530 Mr. J. Wood on Variations in Human Myology. [May 23, 



represented by a small slip from tlie superficial surface of t\\e fiexor 

 carpi radialis. Mr. Macalister of Dublin has communicated to the 

 author the description of a complete specimen of this muscle inserted 

 into the base of the middle metacarpal bone. It existed in the right 

 arm only, and had its origin from the radius internal, instead of exter- 

 nal, to the flexor pollicis longus. He has also met with an instance of 

 an incomplete muscle of this kind inserted into the deep portion of the 

 annular ligament, also on the right arm. Kpalmaris laigus was present 

 in one of these cases, but not in the other. 



It is somewhat remakable that in these two cases, as in all the eight 

 cases observed by the author, this muscle has been found in the right 

 arm only. It offers the best homologue in the arm to the tibialis posti- 

 cus in the leg. 



15. Falmaris longus. — In three subjects (Nos. 5, 24, & 82) the normal 

 palmaris was absent in both arms. It was also wanting in the right 

 arm of No. 28, and in the left of No. 27. In three (5, 27, & 32) there 

 was a feeble slip of tendon from the superficial muscular fibres of the 

 flexor carpi radialis to the superficial surface of the middle portion of the 

 palmar fascia, which seemed to supply its place. This relation between 

 the two muscles is interesting in connection with the occurrence of a flexor 

 carpi radialis brevis in one of these subjects (32). In the left arm of 

 one subject (No. 28) both the tendon and muscular portions of the pal- 

 maris were doubled, the supernumerary one being smaller and placed 

 internal and posterior to the other, and arising with the condyloid 

 portion of the sublimis. Its tendon was spread out and lost on the 

 fascia at the wrist, a little above the annular ligament. In the right arm 

 of another (No. 34) the tendon of an otherwise normal palmaris was 

 doubled, both portions being inserted into the annular ligament and 

 palmar fascia. In a third (No. 8, the subject of fig. 4) the belly of this 

 muscle was inverted (Ji) and placed just above the wrist. 



16. JExtensores carpi radiales. — In no less than fifteen subjects these 

 muscles presented the intervening muscle and tendon, named by the 

 author the extensor carpi radialis intermedius. In six this muscle arose 

 fleshy with the longior, and was inserted by a long tendon with, but 

 distinct from, the hrevior into the base of the third metacarpal bone. 

 In four it arose with the belly of the hrevior, and its tendon was di- 

 stinctly inserted with that of the longior into the second metacarpal. In 

 one subject it was arranged in the first way on the left arm, and in the 

 second on the right ; while in the remaining four it was double, e. g. 

 there were two additional muscular bellies intervening between the 

 longior and brevier, with long tendons crossing in exchange in opposite 

 directions. In one, these tendons were united and more or less blended 

 as they crossed each other. Such an arrangement has been recorded 

 by Macalister {op. cit. p. 13). In another (No. 26) the left arm was 

 provided with a single-bellied intermedius with tv/o tendons, one going 



