302 Mr. J. Wood on some Varieties in Human Myology. [June 16, 



the dorsal interossei, arising from the base of the metacarpal, os magnum 

 and unciforme, and attached to the common expansion of the extensor 

 tendons behind the sHps from the interossei. These slips are considered 

 bv the author to indicate a tendency to the formation of an extensor brevis 

 digitorum manus, by posterior displacement of the fibres of the dorsal 

 interossei, 



21. A. Musculus intei'osseus volaris prirmis. — A palmar interosseous 

 going to the dorsal aponeurosis of the thumb. Not usually described, 

 though often present. Mentioned by Henle. 



B. In a hand from the subject before given in 9 and 1 7, all the dorsal 

 interossei were arranged in two portions easily separable. In the first 

 interosseous space the abductor indicts was very distinctly divided into a 

 posterior part, arising in the usual manner, and inserted into the base of 

 the first phalanx ; and an anterior, arising from the first metacarpal, and 

 inserted partly (by a small slip) into the second metacarpal, but chiefly 

 (by a very distinct tendon) into the dorsal expansion of the common exten- 

 sor tendon of the index. Not before recorded in the human subject. A 

 similar arrangement found in the Gorilla and other Simiee. 



22. Strong muscular slips seen in the male perineum, arising from the 

 usual attachment of the transversi perinei to the ischial tuberosity, and 

 inserted with the front fibres of the accelerator urince into the dorsal fascia 

 of the penis and corpora cavernosa, in front of the erector penis. Not 

 before recorded. 



23. Separation of the anterior fibres of the gluteus minimus into a dis- 

 tinct muscle homologous with the scansorius of Traill, or invertor femoris 

 of Owen, found in the Orang and others of the Ape-tribe. 



24. Tensor fascice plantaris. — Arising from the oblique line of the tibia 

 under the soleus, and inserted into the internal annular ligament, near the 

 tuberosity of the os calcis. 



25. Flexor accessorius longus digitorum. — Fleshy from the aponeurosis 

 halfway up the back of the leg, with a tendon joining the flexor accessorius 

 and tendon of the flexor longus digitorum. 



The superficial flexor tendon of the little toe was also, in the same foot, 

 supplied from the outer fibres of the flexor accessorius. Not before recorded. 



26. Peroneus quinti digiti. — In most instances a tendinous, but in one 

 a fleshy offset from the peroneus brevis, below the outer ankle-bone, to 

 the expansion of the common extensor tendon of the little toe. Very fre- 

 quent in the human subject, usual in the Apes. 



27. Tensor fasciae dorsalis pedis, from the lower third of fibula to the 

 anterior annular ligament and dorsal fascia. Not before recorded. 



28. Tibialis anticus tendon divided into three parts, going respectively 

 to the inner cuneiform, base of metatarsal, and first phalangeal bone of the 

 great toe. The last-mentioned off'set not before recorded. Similar arrange- 

 ment in the Quadrumana. 



29. Extensor primi internodii hallucis, or proper extensor of the first 



