240 Mr. J. Wood on Variations in Human Myology. [June 21, 



24. The extensor longus primi internodii hallucis, described in the 

 author's first paper, was found in no lees than ten out of the thirty -four 

 subjects, in all, except one, in both legs. In seven the muscles and tendons 

 were fully developed and distinct from the fibres of the extensor proprius 

 hallucis, generally arising above, but sometimes below this muscle. In 

 the remaining three (Nos. 11, 19, and 21) the abnormal muscle was repre- 

 sented by a tendon given from the extensor proprius near the ankle. In 

 subject 21 this tendon was also, on the right side, contributed to by one 

 from the extensor longus digitorum. In all the tendon was attached to the 

 base of the first phalanx of the great toe, close to the joint, either distinct 

 from or in union with that from the extensor hrevis digitorum pedis. 



25. Flexor longus accessorius.- — The high origin of this muscle, by an 

 additional head from the lower third of the fibula, or from the fascia 

 covering the jiexor longus hallucis, has been observed in three cases. 

 In all it was provided with a distinct tendon, which joined separately 

 in the union of the long flexor tendons in the middle of the sole. In 

 subject 26 the jiexor accessorius was made up of four distinct heads. 

 1 . The long head as above described ; 2, another tapering fleshy belly 

 from the upper part of the os calcis and insertion of the plantaris ten- 

 don, in front of the tendo AchilHs, and ending in a distinct tendon; 

 3, the usual " massa carnea'' from the hollow surface of the os calcis ; 

 and 4, the outer tendinous slip from the long plantar ligament. These 

 all uniting, joined with a large slip from the tendon of the Jiexor longus 

 poUicis, to form a distinct deep or third set of flexor tendons passing to 

 the four outer toes. Each of these joined that of the perforans in the in- 

 side of the sheath, about the first joint. 



26. Ahductor ossis metatarsi quinti,- — This muscle, as described and 

 figured by the author in former papers, was found only in seven subjects 

 this session, in all in both feet. This is much less than the proportion 

 found last session. In two out of the five females dissected, they were 

 found well developed, of a fusiform shape, arising from the outer tubercle 

 of the OS calcis, and inserted by a distinct rounded tendon into the 

 base of the fifth metacarpal bone. In five males only, out of the twenty- 

 nine dissected, were they found as muscles distinct from the fibres of the 

 ahductor minimi digiti. 



In the previous session the proportion of female subjects to males was 

 very much greater than in the last. The specimens of this muscle found 

 were also much more numerous, so much so as to be estimated by the 

 author at nearly half the number of subjects. "Whether this remarkable 

 difference depends upon the sex, or is accidental, must be decided by future 

 observations. 



27. In the miscellaneous column we have nine single specimens, as com- 

 pared with eleven or twelve in the arms, and six or seven in the head 

 and neck. 



In a female (31) was an areolar separation of the front fibres of the 



