1889.] 



ANATOMY OF PICARIAN BIRDS. 



591 



common with the innermost head of the gastrocnemius. The semi- 

 tendinosus is attached by a thin tendon to the tibia as in Aceros and 

 by a short tendon, also as iu that sjiecies, to the gastrocnemius. The 

 accessory semitendinosiis arises chiefly from this latter tendon, but 

 there is no division between this part of the muscle and that which 

 takes its origin from the fleshy part of the semitendinosus. 



Fig. 3. 



Leg-muscles of Aceros nvpalensis. 



add, Adductor longus ; Ast, accessory semitendinosus ; St, semitendinosus ; 

 gaat, gastrocnemius ; Sm, semimembranosus. 



In Buceros atratus there is again some little difference from both 

 the types already described, although the resemblances are on the 

 whole closer to Aceros. 



The adductor longus is attached by two tendinous heads ; the 

 upper one of these, as iu Aceros, is attached to the lower border of 

 the femur ; this corresponds to the fleshy insertion of the muscle in 

 Bucorvus ; the lower tendon is fused on its way with the inner head 

 of the gastrocnemius, which is continued upwards and reaches the 

 femur, and then bifurcates into two tendons of insertion. The 

 relations of the semitendinosus and of the accessory semitendinosus 

 are as in Aceros nipalensis. 



In Toccus these muscles are mucb the same as in Buceros. 



In Ceraiogymna elata I find a closer resemblance to Aceros than 

 to any other of the genera mentioned in this paper, but there is an 



