I'SITTACr. 9 



A. 136. Tlic right humerus, with the proximal extremity imperfect ; 

 from the Thosphorites of JJach, uear Lalbencjuc (Lot), 

 Fiance. The imperfection of the proximal extremity docs 

 not admit of determining whether there was a tricipital 

 fossa. Purchased, 1884. 



A. 136 a. A right coracoid, not improbably (judging from its 

 niiueral condition and relative size) associated with the 

 preceding specimen ; from Bach. There is no perforation. 



Purchased, 1884. 



Suborder III. PSITTACI. 



Desmognathous birds in which the fourth digit of the pes is 

 permanently directed backwards. The tarso-metatarsus is usually 

 short, and is always extremely expanded from side to side, and 

 compressed from front to back, so tluit it has no true lateral surfaces. 

 Its distal extremity is much expanded, and the trochlea for the 

 fourth digit divided into two distinct articidations, thus admitting 

 of the backward direction of that digit. The tibio-tarsus closely 

 resembles that of the Striges, generally showing the same absence 

 of a bridge over the groove for the extensor tendons. 



In the skull there is a complete transverse hinge between the 

 cranium proper and the rostrum, the latter being arched and hooked 

 at the extremity ; the orbit is either partially or completely sur- 

 rounded by a bony ring ; and the mandibular rami are deep, and 

 pass into one another by a rounded symphysis. 



Family STRING OPIDii]. 



The tarso-metatarsus is comparatively long. The tibio-tarsus 

 has a bony extensor bridge. The two rami of the furcula are 

 reduced to small styles, not meeting in the middle line. 



Genus STRINGOPS, Gray \ 



In the skull the nares are very large, and the prcmaxilhx; of 

 great width and medium length. The orbital ring is complete. 



Geneni of Birds, vol ii. p. 42(5 (1845).— 67/ 



7^0/JS. 



