64 Prof. A. Macalister on the Myology 



low this Lone. The psoas parvus is present, but small. 

 Some such continuation of the psoadiliac insertion seems to 

 occur in the Orycterope. 



Sartorius is a large Hat muscle, and it arises from the ante- 

 rior superior spine of the ilium and from the outer half of 

 Poupart's lig-ament; of these origins the latter is the most 

 important. Its fibres run downwards and inwards to be in- 

 serted into the inner side of the head of the tibia. This muscle 

 includes the slip called by Cuvier " pubio-prctibien," or the 

 rectus internus ; the outer band is inserted into the femur, not 

 the tibia. The origin ascribed to this muscle by Meckel (from 

 the external oblique aponeurosis) will thus be seen to be quite 

 accurate, despite the animadversions of the editor of Cuvier's 

 '■ Lecons orales.' This occurs in the Hare and Rabbit, as 

 Krause very accurately describes. The sartorius is thus being- 

 moved inwards in this animal ; and its displacement is com- 

 pleted in the Armadillo and Orycterope, in which the origin 

 is distinctly internal to its usual site. 



Pectineus muscle is composed of two parts, arising from the 

 pectineal ridge on the os innominatum, and inserted into the 

 femur for its entire length ; the long superficial portion passes 

 internal and nearly parallel to the sartorius, while the deeper 

 part seems the true pectineus. This division is noticed by 

 Cuvier, and seems likewise to occur in the Orycterope (Galton, 

 Trans. Linn. Soc. p. 591). Gracilis is a continuation inwards of 

 this same muscular stratum, and, arising from the pubic ramus 

 and symphysis, passes downwards and inwards to be inserted 

 into the inner condyle of the tibia. 



Biceps femoralis is composed of two parts. One, the long- 

 head, arises from the tuber iscliii and its ascending ramus and 

 descending ramus of the pubis ; it overlaps the adductors, and 

 is separated from the femoral head by the great sciatic nerve. 

 The femoral origin arises from the upper half of the back of 

 the femur, on its outer side, and soon miites with the long head 

 to be inserted into the head of the fibula. In the Armadillo 

 there is no femoral head, nor in the Orycterope ; but in the 

 Tamandua and Two-toed Anteater this muscle has a true fe- 

 moral head. 



Semimembranosus and semitendinosus arise by a common 

 tendon from the tuber ischii, and continue fused together for a 

 short distance from their origin. They descend the thigh 

 together, and are inserted into the tibia as usual, the semi- 

 membranosus passing to the upper })art of the inner condyle 

 and fascia of the leg *. 



* By accident the notes on the addur-tor niusidcs have been lo/tt ; sj I 

 prefer leaving- them delicient lu lilling- I lie gap iVoui ni,'mory. 



