445 
C. J. Sundevall on the Wings of Birds. 
The ext. carpi ulnaris is half united with the humero-ulnaris 
externus, which extends to f-. 
The supinator strong, to f. 
The flexors nearly as in the Waders &c., but the sinew of 
the flexor digit, profundus gives oft a branch to the thumb, 
instead of the ext. digit . comm. 
The pronator is single, to §. 
The biceps has only the caput longum. 
The deltoideus also arises from the clavicle, and therefore 
more resembles that of the Mammalia; it terminates at § of 
the humerus. 
The tensor plicae cutaneae and rector remigum occur, not¬ 
withstanding the undeveloped state of the wing. 
Aptenodytes, next to the Ostriches, is the most aberrant of 
all known forms of birds, and therefore the following abstract, 
also from Schopss’s description, may be of interest in this 
place. The wing is perfectly formed, as in birds, and only 
in its external form and strong compression has it some re¬ 
semblance to the pectoral fin of a whale, shark, &c. 
The extensores carpi radiates longus et brevis are nearly as 
usual, the latter not small. 
The extensor digitorum communis gives off at the carpus a 
branch to the extensor indicis proprius. 
Of the extensor carpi ulnaris there remains only a rudiment 
of sinew-fibres. 
The humero-ulnaris externus is small. 
The supinator to ^ ; as in Alca , only on the outer side of 
the radius. 
Of the two pronatores only sinewy rudiments. 
The flexor carpi ulnaris seems to consist only of a sinew 
(perhaps the fascia ulnaris ?), and the rector remigum is 
wanting. On the other hand the flexor digitorum sublimis 
commences from the condyle,and its sinew terminates on the 
second phalange. 
The flexor digitorum profundus is not small; also from the 
radius. 
The flexor carpi radialis consists only of a few sinewy fibres, 
as also the flexor and extensor ulnares. 
