1868.] Mr. J. Wood on Variations in Human Myology. 507 



looked for, it has been found as a muscle and tendon, distinct from 

 the extensor carpi radialis longior, in 6 subjects ; viz. 5 mulesy in 3 in 

 both arms, and in 2 in the right arm only, and in 1 female ^ where it was 

 found in the left arm only. In Cuvier and Laurillard's plates of the dis- 

 section of the Common Seal (JPhoca vitulina, pi. 19), is figured a slip of 

 tendon from the single radial extensor of the carpus to the poUex-m eta- 

 carpal, sending off a slip to join the insertion of the extensor pollicis. 

 Humphry also describes the same slip as inserted simply into the pollex- 

 metacarpal in that animal (Journ. of Anat. and Phys. May 1868, p. 306). 

 In the great Anteater and Tamandua, Meckel describes a double or second 

 supinator longus, of which the tendon of one is inserted into the ensiform 

 bone and palmar fascia. This appears to be the homologue of the acces- 

 sorius. The author has also found its homologue in the Ornithorhynchus 

 and Echidna. 



25. Extensor carpi radialis intermedins. — The muscle and tendon de- 

 scribed by the author under this name, or its representative tendon 

 passing between the longior and brevior, have been found this session in no 

 less than 13 subjects. In the male (No. 11) and in the female (No. 22) 

 it was represented by a muscular belly distinct from those of the longior 

 and brevior, an arrangement which has been recorded by Albinus, Meckel, 

 and Theile. In the left arm of the former subject, the muscular slip left 

 the origin of the longior ; and the tendon, after crossing between that of the 

 longior and the radius, gave off a slip to the tendon of the brevior, and 

 was finally inserted into the index metacarpal inside the longior. It was 

 in the right arm of this subject that the radial extensors were blended, as 

 before described. In the males (Nos. 2, 5, & 16) and in the females (Nos. 

 27 & 34), intermediate tendinous slips came off from both the longior and 

 brevior (see fig. 7 h). A similar case is recorded by Bergman (Handschr. 

 Notiz.) and quoted by Henle. In Nos. 2 & 5 these slips simply joined 

 together to be inserted into the index metacarpal inside the longior. In 

 the right arms of Nos. 16 & 27, the slips crossed each other without join- 

 ing, to be inserted with the opposite longior and brevior tendons respec- 

 tively. In the right arm of No. 34, two slips from the longior and one 

 from the brevior united in a single tendon, which subdivided to be inserted 

 with the longior and brevior respectively, as in the Ruminants. In the 

 left arm of No. 27 the double shps united into one, which crossed under the 

 tendon of the brevior to be inserted into the middle metacarpal bone on its 

 inner or ulnar side. In four males (in Nos. 4 & 15 in both arms, and in 

 12 & 18 in the left arm only) and in two females (in the left arm of 

 Nos. 30 & 34) the slip passed from the longior above to the insertion of 

 the brevior below. This form of divergence has been recorded by Albinus 

 and Soemmerring. In another female (No. 23) the slip passed from the 

 brevior above to the longior below. 



Out of 102 subjects, viz. 68 males and 34 femaleSy the extensor carpi ra- 

 dialis intermedins has been found complete or incomplete in 32, 19 males 



