Knott — On Muscular Anomalies. 633 



site the tuberosity of the ischium) to the central tendinous point of 

 the perinseum, I have twice observed. It is a variety of transversalis 

 perinai superficialis. 



Levator urethrce. ; pubo-urethralis ; Wilson'' s muscle. — This muscle is 

 now properly regarded as formed by the anterior fasciculus of the 

 levator ani muscle. It is a small band (usually about 1 mm. in 

 breadth), which arises about 1 cm. outside the margin of the symphysis 

 pubis, and about the middle of its level, and passes downwards and 

 backwards to the central tendinous point of the perinseum. It was 

 absent five times in thirty subjects examined, the deficiency being 

 bilateral in all cases. 



Psoas magnus. — This muscle was examined on both sides in forty 

 subjects. Some variations of origin were observed. In three instances 

 some fibres took origin from the neck of the last rib ; this peculiarity 

 was symmetrical in two of the cases. Fibres of origin came from the 

 lateral margin of the right crus of the diaphragm in one of these, and 

 I have notes of three other cases in which the same was observed. 

 An origin from the left crus I have once met with. 



The origin from the last lumbar vertebra was deficient in five 

 bodies. In three this occurred on both sides ; in the other two it was 

 unilateral, the deficiency being on the left side in both cases. 



Psoas parvus. — This muscle was present in seven of the forty 

 subjects. In five of these it was bilateral ; in the other two on the 

 right side only. The origin in all cases was as described in the ordi- 

 nary text-books. 



A case of psoas parvus having the usual origin, but inserted into 

 the side of the cartilage between the third and fourth lumbar ver- 

 tebrae, has been already published by me in these Proceedings. 



Sartor ius. — A case of insertion into the inner side of the capsule 

 of the knee-joint has been already recorded. A well-marked separa- 

 tion between the spinous origin of this muscle and that from the 

 interspinous notch I have four times noted. In three cases the chink 

 transmitted a considerable branch from the ascending division of the 

 external circumflex artery. 



Quadriceps extensor cruris ; rectus (exfernus) femoris. — Slight varia- 

 tions in the tendons of origin or insertion of this muscle are not 

 unfrequent. In forty specimens, carefully examined, three presented 

 direct continuity of the acetabular and spinous heads of origin. In 

 one case, a small accessory tendinous slip came from the anterior 

 superior spine ; in two there was a division of the spinous origin of 

 the muscle into two parts, separated by a thin layer of areolar 

 tissue. 



In one of the cases enumerated above, and in three others which I 

 have from time to time observed, the tendon of insertion was covered 

 in front, by the overlapping of the vasti tendons, which, with the 

 cruraeus, formed a canal, through which the former tendon passed to 

 the patella. 



Vasti muscles ; crurceiis. — The variations of these muscles were 



