5 02 



MANUAL OF ZOOLOGY 



SECT. 



olecranon process. Distally it articulates with the cunei- 

 form. 



The carpal bones (Fig. 301), nine in number, are all 

 small bones of irregular shape. Eight of these are arranged 

 in two rows, a proximal and a distal ; the ninth, centrale 

 (cent), lies between the two rows. The bones of the proxi- 

 mal row are taken in 

 order from the inner to the 

 outer side scaphoid (sc) , 

 lunar (or semi- lunar) (lun), 

 cuneiform (cun), and pisi- 

 form. Those of the dis- 

 tal row are reckoned in 

 the same order, trapezium 

 ( trpm ) , trapezoid ( trpz) , 

 magnum (mag), and unci- 

 form (unc). 



The five metacarpals are 

 all small but relatively nar- 

 row and elongated bones, 

 the first being smaller than 

 the rest. Each of the five 

 digits has three phalanges, 

 except the first which has only two. The distal (ungual) 

 phalanges are grooved dorsally for the attachment of the 

 horny claw. 



The pelvic arch (Fig. 302) contains the same elements 

 as in the pigeon, but the union of the ilium with the sacrum 

 is less intimate, the acetabulum is not perforated, and the 

 pubes of opposite sides unite ventrally in a symphysis (sy). 

 The ilium and ischium meet in the acetabulum or articular 

 cavity, which they contribute to form for the head of the 

 femur, but the remainder of the cavity is bounded, not by 



IG. 30 



of fore-arm and carpus, dorsal view, the 

 bones bent towards the dorsal side so as 

 to be partly separated: cent, centrale; 

 cun, cuneiform; /, lunar; mag, mag- 

 num; rad, radius; sc, scaphoid; trpz, 

 trapezoid; trpm, trapezium; uln, ulna; 

 unc, unciform; I-V, bases of metacar- 

 pals. (After Krause.) 



