650 



DK, P. CHALMEES MITCHELL ON THE 



[Dec. 17, 



middle head. Secondly, the special tendou from the raphe of the 

 caud-ilio-flexorius seen in the Ealline type (text-fig. 81, A. 1) is 

 absent in the Aramus type. 



Text-fig. 81. 



ffM-mi 



Text-fig. 82. 



Knee-muscles of Ballus longirostris. Knee-musoles of Aramus scalopaceus. 

 Musculature of knee ; right leg, internal view. 



FEM.-TIB.-I. Internal separate slip of femoi-o-tibialis (vastus internus). 



cc. Ijiganient from femur to tibia. 



P.I.F. Pub-ischio-femorales (adductors). 



C.I.L. Caud-ilio-flexorius (semi-tendinosus). G. I.L.I. Femoral insertion 

 of caud-ilio-flexorius (accessory semi-tendinosus). 



I.F. Iscbio-flexorius (semi-membranosus). 



A. 1. Anchor to tibia of C.I.L. 



A.2. Anchor to tibia of /.i''. 



Gc. 1. External femoral division of gaslrocuemius. 



Gc. 2. Intei'nal femoral division of gastrocnemius. 



Gc. S. Tibial division of gastrocnemius. 



SOL. Soleus. 



In text-figure 82 the caud-ilio-flexorius has had a piece i-emoved to 

 exhibit the deeper lying Gc. 2. 



The tendiuous areas are dotted. 



(3) Otis type. This (text-fig. 83) dili^ers from the Aramus type 

 first in that the femoral insertion of the caud-ilio-flexorius is much 

 narrower than, proximal to, and parallel with, the posterior femoral 

 head of the gasti'oenemius, so that there is no longer need of cutting 

 the former to display the latter (text-fig. 83, G.I.L. 1 & Ge. 2). Its 

 fibres meet the fibres of origin at a raphe as in the others, and the 

 ischio-flexorius fibres join the muscle-mass at the lower half of the 

 raphe. From this meeting-point a broad tendon {A. 2) runs to the 

 tibia, obviously corresponding to the normal insertion of the ischio- 

 fiexorius, while the muscular masses along with the posterior femoral 

 head of the gastrocnemius converge to a round tendon thai joiius 



