Knott — On Muscular Anomalies. 641 



is present in about sixty per cent, of the subjects examined by me. 

 "W. Krause regards its occurrence as normal ; the frequency of its 

 absence, which varies from twenty-five to fifty per cent., being greater 

 in the female. When this accessory slip has a distinct origin from the 

 calcaneum, it forms an — 



Abductor ossis metatarsi minimi cligiti. — This muscle I have found, 

 distinct enough to merit a separate description, three times in forty 

 cases. I have also noted its occurrence in a good many other in- 

 stances. 



Flexor digitorum accessorius ; quadratus plantm. Massa cornea 

 iTacoii Sylvii. — In four cases I have noted fibres of insertion going to 

 the tendon of the flexor hallucis longus. In two of these, fibres were 

 also attached to the connecting slip given by the tendon of the flexor 

 hallucis to that of the brevis digitorum. The origin I have, in several 

 cases, found to reach to the upper .surface of the os calcis, and once I 

 found some fibres arising from the anterior surface of tendo Achillis. 



Lumbricales. — The only noteworthy peculiarity of this muscle 

 which I have met with are the variations in number, which are not 

 infrequent. The first (internal) muscle is that which I oftenest 

 missed. I have noted its absence six times, but without taking any 

 account of the relative frequency of the occurrence. I do not remem- 

 ber having observed absence of the third or fourth. 



Adductor poUicis. — A slip to the base of the first phalanx of great 

 toe I have twice noticed. It came, in each case, from the inner por- 

 tion of the muscle {caput olliquum), and was of considerable size. 

 Professor Krause describes, as a normal arrangement, the adhesion of 

 the transversus pedis to this muscle, giving to the portion formed by 

 the latter muscle the name of caput transversum. 



Opponens hallucis. — A fleshy segment sometimes separates itself 

 from the inner part of the adductor poUicis, and is inserted into the 

 outer border of the os metatarsi halhicis. Some anatomists have 

 erroneously regarded this slip as the homologue of the opponens 

 hallucis. 



Transversus pedis ; transversalis pedis ; transversus (s. transversalis) 

 plantce ; adductor transversus hallucis ; alducteur transverse. — The 

 attachment of this muscle to the heads of the third and fourth meta- 

 tarsal bones I have frequently found absent (five times in thirty-four 

 cases). The whole muscle was absent in another of the number, and 

 I have noted three other instances of its deficiency. 



