512 MES8BS. BEDDAED a:st> parsoij's OX [June 6, 



almost uniform arrangement of the patagial tendons. In them 

 the three tendons are very difficult to distinguish because the 

 fibrous membrane between them, of \\hich they are only specialized 

 parts, is as thick as they are. The result is that in these birds the 

 patagial muscle seems to be inserted by a broad, short, membra- 

 nous-looking tendon. 



Conurvs shows a transitional stage between these last genera 

 and the typical arrangement ; the three tendons are more distinct, 

 but they are equally short and show the same mode of attachment 

 to the fleshy part of the muscle. 



Lathamus is remarkable for having the anterior tendon separate 

 in its whole length from the middle one, instead of being fused 

 with it in the upper part of its course. 



Chrysotis and Bulhorhiinclivs have a small extra tendon between 

 the midtlle and posterior ones : in C. fpiildiinji this was only 

 present on one side, but in C. lencocciihala it was found on 

 both. 



Fsitfacus has three tendons which are completely separate in 

 the whole of their course, and in this respect it corresponds to 

 Lathamus. We are, however, inclined to look upon the anterior 

 tendon as representing the fused anterior and middle tendons of 

 Lathamus, and to regard the middle tendon as an extra one as in 

 Chri/sotis. Our reasons for this are that there is a considerable 

 interval between the two tendons, and that they do not diverge as 

 in all other cases. If this view is correct, the patagial tendons of 

 Psittacus closely resemble those of C'hnjsotis, while they also agree 

 in having the anterior deltoid larger than the posterior, in the 

 absence of a lower head to the anconeus, and in having the deltoid 

 completely covered by the tensor patagii. 



TihiaUs anticus. — The tibialis anticus in almost all the genera 

 which we examined was inserted by a single tendon except in 

 Chrysotis (of which two species were examined), where this tendon 

 was double. The only genus which resembled Chrysotis was 

 Psittacus, m\\\\\c\\ the tendon was really double ; but the two parts, 

 altliough easily separable, were slightly connected together. In 

 several other genera we detected a slight line of demarcation in the 

 tendon, but it was not sufficiently definite for us to regard it as 

 of any cla-ssificatory value. 



Peroneals. — The peroneus longus and brevis are, as far as we 

 have observed, always present in Parrots, but the origin of the 

 former differs somewhat in different genera. 



In iStriuiio^is and Xestor the peroneus longus rises from the 

 front of the bony fibula and its membranous continuation for about 

 the upper half of the leg. The muscular belly overlaps that of the 

 peroneus brevis very much near its origin, and the muscle is large 

 and well marked. 



In Chrysotis, on the other hand, the peroneus longus is very 

 small and only rises from the membranous continuation of the 

 tibula in the lower part of the leg ; it is so small that it does not 

 overlap the peroneus brevis at all but lies behind it. 



