392 



P^OOLOGY 



SECT. 



ra — 



metacarpal bears two phalanges, the proximal one (jth.Q') produced 

 postaxialiy into a flange, the distal one {'phS2") pointed ; the third 



metacarpal bears a single pointed 

 phalanx {'ph. J). 



The j)elvic girdle (Fig. 1027) resembles 

 that of no other Vertebrate with the 

 exception of some Dinosaurs. The 

 ilium {it.) is an immense bone attached 

 by fibrous union to the whole of the 

 synsacrum and becoming nnkylosed with 

 it in the adult. It is divisible into pre- 

 acetahular and post-acetalulnr portions of 

 approximately equal size. As usual it 

 furnishes the dorsal portion of the 

 acetabulum, and on the posterior edge 

 of that cavity is produced into a process, 

 the antitrochanter (a.tr.), which works 

 against the trochanter, a process of the 

 femur. The ventral portion of the 

 acetabulum is furnished in about equal 

 proportions by the pubis and ischium 

 (Fig. 1080) : it is iiot completely closed 

 by bone, but is j^erforated by an aperture 

 covered by membrane in the recent 

 state. Both pubis and ischium are 

 directed sharply backwards from their dorsal or acetabular ends. The 

 ischium (is.) is a broad bone, ankylosed posteriorly with the ilium, 

 and separated from it in front by an ischiadic foravien (Fig. 1027, 

 is. for. ; Fig. 1036, i.s.f.). The ^nibis (p>u.) is a slender, curved rod, 

 parallel with the ventral 

 edo-e of the ischium, and 



separated from it by an --r-— •\ — -»^\ /^'^•W:r?-?;':"| isf. 



obturator notch (Fig. 



1027, oU.n. ; Fig. 108C, 



oh.f.). Neither ischium 



nor pubis unites ven- 



trally with its fellow to 



form a symphysis. 



In the hind-limb the 

 femur (Fig. 1037,/^.) is 

 a comparatively short 

 bone. Its proximal ex- 

 tremity bears a pro- 

 minent irochanfcr (tr.) 

 and a rounded head 

 angles to the 

 indeed the w 



I 



Fig. 1030.— Columbalivia, Lc't 

 inaims uf a nestling. The ear- 

 tilaginiius parts are dotted. 

 <■/). 1, radiate ; cp. „', uliiarc ; 

 mcp.l,'2,o, metacarpals; ph.l, 

 jihalanx of first digit; 7)//..'?, 

 'ph. 'S ,-\)\ia\i\ngC!i of second dif^it ; 

 ph. 3, phalanx of third digit ; 

 ra. radius ; ul. ulna. (From 

 Parker's Zootomy.) 



Fii;. 10;?('i.— Columba livia. Left innominate of a nost- 

 ling. The cartilage is dotted. ac. acctabulinn ; n. tr. 

 anti-troelianter ; il . pre-acetabnlar, and (7'. post-uceta- 

 Itular portion of ilium; i«. ischium ; «. .v. /. ischiadic 

 foramen ; oh.f. obturator notch ; jm. pubis. (From 

 I'arker s ZootiriHy.) 



rio-ht 



(iid.), the axis of which is at 

 shaft of the bone ; so that the femur, and 

 lole limb, lies in a plane parallel with the 



