Anatomy of Acanthidositta chloris. 605 



acetabular region, gives place to a couple of rows of senii- 

 plumous feathers, continued backwards to the oil-gland. 



Pt. caudalis. — There were ten rectrices, all moulting. 



Pt. coll. ventralis. — This is a fairly broad tract, branching 

 high up the neck, and passing backwards into the 



Pt. ventralis (text-fig. 35, pt.v.). — This tract does not shew 

 the usual division into an inner and an outer branch, but 

 suddenly narrows at a point corresponding with the position 

 of the knee when flexed; from this point inwards it is 



Text-fig. 35. 



/ '"■'•'■-■ vr 



pt. cdl « 



Lateral aspect of the same specimen, to shew the pterylosis. The fold 

 of skin in which the pteryla colli dorsaiis is seated is well shewn. 



Additional letters : pt.v. = pteryla ventralis; pt.col. v. = pteryla 

 colli ventralis. 



continued backwards in the usual manner to the cloaca. 

 Over the breast, in the region enclosed by the ventral tract, 

 there occur numerous but sparsely scattered and minute 

 brush-like tufts representing degenerate contour-feathers. 



Pt. humeralis (text-fig. 31, pt.h.). — Short and feebly 

 developed. 



Pt. femoralis (text-fig. 34, pt.f.). — Like the pt. humeralis, 

 very feebly developed. 



Pt. alaris. — The wing is eutaxial ; there is no carpal 

 diastema. Primaries 10 ; 10th long. Carpal covert mode- 

 rately long, and slender carpal remex. Secondaries 9, the 

 last (9th) degenerate and scarcely distinguishable from its 

 covert. Possibly what appears to be the covert of the 10th 

 remex is actually the 11th remex, since this feather is longer 



SER. VIII. VOL. V. 2 S 



