744 



P TA RMJGA N—P TER YL OS IS 



ih 



PTAEMIGAN, Gael. Tarmaclian, see Grouse (p. 392, note). 



PTEROCLETES,! Mr. Sckter's name {Ibis, 1880, p. 407) for 

 the Order composed of the Sand-Grouse, equivalent to the 



PTEROCLOMORPH^ of Prof. Huxley {Proc. Zool. Soc. 1868, 

 p. 303), which itself was anticipated as a group by Bonaparte's 

 Pediophili in 1831 {Saggio &c. p. 54). 



PTERYGOIDS, a pair of bones in the roof of the mouth of every 

 vV> bird, articulating with the Quadrates and the anterioi^end of the 

 . y. ) Palatals, as well as, directly or indirectly, with the Basi-sphenoid 

 ^ and other parts of the Skull. 



PTEEYLOSIS signifies plumage considered in regard to the 



distribution of its 

 growth. In only a 

 few Birds do the 

 FEATHERS grow over 

 the whole body, but 

 they are generally 

 restricted to well- 

 defined patches or 

 tracts, which in 1833 

 received from Nitzsch 

 {Pterijlographise Avium 

 pars prior, p. 11) the 

 name oiptertjla (Trrepo v, 

 pluma ; vXrj, sylva) or 

 " feather-forests," in 

 opposition to the ap- 

 teria, or featherless 

 spaces, which inter- 

 vene. Presumably 

 the first bird-like crea- 

 tures had their skin 

 uniformly clothed ; 

 but the Ratitie, Sphen- 

 isci and Palamedea are 

 almost the only exist- 

 ing forms having the 

 " Contour - feathers " 



BoTADRus STELLARis. Ventral ami dorsal aspect. 



Thf ilai'k patches shew the "Powder-downs." 



(After Nitzsch.) 



(p. 241) evenly dis- 

 posed over the body. 

 It would be, however, 



^ It is no more easy to find a plural for the word Pterodes than for Patrocles, 

 Themistocles or many others, but we may be (juite sure that it would not take 

 this form. Sundevall many years ago {K. Vet.- Ac. Handl. 1836, p. 119) had 

 Fterodides, wliicli is pei'haps possible. 



