1868.] Mr. J.Wood on Va?nations in Human Myology. 519 



Nearly the same arrangement was found in both legs of a male last year, 

 making a proportion of 3 in 70 subjects. It was found, according to 

 Meckel, in the Sloths and Reptiles. 



In the female (No. 33) a slip was given from the second tendon of the 

 extensor longus to that of the extensor brevis, as found in a male in last 

 year's series. This was noticed by Macwhinnie {op. cit. p. 195) joining 

 the great-toe tendon of the brevis. 



48. Peroneus tertius. — In 15 subjects, viz. 8 males and 7 females, this 

 muscle presented abnormalities of various kinds. The most conspicuous 

 was its entire absence in the right leg of one male (No. 8) and two females 

 (Nos. 21 & 23). In the left leg of the male its tendon was very small, and 

 was lost upon the fourth interosseous fascia and muscle, not reaching the 

 metatarsus. 



Out of 68 males this muscle has been found to be absent in 5, and out 

 of 34 females in 5 also, giving a proportionate frequency of deficiency 

 exactly double in the females. In the 5 males it was wanting in 1 on 

 both sides, in 3 in the right, and in I in the left leg only. In the 

 5 females it was wanting in 1 on both sides, in 3 in the right, and in 

 1 in the left leg only. It would thus seem to be absent most frequently 

 in the right leg. In the only instance in which the left leg only is 

 recorded, the representative in the right leg was a mere slip from the 

 extensor- communis-digitorum tendon, which could scarcely be called a 

 peroneus. This muscle is uniformly absent in the Quadrumana and all 

 the lower animals, and appears to subserve especially the erect position 

 peculiar, among mammals, to the human subject. 



In both legs of the male (No. 1) and in the right leg of the female 

 (No. 35) the tendon of the peroneus tertius gave oif slips of reinforcement 

 to the outermost tendon of the extensor longus digitorum^ in front of the 

 ankle. In both legs of No. 16 a similar slip joined that of the extensor 

 brevis. In 5 males and 4 females it was provided with two tendons or 

 split. In both legs of No. 4, and in the right leg of Nos. 5 & 9 (males), 

 both the tendons were inserted separately into the fifth metatarsal bone, 

 one close to its base, and the other about its middle. In the right leg of 

 Nos. 7 & 9 (males), and No. 27 (female), in the left leg of No. 8 (male), 

 and in both legs of No. 29 (female), one of the double tendons, or a slip 

 from a single tendon, passed forward to join the fourth interosseous fascia 

 or muscle. In both legs of No. 18 (male), and in the left of No. 19 

 (female), the tendon of the peroneus tertius was implanted wholly upon 

 the fourth instead of the metatarsal bone ; and in both legs of No. 34 

 (female) it was mainly inserted into the fourth, giving off a slip only to 

 the fifth. 



Altogether in 102 subjects these varieties of redundancy were found to 

 be half as many again in males as in females, contrasting widely with the 

 greater frequency of deficiency in females before described. 



49. Peroneus brevis. — In the male (No. 3) the posterior fibres of this 



