M 1.1 ; I -11 < VARIATION. 



[PART i. 



iru. -:. inal ribs (Fig. 12, II.). The measurements are given by 

 l-'i i;i:i:isi.i.i: tor 7 specimens, of which those relating to two ex- 

 TM -me cases (here figured) are appended. 



l-'i IMIKINGER, M., Mnrjih. Julirb., 1ST!), v. pp. 3SG and 387. 



60. l-\ <-'.in|i:iri>itii of specimens of the Pigeon, Columba livia, var. 

 domestica, .1 Hiuilar correlation was found to occur, as shewn in 

 KILT. 1') I. ami 1 1. 1 Fiirbringer's specimens A and E). 



Cr \W tr M\'frXl' St' XI 



Id 



I! 



FlO. 1H. 1 1; i l.iMcliial ].!i-\n~ and cervical ribs in two Pigeons (C. lii-/,i, 



vnr. >/;/. ' MIT l-'iirlirin^iT. 



I. C:i>.- in \\liich the l-.'th. i::tli :in.l 1 1th vn trl,r:i. IM.IV ccrvioal ribs. II. Case 

 in which tin- i::th. 1 hli :ni<l l.'.tii bm-. < -r\ ical ribs. Letters as in Fig. 12. 



\<>\\ 



measurements of the ribs of 



imlividuals were as fol- 



