188-1.] 



ANATOMY OF SCOPUS UMBRETTA. 



551 



tendon gives off a broad ligament to the ankle, and then becomes 

 fused with the tendon of the flexor per/oratus et perf orans of the 

 3rd digit. 



23. The tibialis anticus is made up of two portions : the larger 

 arises from the cnemial crest of the tibia, the smaller from the front 

 part of the outer condyle of the humerus. The two unite to form a 

 strong tendon, which is inserted in the usual fashion. 



Fig. 4. 



Fl.p 



n 



Deep plantar tendons of Scopus umbretta. 

 Fl.h, Fexor hallucis ; Fl.p, flexor profundus digitorum 



24. The extensor digitorum is a small muscle arising from the 

 crest of the tibia and from the front part of the bone for the space 

 of about an inch ; its tendon supplies all the digits with the exception 

 of the first. 



In the foregoing description of the muscles of Scopus, more atten- 

 tion has been paid to those which are known to vary in the different 

 groups of birds. 



In his paper on certain Muscles in Birds l , Prof. Garrod distin- 

 guished the Pelargi from the Herodiones by the presence in the former 

 of the ambiens muscle, two intestinal caeca, and a double pectoral 

 muscle; in both groups the femoro-caudal', semitendinosus, and 

 accessory semitendinosus were present. In a subsequent paper 3 , how- 

 ever, Prof. Garrod stated that the ambiens was not always present in 

 the Storks, since he failed to find it in Xenorhynchus senegalensis and 

 Abdimia sphenorhyncha ; it is therefore impossible to separate the two 



1 Coll. Papors, p. 221. 



2 Absent in a low (Storks, e. g. Lcptojitilus argala. 



Coll. Papers, p. 421. 



