384 Mr. J. Wood Varieties in Human Myology. [June 15, 



longus and flexor digitorum profundus, as found in the apes and monkeys ; 

 with a curious addition of the nature of a tensor fasciae palmaris, forming 

 a close homologue with the plantaris flexor found in many of the lower 

 animals ; a double lumbricalis, as often seen in the apes j and a proper ex- 

 tensor of the middle finger. There is a redundancy of the extensor ossis 

 metacarpi pollicis and abductor pollicis, and an extensor brevis digitorum 

 on the back of the hand. This last curious muscle the author has now traced 

 in all stages of its segregation and posterior displacement from the fibres of 

 the dorsal interossei, which indicate strongly the light in which we should 

 view this muscle on the dorsum of the foot. (In the fore paw of the Sloth, 

 Professor Huxley has shown the author a similar displacement and use of 

 the dorsal interrossei as extensors of the digits, while the palmar, as in 

 most of the lower animals, fulfilled the part offlexores breves as well as 

 divaricators of the digits. This function in the Sloths is rendered neces- 

 sary by the imperfect development and abnormal displacement of the 

 tendons of the extensor lonaus.) Lastly, in the foot of this subject we 

 have the tibialis anticus and peroneus brevis muscles sending forwards 

 tendinous slips to their respective digits (first and fifth). A special abductor 

 of the metatarsal bone of the fifth digit, such as Professor Huxley and 

 Mr. Flower have shown to exist uniformly in the higher and lower apes, 

 and a double origin of the first plantar interosseus muscle, complete the 

 list of irregularities which render the above subject one of the most re- 

 markable the author has ever dissected. 



In a thin female subject of low stature was found, on the right side only, 

 the remarkable muscle given in fig. 4. It consisted of a roundish fusiform 

 slip (o) arising tendinous from the first cartilage below the subclavius close 

 to the manubrium sterni, passing across the subclavian vessels and nerves 

 quite distinct from the last-named muscle, and inserted into the upper 

 border of the scapula and suprascapular ligament, where it was connected, 

 to some extent, with the origin of the omo-hyoideus (c). From this point 

 of insertion another slip of muscular fibres passed forwards, upwards, and 

 outwards, to be inserted, with the subclavius, into the outer third of the 

 clavicle (b). 



This muscle seems to be the same as that given in the author's first 

 series under the name of a double subclavius, with the addition of a con- 

 necting slip to the clavicle. It seems to the author to represent pretty 

 closely the sterno-scapular muscle, while contributing to support the thorax 

 in the pachyderms and ruminants, in which animals it is continued as far 

 as the manubrium. 



In the same subject was a slip, on the left side only, arising from the 

 eighth rib, with the digitation of the serratus magnus, and inserted into 

 the short head of the biceps close to the coracoid process. A rather larger 

 muscle like this was described and figured in the first series, under the 

 name of a chondro-coracoid muscle. There was a third head of the biceps 

 on the left side, arising with the brachialis anticus, and on both sides 



