Zoological Society. 529 



is now attached to the sesamoid bones of the elbow-joint, and to 

 the fossa on the inferior parts of the posterior surface of the os 

 humeri, 



" The anconeus arises from this muscle, and from the part of the 

 bone below the origin of the third head, and is attached to the sesa- 

 moid bones anterior to the triceps extensor cubiti. Instead of a biceps 

 and brachialis internus, there is a triceps flexor cubiti, the long head 

 of which arises, tendinous, from the antero-interior part of the su- 

 perior angle of the furculum, and, passing over the joint, is joined, 

 at the union of the upper with the middle third of the humerus, by 

 the fibres of the middle head, which arises fleshy from thejiirculum 

 immediately behind the foramen formed by the union of the three 

 bones of the shoulder passing on to join the long head ; at the head 

 of the humerus it is joined by the short head which arises from the 

 anterior part of the foramen ccecum ; when it reaches the superior 

 part of the middle third of the humerus, it joins the other tendons, 

 and then forms an aponeurosis over the elbow-joint, and is attached 

 to the middle part of the radius. A muscle arises from the anterior 

 superior edge immediately below the arterial groove on the lower 

 part of the humerus ; it passes directly downwards and is inserted 

 into the radial extremity of the metacarpal bone and into the edge 

 of the carpal ligament. The flexor communis arises from the inter- 

 nal side of the humerus, from the ligament of the elbow-joint, and 

 from the superior part of the radius and ulna ; it divides into two 

 tendons, which go down in the interosseal space, passing under the 

 ligamentum carpi annulare posterius, and are attached to the first and 

 each succeeding phalanx of the two fingers about 5 lines below their 

 articulations. The extensor communis has the same situation and 

 number of attachments on the external or dorsal side of the humerus. 

 There is a pronator quadratus arising as is usual in this class. There 

 is also a muscle which arises from the anterior part of the radius at 

 its distal extremity, and is inserted into the projection of bone 

 formed by the phalanx of the second finger, and also, by a slip, into 

 the internal part of the first phalanx of the first digit. 



" The muscles serving for the motion of the inferior extremity 

 may be described as follows. 



" The rectus arises by a fascia from the spinous processes of the 

 last three dorsal and two lumbar vertebrce, and muscular from the 

 lower half of the external part of the dorsum ilii and sacro-iliac sym- 

 physis ; and, passing over the neck of the thigh-bone, is inserted 

 into the lower edge of the groove on the anterior part of the patella. 

 The tensor vagineefemoris arises by a fascia from the sacral vertebra, 

 passes over the cotyloid cavity andtrochanter major, and turning to the 

 anterior part of the thigh is joined by another head which arises im- 

 mediately anterior to the cotyloid cavity ; after this union they are 

 inserted into the fascia of the thigh about halfway down. The glu- 

 teus medius at its origin occupies that part of the dorsum which ex- 

 tends between the origin of the acetabulum and the ridge situated in 

 the centre, and passes downwards and is inserted into the trochanter 

 minor and the ridge which joins it. The gluteus minimus arises from 



