MTOLOGT OE ANOMALTJRTJS. 



325 



morpMne rodents, but it is seldom such a distinct muscle as 

 to be unmistakable. 



Nothing worthy of special remark was seen in the examination 

 of the short rotator muscles of the hip. 



The Biceps femoris {Flexor cruris lateralis) has only one head, 

 and that from the tuberosity of the ischium (fig. 4). It is 

 inserted into the fascia of the upper third of the leg. In most 

 rodents a superficial head from the spines of the anterior caudal 

 vertebrae is also present, but in Sciurus and Pteromys no head 

 from this origin was found. 



The Tenuissimus (Bicipiti aceessorius) rises from the sacral 

 vetebrse deep to the ecto-gluteus and runs down to be inserted 

 with the posterior fibres of the biceps (fig. 3). 



The Semitendinosus, as is usual in rodents, rises by two heads, 



Fig. 4. 



Deep Muscles of Thigh. 

 The I'eferences in this figure explain themselves. 



one from the anterior caudal vertebrae, the other from the tuber 

 ischii ; these join in the upper third of the thigh, and are inserted 

 into the junction of the upper and middle thirds of the internal 

 surface of the tibia. 



