I '.Ml Mi:i:l-Tli \ A.RIATION. [PART i. 



rally if m-i alway- a disturbance in the paired arrange- 

 !;:{. im-ii!. A -impl.- -a-- oi this kiud occurring in the dog is represented 



in I 33 Tli.- animal i> a male bulldog lately in my possession. 



<>n th- i le there are four nipples, while on the left there 



ti\i-. Tin- most anterior m each .side stand almost at the same 



1 .n the thorax. The second on each side are almost at the 



(..-low them, that on the left side being in. higher. 



Similarly the ni".-t posterior nipples stand on each side at alnnt 



tly tip -aim- I'-vel on the sheath of the penis, the total length 



from tin' first to the last nipple on each side being practically the 



same. ' 'n the left however there are two nipples placed between 



th'- second and tin- la-t. but n the right there is only one. This 



nipple stands at a level not far from the middle between the 



:'>id and 4th of the <. ther side, making as it were a complement to 



UF halaiifr \\ ith I In-ill. 



I ( ''4. Thirty-five \i>iin^ pigs examined with regard in these questions 



; toilouin-- i-'-suhv They helon;_M-d t< five litters (oU puiv- 



i Tamuortli- : ~> cross-bred, nut of l!.-i-k>hiiv s<w. sire unknown ). 



Th- - were all quite \..un^. about a fortnight old, and conse- 



'|iientl\ there wa- no displacement due to functional development 



of tin- 



MA MM i . 



. I I'j, . 



A. t> ii regularly arranged in*pairs ..................... :; 



I'.. 7 7 ..................... 10 



ditto oth rudimentary ............ 1 



ditto 4th rudimentary ............ :i 



Iv 7 s all paired exc. 1. 4th rfldimentary .. ............. 2 



I-'. 7 s 1. 4th rudimentary, 1. 3rd and 5th displaced... 1 



s rt -Jud balances \. I'nd and :!rd .................. 1 



H. -7 1. 2nd balances rt. 2nd and !3rd .................. 1 



7 I. onl balaners i-t. :,nl and 4th .................. 1 



K. i 7 rt. I-' balances I. Nt and 2nd .................. 1 



I.. "I 7 1. -Jnd rudinientai-y 1. 1st and onl dis]ilaced. . . ] 



7 all paired exc. 1 4th nil linieiitarv ............... 1 



M. 7 ~ altogether irregular ........................... 4 



< ). ii <; ditto ........................ "' o 



P. 7 ii ditto ........................ ' J 1 



<, 7 s ditto ....................... i 



K. s - - 7 ditto ....................... I 



Total 35 



Tin- animals in groups D and K. except ...... ,,f thelatter.be- 



same litter. In them a small rudimentary nipple 



..1 betu,.,.|, the :in| .-Mid .".th. but the latter were not spaced out 



*'" i'. being Q Further apart bhananj oftheothers. The measure- 



