158 BULLETIN 43, UNITED STATES NATIONAL MUSEUM. 



The triceps fascicle system crosses the elbow at origin, is without 

 vertical branch, but yields two horizontal primal branches j these ex- 

 tend across the membrane near each other and appear to end in the 

 abruptly determined comb-like endings which do not reach the region 

 of the i)halanges of the fifth finger. There are two oblique lines ex- 

 tending downward and somad from the muscle-mass at distal end of 

 the fifth finger. 



The fourth interspace has the predigital nerve, as in Miniopteris, while 

 the terminal branches do not reach the digits of the fifth finger, but 

 join a branching nerve which appears from the metacarpo-phalangeal 

 joint of the fourth finger. A small unbranchi d line (postdigital nerve ?) 

 appears at the middle of the fourth metacarpal bone. 



Two oblique bands are seen on the fourth interspace near the palm. 

 A fork-like arrangement of lines is seen in the angle between fourth 

 and fifth metacari)al bones, and appears to be a branch of the median 

 dividing into the two branches commonly seen in this interspace. In 

 the third interspace a similar arrangement is seen, but the main nerve 

 pursues a longer course before dividing. At the region of tlie digits 

 there are two x>redigital nerves and three postdigitals. In this portion 

 of the membrane, therefore, an unusually large number of lines are 

 seen. It is x>ossible some of these lines pertain to the blood-vessel 

 system. 



The pelvotibial line is seen on the interfemoral membrane; but the 

 oblique lines from the caudal vertebrj© are distinctly visible. 



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

 no i^art thereof i)rojects; that of the fourth finger is acicular, deflected 

 at a right-angle pollical to the second; it yields a free i^rojecting tip; 

 that of the fifth finger is acicular, is deflected somad and inclosed only 

 on this side. 



The membrane of the first interspace can be discerned everywhere 

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

 third digit. 



^^A-M//._Length, lO^-"'"; greatest width, 9 J"^-" ; least width, 5'"">. The 

 sagittal crest is limited, and ends on the anterior third of the mesen- 

 cephalon. The posterior temporal crest is faintly expressed. Face in 

 advance of orbit 2""". The occipital crest is interrupted in the center. 

 No tubercle is present over the proencephalic foramina. The vertex 

 of the face provided Avith a wide depression Avhich extends to the 

 anterior nasal aperture. The fronto-maxillary inflation is conspicuous, 

 extending back of the anterior temporal im])ression and forming an 

 elevation at the side of the vertex depression. The orbital ridge is 

 small and distinct, is placed well forward, and terminates posteriorly 

 by a tubercle. The inner wall of the orbit is concave; a second tuber- 

 cle lies directly back of the large lachrymal canal. 



The paroccipital process is large, spinous, and is directed obliquely 

 downward and backward for nearly the length of the condyle. The 



