IX, 

 Payne, F. 



'0<J Miosomc Distribution and Their Relation to S 



Bi..l. Hull., XVI. 

 Stevens, N. M. 



'10 An l'iu-(|ii.il I Ik-ierochromosomes in Furlkula. Joiirn. 



/,.,,!.. \,,1 

 Tennent, D. H. 



'07 Tin- > i i.inoiil K.UK*. Biol. Bull., XV. 



'10 Tin- I >. .mill. mi i- ! M.iifiiuil ami l Piiti-rnul Character-; in Ecliino'li-ini 

 llvl.ri.l-, Arch. i. Hutu. Mech., H.I. XXIX. 



