346 Vi?SPEElTLIONID^. 



Thumb with a well-developed claw ; and on its inferior surface, 

 from the base of the first phalanx, and from the sides of the 

 metacarpo-phalangeal joint, corresponding to the position of the ball 

 of the thumb in other Bats, arises by a short peduncle a circular 

 hollow suctorial disk about one tenth of an inch in diameter. On 

 the sole of the foot a similar but considerably smaller disk is placed, 

 not in the same relative position, however, as on the thumb, for it 

 covers the metatarsal bones, not the bases of the first phalanges of 

 the toes *. 



The rudimentary metacarpal bone, which alone represents the 

 second finger, is scarcely one third the length of the metacarpal of 

 middle finger, and is fibro-cartilaginous ; the first phalanx of the 

 middle finger exceeds the combined lengths of the second and third 

 phalanges ; tibise very long, considerably longer than the femur ; 

 foot small, completely rotated outwards and forwards by the wing- 

 membrane, which extends quite to the base of the claws ; toes 

 equal in length, united together by a membrane as far as the claws, 

 which are much curved ; calcaneum longer than the foot, and very 

 strong, with two cartilaginous projections behind at right angles to 

 its long axis, which evidently assist the animal when climbing in 

 an upward direction (see fig. 6 in plate accompanying my paper 

 referred to below) ; tail produced beyond the interf emoral membrane 

 to a distance nearly equal to the length of the calcaneum. 



Pur moderately long and dense, forming a thick fringe along the 

 margin of the upper lip towards the angle of the mouth, but the 

 wing- and interfemoral membranes above and beneath are almost 

 naked. Above, reddish brown ; beneath, the greater part of the 

 breast and abdomen are pale yellowish white ; the under surface of 

 the muzzle, the neck, and the sides of the body reddish broAvn ; 

 membranes dark brown. 



Upper incisors short, in pairs, separated from the canines and 

 also in front ; inner incisor on each side directed slightly forwards 

 and inwards, with a second postero-external cusp, outer incisor 

 unicuspidate, as long or slightly longer than the outer cusp of the 

 inner incisor and parallel to it; upper canines small, scarcely 

 longer than the second premolar ; first upper premolar smaller than 

 the second, but well developed ; third premolar very large, shaped 

 like a molar, with a broad internal basal process ; lower incisors 

 small, in the direction of the jaws ; lower canines very small ; 

 lower premolars well developed, nearly equal in size, the first 

 slightly smaller than the others. 



Length (of an adult <S), head and body l"-7, tail 1", free from 

 membrane 0""3, head 0"-65, ear 0"-5, tragus 0"'18, forearm l"-5, 

 thumb 0"-2 ; third finger — metacarp. l"-4, 1st ph. 0"-6, 2nd ph. 

 0"-25 ; fourth finger— metacarp. l"-4, 1st ph. 0"-38, 2nd ph. 0"-3 ; 

 fifth finger— metacarp. 1""2, 1st ph. 0"-4, 2nd ph. 0"'35 ; tibia 

 0"-7, calcaneum 0"-33, foot 0"-22. 



Hab. Brazil. 



* For figures and description of I he minute anatomy of these adhesiye diaks, 

 Bee my paper in P. Z. S. 1876, pp. 531-534. 



