459 



slip inwards, 'which united with the short extensor tendon of the little 

 toe. In the leg of a thin subject, also a female, a second peronseal slip 

 arose from the outer side of the long extensor tendon of the little toe, 

 and was inserted in front of the normal peronseus tertius into the fifth 

 metatarsal bone, and likewise by a thin but strong expansion into the 

 base of the fourth metatarsal bone (peronseus quartus). 



19. The plantaris tendon in one instance terminated about the 

 middle third of the back of the leg by expanding into a flat aponeurotic 

 lamina, separating the solasus from the gastrocnemius, and terminating 

 by being continuous with the deep tibial fascia at the inner border of 

 the former muscle; the outer edge united with the conjoined tendons 

 of the muscles of the calf. The facility with which the plantaris 

 tendon can be unravelled and expanded is very striking, but I have 

 never seen a natural expansion of it except in this case : in another in- 

 stance this tendon, for the lower two -thirds of the leg, was inclosed in 

 a canal in the solseus tendon, from which, however, it was quite sepa- 

 rate. 



20. Prom the back of the lower extremity of the femur, about a 

 quarter of an inch external to the line leading from the inner condyle 

 to the linea aspera, there arose a round fleshy mass, more than an inch 

 above the inner head of gastrocnemius, which descended, crossing over 

 the poplitseal nerve, to be inserted by a short tendon into the outer 

 head of the gastrocnemius mnscle, near the point of its convergence 

 with the inner head (Plate IX., fig. 1, _/). If we are to recognise in 

 the gastrocnemial series of muscles the representatives of the conver- 

 gence of the pronator and supinator muscles of the upper limb, this 

 band might be the representative of the upper origin of the long supi- 

 nator. 



21. A composite special muscle to flex the little toe in the foot of a 

 slight female was made up of the following elements : — 1st, a muscular 

 band from the posterior part of the os calcis, below the sustentaculum, 

 and above and internal to the musculus accessorius ; secondly, a slip 

 from the cuboid and sheath of the peronseus longus ; and, thirdly, a 

 small thread from the long common flexor. These three parts united 

 to form a single tendon, which ran to be inserted without splitting into 

 the last phalanx of the little toe. A separate flexor brevis existed for 

 this toe in the third layer of muscles. 



22. In another female subject the outer slip of the musculus acces- 

 sorius detached a long flexor tendon for the little toe, which split the 

 fourth tendon of the flexor brevis, the latter being of extreme minute- 

 ness. Nearly the same arrangement was seen in another female, where 

 the outer part of the accessorius formed two tendons, one of which 

 united to the flexor digitorum longus, while the other passed to the 

 little toe direct, only receiving a slender thread from the last-named 

 muscle. 



I may here record the occurrence of sesamoid bones which I have 

 found in the heads of the gastrocnemius, in the peronseus longus (not 



