250 



MR. G. P. MLTDGE ON THE MYOLOGY 



Calopsittacus, Ededns, Chrysotis, FmUinuH, Nestor, find Lorhis ncitlicr [lovtion is covered 

 by the mandible. I was able to obtain tlie tongues only of Pijrrhulojimh and Cahji>io- 

 rhijnchtfi, and could not, therefore, examine the particular feature now considered. 



In the great majority of Parrots the halves of the posterior portion f)f the muscle 

 are inserted one on either side to a bony or cartilaginous nodule (N.) that lies at the 

 anterior end of the urohyal upon its ventral surface, and to which it is fastened by a 



Text-figure 11. 



st.h.- 



seha 



se.h.p. 



Palaornis iorquata. — Yentral view. On the left, one-half of the lower bill has been removed, and the rami of 

 the mandible slightly pulled outwards to show the origin of the gcniohyoideus ((//'.«'., gli.ic'., and (jh.p.). 

 (Twice nat. size.) 



Additional letters. 



ql;.a}. &■ a'. = anterior and posterior hrnnches of 

 anterior division of geniohyoideus, 

 sc.li.a. = serpihyoideus anterior. 



se.h.ji. = serpihyoideus posterior. 

 sJi. = sternohyoideus. 

 23.t. = pterj-goideus. 



sheath of connective tissue. In Clirysotis this nodule is absent, and the muscle is 

 inserted directly to the sheath investing the urohyal at the root of that. In Conurus 

 (text-fig. 10) (C. liolochlorus excepted) the nodule is elongated and extends to the 

 posterior extremity of the urohyal, the insertion of the muscle following the e.xtension 

 of the nodule ; Cahj^^orhynchiis is similar in respect of that. In JEcIedits it is inserted 

 to the cartilaginous continuation of the urohyal. 



