455 



rib, lying superficial and internal to the great pectoral ; on other occa- 

 sions it passed outwards as far as the cartilage of the eighth rib. The 

 former case seemed to be an attempt at a rectus sternalis. 



6. The sartorius muscle I have seen extending at its origin along 

 Poupart's ligament for a short distance from the anterior superior spine 

 of the ilium, and by its deep-seated surface united to some of the su- 

 perficial fibres of the iliacus internus. 



7. My friend and former pupil, Dr. Raye, has furnished me with a 

 note of an interesting variety, which he had found occurring in the 

 case of the subclavius muscle. It is well known that not very un- 

 commonly this muscle is continued outwards beyond the clavicle to the 

 acromion process of the scapula; but in this instance, " on the left side 

 the muscle was not inserted into the clavicle at all, but, passing free 

 from that bone, was attached to the ligament of the notch, and to a 

 small portion of the outer extremity of the superior costa of the scapula 

 external to it. The omo-hyoid arose more internally from the superior 

 costa, its usual position being occupied by the subclavius. The supra- 

 scapular artery separated these muscles. The subject was a female, 

 and the same anomaly occured on the right side." Mr. Wood, in de- 

 scribing a similar irregularity, mentions that it coexisted with a normal 

 subclavius ; and consequently he regards it as a distinct muscle. In his 

 subject, likewise, it was united at its insertion to the omo-hyoid; so in 

 both these respects the instance recorded by him differs from the case 

 given above. Mr. Wood regards it, and with sufficient reason, to be 

 the representative of the Mammalian sterno-scapular muscle, which I 

 have found in many Mammals taking a similar course. In a porcupine 

 which I lately dissected this muscle closely resembled our anomaly, 

 except that, crossing over close tc the superior costa, it was inserted 

 into the posterior two-thirds of the spine of the scapula. A similar 

 arrangement I have found in a pig. 



8. The occurrence of additional heads to the biceps flexor cubiti 

 has long been familiar to anatomists, and is among the best known of 

 muscular anomalies, having been described by Struthers, Meckel, 

 Theile, Kelch, and others. I have not in my dissections verified 

 Theile's experience that this variation occurs once in every eight or 

 nine subjects, as out of forty subjects taken at random through the last 

 session I noticed its presence only in two ; and from my previous ex- 

 perience of its occurrence I would be inclined to state its frequency as 

 being about once in twenty-five cases. 



Among the different forms of this variety, the following are the 

 principal : — (1). The most common consists of a slip from the bra- 

 chialis anticus, interesting as the representative of the short head of the 

 biceps flexor cruris ; (2), sometimes a similar head may come from the 

 supinator longus ; (3), from the pronator teres ; or, more, rarely 

 (4), I have seen a band arising from the humerus, inseparable from the 

 insertion of the coraco- brachial, and uniting with the biceps at the 

 middle third of the arm; (5) the accessory origin may be, as described 

 by Meckel, from the greater tuberosity of the humerus ; (6), or, asde- 



