114 MKRISTIC VARIATION. [PARTI. 



ha\<- li.-.-n .-.\]..-.-t.-.l had there been an even Homceosis throughout 

 tin- dorso-lumbare.] 



26. Mule, tet. 50. C 7, D 12, L U, S 5, C "3 or 4, probably 4. " 

 Thirteen pairs of ribs, 13th ribs on 20th vertebra, nearly syiu- 

 ni.-tiii-al. right 2 in. long; left 1, and in breadth a little less than 

 the li^ht. The <Hh lumbar, 2oth vertebra, had the characters of 

 a ii.. rn. al laM lumbar (sc. 24th vertebra), including normal trans- 

 verse | ..... Coccyx in 3 moveable pieces, the 3rd apparently 



mposed of two. There is therefore probably one more than 

 th,- ..... -ma! number in the whole series. STUUTHEHS, J. Anat. 



Phys. L875, p. <i2. 



27 Mai,, .if. .">(). ('7, l>12 LO, S5.C3. Dorsal vertebra? and 



ril,-, normal. 20th vertebra normal, except that it has no trace 



transverse processes; ribs have perhaps been present on it. 



h \, rtel.ra ijuite free from sacrum, but articulating with ilium 



1,\ Hnall facet "ii each side. The 1st coccygeal joined to sacrum. 



Sim in! .KS.. /. <:., p. 00 and p. 91. [Homoeosis in absence of trans. 



pi,, in 2oi h \ertebra, in separation of 2oth from sacrum, and 



in union "t 30th \\ith s 



L'v Skeleton ( ' 7, I > 1 L'. I. ', S r>, C lost. The L'.'itli vertebra is separate 

 fi-,,iii the ilium .-Hid tin- saerum. l>ut the .'lutli is united to the latter. 

 3TB1 i HI i>. /. <.. p. l ' 1 .'. 



2g M e, tet. '-"'. ( '~- 1' '-' I- 1 ' 1 '!>' l>e;u-inu r i-il>> Gth partially joined 

 to sacrum), > "' "\du^i\e ( ,t' ."itli lunilcir). C 1. L'Otli vertebra bearing 

 rili- . 'J.'itli |..ii-'iillv I'n-r t>, .in x.-i.-riini lint jiai'tly supporting the ilium, 

 .UK! ojii- e\tr;i \ertel>n in iln- >erie>. S'riM'l II KI;S, I.e., p. (it and p. 92. 



80. Skein,,,, D12, L6,S4, 04. The I'.'.th vertebra l>y i-i.ylit trans- 

 veree i .irii,-ui ii--- \\ith ^:i,-niiu ami on tin- same side with the 



ilium: the .".nth, however, though move;il>|e on tlie ~.;icnnn. has rharac 

 ten ' ran-ii ion;il lift ween thn-i- , ,f a .~>th sacral and a 1st coccygeal. 

 iin.i:-. /..'.. ],. '-^ and p. ( .M. 



.'.I M.ue. ('7. |) l: 1 ,. 1..",. S ami (' ankyl,'-el t ,,:.', ! her of uncertain 



numl'er. Artii -ular pr, ,. ,--,- rhan^i' Let ween L'nt h and L'lst,i.e. a space 

 lo\vei- than u^ual. Init the processes U'tween I'.Uli and L'Oth are smaller 

 than th,,->- liiLrher up and an- n, ,t quite vyinmet ri,-al. The 20th vertebra 

 1,, ,i'e i-il) on 1,-ft side and ril) has apparently hern present on right, but 

 p i,, li.il.lv not >o miieh de\el,,ped. Si i:i ini.i;s, /.,., p. 64, note. [For- 

 \\ard EomOBOSis in de\el,ipment of' rili.s on L'Oth and in detachmont 



25th.] 



lint though the variations of the vertebrae mav thus in great 

 measure ! i-due,-,l (,, system, there remain other eases, rare in 

 M in l>iit n,.t \.-ry iineoiiinioii in lower (onus, \vhirh cannot be 



^ight into ;n,\ system yel le\ised. Such ,-a.ses shew that the 

 liimt^ imposed 1,\ a system of individual homologies, het ween which 



\\e eoneeive the 'iirieiii-e of N'ariat ion, are not natural limits, 



and that they ma\ !,- Bel aside in nature. In the following ease it 

 ma\ In- es| eially noted that X'ariatioii in the segmentation of the 



