436 



General Notes. [October 



certainly not the one so named in human anatomy, which passes from the 

 entocondyle to the carpal sesamoid (pisiform) and so on to the fifth 

 metacarpal. But I think there has been a slip here, the muscle in ques- 

 tion really going to the manus for insertion. If so, it is correctly named 

 and identified as \.\\t. Jiexor {meta-)carfi ulnaris (see ' Key,' fig. 89, no. 

 36), or %\m\<i\y flexor ulnaris oi C- and S. 



2. ' Musculus ulni-metacarpalis ventralis.' 



3. ' Musculus ulni-metacarpalis dorsalis.' 



These two muscles I cannot at present writing bring into satisfactory 

 positions in my system. They both appear to belong to the /fe;vor set ; 

 but as there is neither flexion nor extension in a bird's wrist-joint (motions 

 of adduction and abduction being substituted), one cannot proceed too 

 carefully in identifying the muscles by their action. I see nothing ulno- 

 metacarpal in man to which to refer these muscles. They may turn out 

 to belong to two different groups, despite their concurrent action, and I 

 do not venture to rename them at present. 



4. ' Extensor metacarpi radialis.' This appears to correspond to both 

 the radial wrist-extensors of anthropotomy, the 'longior' and 'brevior,' and 

 the supinator longus may also be in question here. It is the muscle call- 

 ed (in the 'Key,' fig. 89, no. 32), after Cams, extensor metacarpi longus. 



5. ' Extensor metacarpi ulnaris.' No doubt the muscle so called in 

 man, and that called extensor metacarpi brevis in the Carus figure, 'Key,' 

 No. 11- 



6,7. ' Flexor digitorum sublimis ' and ' profundus.' These correspond 

 to the muscles of the same name in man, also cMed flexor perforatus 

 and ferforans respectively. 



8. ' Extensor digitorum communis.' This is said, by a slip, to originate 

 on the 'head' of the humerus, condyle being obviously meant. It is the 

 muscle of the same name in man. It appears to be wrongly named in 

 the Key, "34« flexor digitorum sublimis," after Carus. 



9. ' Extensor pollicis longus.' This may or may not correspond to 

 one, or to two, or to all three of the thumb-extensors of man. That 

 depends, first, upon whether the so-called thumb of a bird's hand be the 

 first or the second digit, and next, upon how many of the human muscles 

 are represented in or by the single one of the bird. This thumb muscle I 

 do not recognize in the figure in the ' Key.' 



10. 'Extensor indicis longus.' The final determination of this muscle 

 depends upon the same considerations that affect the recognition of No. 9. 

 In the 'Key' figure, it appears to be that one called " 34*5 flexor* digitorum 

 profundus." 



11. ' Musculus interosseus dorsalis.' This is one of the muscles called 

 dorsossei by C and S. As it appears to be the only metacarpal dorsosseus, 



*As long ago as 1871 I had an idea that the 'flexors' and ' extensors ' of the forearm 

 required to be revised in name to bring them into correspondence with their 

 apparent representatives in the leg, and I used frequently to exploit the notion. This 

 accounts for the use of 'flexor' in the cases of numbers 8 and 10. 



