228 MR. G. p. MUDGE ON THE MYOLOGY 



given off, each possessing an independent origin along the anterior half of the dorso- 

 lat(>ral surface of tJie urohyal, and which I shall allude to as the ceratoglosKUs superior 

 accc.ssoriiis. The condition of the muscle which is exhibited in tliis Parrot is very 

 similar to that in Psittinus incertns (text-fig. 5, crj.s., cg.H.a., ten.). In Cacntua rosei- 

 cainlla the muscle in respect of its origin and insertion is like that in Cacntua 

 (jalerita, but resembles CalyptorhyncJuis hanksi in the possession of a ceratoglossus 

 superior accessorius, from which it differs, however, because the origin of this extends 

 the whole length of the urohyal and it is almost completely separated from the parent 



Text-fljr. 5. 



cg.s. 



H.B. 



Psittinus incerius. — Dorsal view, to show the connection of the ceratoglossus superior with the mesoglossus 

 and the formation of an accessory muscle (cr/.s.a.), partially separated from the parent one by a bifid 

 tendon (ten.), (Thrice nat. size.) 



Additional letters, 

 cr/.s. = ceratoglossus superior. 

 C(/.s.a. = „ „ accessorius. 



H.B. = hypobranchial. 



wg. = mesoglossus. 

 P.P. = parahyal process. 

 ten. = tendon. 



muscle. In Pyrrliura leucotis (PI. XXVII. fig. 19) the muscle is similar to that in 

 Cacatua galerita. 



In Stringops hahroptilus (PI. XXVII. fig. 18) the origin of the muscle extends back 

 to the anterior third only of the hypobranchial, and in the possession of a bifid tendon 

 running backwards from its insertion it is similar to that in Cabjptorhynchus hanksi, 

 though it is much more strongly developed. A ceratoglossus superior accessorius 

 (cg.s.a.) like that in Cacatua roseicapilla is present, but differs slightly from that in its 

 insertion to the crura of the bifid tendon, instead of to the muscle itself, so that it is 

 otherwise completely separated from the parent muscle. 



