MAN. 



32 



The carpus differs from that of the rabbit in the absence of a 

 distinct centrale, it being fused with the radiale. The propor- 

 tionate size of the different elements is not the same, carpale 3, 

 for example, being relatively very large. The following will give 

 some idea of the method of arrangement, the theoretical names 

 being placed in parentheses : [R = radius ; U = ulna.] 



R U 



scaphoid semilunar cuneiform pisiform 



(radiale + centrale); (intermedium); (ulnare); 



trapezium trapezoid magnum unciform 



(carpale 1) ; (carp. 2) ; (carp. 3) ; (carp. 4 + carp. 5) 



The skeleton of the hand is completed by five metacarpals, and 

 fourteen phalanges, of which two belong to the thumb, and three 

 to each of the fingers. The first 

 metacarpal articulates with a saddle- 

 shaped surface on the trapezium, 

 which allows of very free move- 

 ment, so that the thumb can be 

 readily opposed to the other digits. 

 (2) Hind -Limb. The ossa inno- 

 minata which constitute the hip- 

 girdles are very broad, and together 

 with the sacrum and coccyx make , 

 up the basin -shaped pelvis, by e 

 which the weight of the trunk is 

 supported and transmitted to the 

 legs. Each os innominatum is 

 made up of the same four elements 

 as in the rabbit i.e., ilium, pubis, 

 ischium, and acetabular ( = coty- 

 loid), but the last is very small 

 and fused with the pubis, of which I 

 for all practical purposes it is con- 

 sidered a part. The ilia are very 

 broad and expanded ; the pubes 

 but not the ischia meet in a median 

 ventral symphysis. The large size 

 and strength of the bones supporting the free limb are worthy 

 of notice. The femur is very long, tibia and fibula are well 

 developed and separate, and there is a large patella. The bones 



L99. MAN. Skeleton of 

 ft Hand. Dorsal view (from 

 Macalister). 1 , Scaphoid ; 2, 

 semilunar; 3, cuneiform; ^pisi- 

 form ; 5, trapezium; 6, trapezoid; 

 7, magnum; 8, unciform; 9-13, 

 metacarpals; b,c,d,e, phalanges. 



