Knott — On Abnormalities in Human Myology. 425 



occurred twice in thirty -four subjects, and I have seen several other 

 examples. The bilaminar form described by Meckel and Macalister 

 occurred once. Once the muscle almost formed a triangle, the trun- 

 cated apex of which was formed by the radial end. 



Ciilito-carpeus. — This rare muscle arises from lower end of ulna, 

 where it is in close cotitact with the pronator quadratus, form- 

 ing, in fact, a detached portion of the latter ; and it passes inwards to 

 be inserted into the tuberosity of the s&aphoid bone and base of the 

 first metacarpal. It nearly corresponds to the ulno-carimlis singularis 

 anterior of Gruber ; but the latter is large at its ulnar attachment as 

 the normal pronator, and is wholly inserted into the carpus. 



Tensor ligamenti annularis (v. orhicularis) dorsalis (v. posterior). — 

 Arising from the ulna behind the lesser sigmoid cavity, it is inserted 

 into the posterior surface of the orbicular ligament of the radius. I 

 found it as a distinct slip six times in thirty-four subjects. According 

 to Macalister, its proportional frequency as a separate muscle is twenty- 

 five per cent, of subjects examined; according to Gruber it has been 

 found in seventy-four per cent, of fore-arms. 



Tensor ligamenti annularis (v. orlicularis) volaris (v. anterior). — 

 Arises from the coronoid process of the ulna, and is inserted into the 

 anterior surface of the orbicular ligament of the radius. It is much 

 less frequently seen than the other : it occurred in my cases twice in 

 thirty -four subjects: according to Krause, the average frequency of its 

 occurrence is seven per cent. 



Supinator radii hrevis accessorius. — Is a small slip from the brachialis 

 anticus, going to the tubercle of the radius. I have seen two specimens. 



Extensor carpi radialis longior; Irevior. — These muscles I have found 

 completely inseparable five times in thirty -four bodies. In one of the 

 cases three tendons were given off — one to the second metacarpal bone, 

 two to the third. In another instance a normal longior sent an acces- 

 sory tendon to accompany that of brevior. Brevier had a double in- 

 sertion in two of the fore-arms into second and third metacarpal bones. 



Extensor communis digitorum. — Absence of the little finger tendon 

 occurred in three of the subjects already referred to. Doubling of one 

 or more of the tendons occurred in a large proportion of cases, but I 

 made no note of the exact number. 



Extensor minimi digiti. — This was completely absent in one instance. 

 In two other cases there was a double tendon : in one of these the two 

 slips were inserted together ; in the other the second tendon went to 

 the metacarpal bone of the ring finger. In one case the muscle was 

 double, the second part forming the extensor minimi digiti accessorius 

 (Krause). 



Extensor hrevis digitorum manus. — A rudimentary muscle, which is 

 found in various forms of development on the back of the hand. The 

 proportion of cases in which it occurs is, according to Krause, from 

 three to seven per cent. It arises most frequently from the posterior 

 annular ligament (Krause) ; sometimes from the end of the radius 

 ( Albinus, Humphry) ; from the bases of one or more of the metacarpal 



