1058 



DR. P. CHALMERS MITCHELL ON THE 



Psittaci. Strmgops hahroptilus. Melojysittacus itnchdatas. 

 Nymphicus uvceensis. Nanodes (Lathcwms) discolor. Cyano- 

 rhamphus aljmius. Platycercus eximius. Ajyrosmictus cyano- 

 pygms. Palceornis fasciata. Eclectus pectoralis (2 examples), 

 E. roratus. Pceocephalus meyeri. Galea melanocephala. Pachynus 

 hrachyiirus. Chrysotis (? species). Myojisittacus nioncichus. 

 Conurus jendayi. Oalopsittacvs novce-hoUandice. Cacatua sul- 

 phurea. Ty-ichoglossus novce-hoUandice. Lorius domicella. 



Parrots carry further the specialization of the generalized type 

 which is already indicated in the Ouculi. In every case both 

 muscles are present, but there are different degrees to which the 

 longus is I'educed and the brevis increased. In Stringops (text- 

 iig. 184) the P. longus is a large muscle with good supei'ficial and 

 fascial origins and a deep origin extending nearly the whole 

 length of the shaft. The muscular belly narrows to a short 

 tendon which is inserted to the capsule of the flexor tendons 

 representing what I term the anchor in this memoir, A few 



Text-fio-. 184. 



-PBRE. 



ANCH- 



Peroneal muscles of Stringops hahroptilus. 



Description and lettering as in Text-figure 179. 



By. Fibrous bridges. 



delicate strands can be made out passing in the direction of the 

 usual slip to III, but that structure is certainly absent func- 

 tionally, even if there be a trace of it morphologically. I have 

 found a small superficial origin of this muscle in several other 

 Parrots ; it was relatively large in Calopsittacics, and present in 

 Cyanorhamphus and Gaica. Usually, however, it has been lost, 

 and the normal condition in Parrots is for the P. longus to be 

 reduced to a deep origin. This may be large as in Eclectus, 

 long but slender as in Platycercus, or it may be so small as in 



