1868.] Mr. J.Wood on Variations in Human Myology, 523 



the left leg of No. 29 a considerable muscular slip passed from the origin 

 of the pectineus muscle across the deep femoral artery to join the fibres of 

 insertion of the adductor longus. This shp was noted in two subjects in 

 last year's series. It is also mentioned by Macwhinnie {op. cit. p. 194), 

 and is found in some of the Quadrumana, Carnivora, and Rodents. 



In the right leg of the female (No. 33) was found a complete specimen 

 of ih^ flexor accessorius digit orum longus pedis, arising by a single penni- 

 form belly from the lower third of the outer border of the fibula and the 

 posttibial fascia, and ending in a tendon which joined that of the flexor 

 digitorum longus at the point where the normal " massa carnea Sylvii " 

 was connected with it. 



This abnormal muscle has been found in 4 male subjects out of 68, 

 and in 1 female out of 34. In all it arose from the lower third of the 

 fibula and the fascia covering the flexor longus hallucis. In 3 of the 

 males it was found in both legs. In the fourth male and in the female it 

 was found in the right leg only. 



On reviewing the foregoing 18 males and 18 females with reference to 

 the Table, it will be seen, as might be expected, that the greatest absolute 

 number of abnormalities in the vertical columns (reckoning both sides as 

 one) is found in those muscles the variations of which have been hitherto 

 best known to anatomists. These have been noted to ascertain simply 

 their exact frequency. 



Of supernumerary tendons of the extensor minimi digiti and extensor 

 ossis metacarpi pollicis there are 33 instances — 1 only of the males and 

 2 of the females, and these latter in the same individuals presenting the 

 single insertion described in most anatomical manuals. The coronoid 

 origin of the flexor pollicis longus is seen in 27 subjects, only 5 males 

 and 4 females not possessing it. Slips of junction with the flexor pro- 

 fundus digitorum were found in 3 subjects. The extensor primi inter- 

 nodii hallucis longus is found in 29 subjects, only 2 males and 5 females 

 not possessing it. The peroneus quinti tendon is found in 20 subjects, 

 10 in each sex. Next comes the abductor ossis metatarsi quinti in 19 

 subjects, 1 1 of which are males — a much larger proportion in that sex than 

 was found in last year's series. The extensor carpi radialis brevior and 

 primi internodii pollicis each give 18 abnormalities, 9 of which in the latter 

 muscle were instances either of partial amalgamation or total absence, 4 in 

 males and 5 in females. The peroneus tertius presents abnormalities in 

 15 subjects, 2 of which are instances of total deficiency, and both of them 

 in females. This is curious when compared with the greater frequency of 

 absence in the same sex of the extensor primi internodii pollicis. Both 

 these muscles are eminently human muscles, and are never found even in 

 the highest of the Simiadce. The absence of the two muscles does not, 

 however, seem to be correlated ; it is not found in the same individual in 

 any of the cases. The cleido-occipital, palmaris longus, and flexor profun- 

 dus digitorum come next in frequency, each in 14 subjects, and nearly 



