Knott — On Muscular Anomalies. 637 



the muscles of tlie calf, sometimes occurs, and has been described 

 under this name. I have observed such a slip in two cases ; in one it 

 was bilaterally developed. 



Tibialis anticus. — The origin of this muscle rarely presents any 

 considerable variety. I have twice observed an accessory bundle of 

 muscular fibres from the head of the fibula. The insertion is not so 

 constant. Of thirty cases examined, two sent each a slip to the liga- 

 mentum cruciatum ; in two others a slip was sent to the inner side of 

 the head of the first metatarsal bone : one was found to send a process 

 to the base of the first phalanx of the great toe. The slip to the liga- 

 mentum cruciatum is present, according to Professor W. Krause, in six 

 per cent, of the cases examined. 



Tihio-fascialis anticus (Wood) ; tibialis anticus accessorius (s. pro- 

 ftmdus) ; tensor fasciae dor sails pedis (W. Krause). — Of this muscular 

 slip I have met with two examples in forty cases consecutively noted. 

 It was in each case united to the tibialis anticus at its origin, and the 

 insertion was partly into the annular ligament and partly into the 

 deep fascia on the dorsum of the foot. 



Extensor proprius Jiallucis. — The only variety of this muscle which 

 I have noted was a slip from its tendon to the innermost tendon of the 

 extensor brevis digitorum. This I have observed in four instances. 



Extensor digitorum longus. — The tendons of this muscle were 

 specially examined in thirty cases. Two of these presented a slip to 

 the innermost tendon of extensor brevis digitorum, which proceeded 

 with it to the base of first phalanx of great toe. Two others sent slips 

 to base of first phalanx of second toe. In one case a well-marked slip 

 passed from the outermost tendon to the dorsum of the fifth metatarsal 

 bone about its middle. Two sent slips to the base of this bone. In 

 another case two slips were sent from the third and fourth tendons to 

 the bases of the fourth and fifth metatarsal bones respectively. 



Extensor Jiallucis longus accessorius (s. minor) ; extensor primi inter- 

 nodii hallucis. — This muscle is of very frequent occurrence, so that it 

 is regarded by some observers as a normal structure. It was found 

 by Professor Wood in nearly half the subjects which he examined, 

 and other observers have recorded a proportional frequency of as much 

 as eighty per cent. I have found a muscular slip, more or less com- 

 pletely continous at its origin with the lower part of the extensor 

 proprius pollicis, and proceeding to the base of the first metatarsal 

 bone — in sixteen cases of forty in which it was specially searched for. 

 In four cases a slip having the same insertion came from the tendon of 

 proprius pollicis, and in one from the innermost tendon of longus 

 digitorum. 



Feronceus longus. — This muscle I have found inseparably adherent to 

 the brevis in three instances. In two cases I observed a tendinous slip 

 to the base of the fifth metatarsal bone, to which it adhered, even below 

 aud behind the tendon of insertion of the peronseus brevis. In another 

 case a slip passed forward to the under surface of the head of the first 

 metatarsal bone. Expansions from the tendon to the bases of the third 



