252 



Wl{. G. p. MUDGE ON THE MYOLOGY 



contact with the posterior rnai-gin of tlie hitter. In Edectus, Pijrrhura, P.vitinus, and 

 Jjorius /lavu-paiUatits (text-fig. 14, p. 2-5G) the interval is a little greater. In Eos, 

 Chrijsotis, Connrus (text-fig. 10, p. 248), Vyanolyseus, and Brotogenjs (text-fig. 1.3, 

 p. 252) tlie interval is very great, except of course at the common origin of the two 

 portions. 



The general conclusion arising from the foregoing facts is that both the anterior and 

 ])osterior portions of the muscle are undergoing retrogression. Stringops stands alone 



Text-figure 13. 



Brotogerys j}yrrlio]itcrus. — Ventral view. On the left the serpihyoideus has been partially cut away. 



(Twice nat. size.) 



Additional letter, 

 N. = cartilaginous nodule. 



in that its muscle exhibits the most primitive condition, all the others in respect of 

 this muscle having attained a fairly advanced progression, some slightly more than 

 others. There is no definite comparison possible in any given individual between 

 the stage of specialization reached by this muscle and that attained by either the 

 ceratogiossus or thyroglossus muscle. 



The more or less extensive connective-tissue sheet, or strip, that extends backwards 

 from the muscle in some Parrots is shown to be a persistent fascia in virtue of the facts 

 that it is continuous with the ventral and dorsal fasciae of the muscle, and that, in 



