1889.] NATURAL SCIENCES OF PHILADELPHIA. 325 



The pelvotibial line is not seen on the interfemoral membrane ; 

 but the oblique lines from the caudal vertebra? are distinctly visible. 



The terminal phalanx of the third finger is curved only at the tip 

 and no part thereof projects ; that of the fourth finger is acicular, de- 

 flected at a right-angle pollical to the second ; it yields a free project- 

 ing tip ; that of the fifth finger is acicular, is deflected somad and in- 

 closed only on this side. 



The membrane of the first interspace can be discerned every- 

 where along the line of the wing except at part of the first phalanx 

 of the third digit. 



Atalapha noveboracensis. 



The parts much the same as in J., cinerea with the exception of 

 the intercostal lines which are more distinct than in that species and 

 the horizontal limbs of the internal-cutaneous system are farther 

 apart. The third interspace is without predigital lines. The 

 terminal digit of the fourth finger is -without projecting lobe ; that 

 of the fifth finger is minute. 



Lasionycteris noctivagans. 



The prebrachium with distinct tendon of occipito-pollical muscle. 

 The external-cutaneous nerve is seen crossing the angle between the 

 arm and forearm near the elbow. Three conspicuous intercostal 

 lines are discerned. 



The intercosto-humeral line unites with the internal-cutaneous 

 system. It arises high up near the axilla. The internal-cutaneous 

 system with vertical oblique and horizontal lines discernible. None 

 of the terminal lines of the foregoing, viz., the intercostal intercosto- 

 humeral or internal-cutaneous reach the free margin of the wing- 

 membrane. No vertical lines apart from the foregoing are discernible. 

 The oblique tibial line arises from near ankle and extends as far as 

 the intercosto-humeral at the elbow. 



A delicate forked line extends downward and somad from lower 

 part of muscle-mass at the proximal end of the fifth metacarpal 

 bone. 



The fourth interspace exhibits the predigital nerve appearing in 

 a well-defined elevated fold of membrane at the side of the muscle- 

 mass just named. The line forms a curve and extends about one- 

 half way down the shaft of the fifth metacarpal bone when it is lost 

 along the line of the shaft. The main branch of the nerve arises 

 from the middle of the curve and passes downward and forward but 

 does not extend beyond the middle of the interspace, nor quite to its 



