1889.] NATURAL SCIENCES OF PHILADELPHIA. 329 



posterior extremity. These last named are so faint and indistinct 

 that they cannot be accurately noted. At the knee an oblique band 

 extends outward and downward and intersects the oblique tibial 

 band, which in this genus is of large size and can be traced across 

 the wing membrane almost to the forearm. 



The intercostal humeral line arises high up towards the axillaj 

 is slightly curved with the concavity toward the body, and is 

 intimately associated with the oblique lines already described. 

 Beyond these lines and at a point proximal to the elbow, a delicate 

 line extends below this joint where it terminates on a line between 

 the elbow and ankle. The internal cutaneous system arises to 

 inner side of humerus directly proximal to elbow. It soon divides 

 into two branches, the vertical and oblique. Above the oblique is 

 a delicate line in the position of the horizontal of other forms, but 

 it appears to be fibrous only, that is to say is part of the trabecular 

 system and is distinct from the nerve or vessel. This line may 

 receive the name, paraneural. A very delicate oblique band is 

 discernible by careful inspection at the muscle-mass at proximal end 

 of the fifth metacarpal bone, extending on the prebrachium. 



The fourth interspace exhibits a single nerve in palmar end of 

 space. This soon divides into a predigital and a postdigital. The 

 predigital runs near the fifth metacarpal bone and parallel with it 

 to its middle ; it is then deflected obliquely downward and forward 

 to supply more than half of the fourth interspace. The postdigital 

 lies along side of the fourth metacarpal bone as far as the middle 

 and thence is deflected at a more acute angle than the preceding 

 nerve and is distributed to the anterior third about of the interspace. 

 The predigital divides just before reaching the metacarpophalangeal 

 joint. The postdigital is seen just above the first interphalangeal 

 joint. The third interspace has a delicate nerve passing downward 

 and forward from the first interphalangeal joint of the fourth finger 

 and a second longer nerve from the metacarpo-phalangeal joint of 

 the third finger. 



The terminal phalanx of the third finger of very flexible cartilage, 

 that of the third finger augulated at distal third, but not L-shaped ; 

 that of the fifth finger deflected so as to lie its entire length in 

 the free margin of the membrane. 



Interfemoral membrane without distinctive lines. 



