BY \y. J. S. McKAY. 347 



Leche says — " Bei Ornithorhynchus entspringt er vom Os cora- 

 coideuin und von der Scapula; spaltet sich wie bei Echidna; die 

 dorsale Schichte inserirt an der InnerHiiche des Unterkiefers, die 

 ventrale am Basihyale." 



Meckel — "Musculi ossis hyoidis .... ex illis primus 

 est omo-raylohyoideus. Hoc nomine venire debet musciilus satis 

 longus et latus, a parte scapulae coracoideie et quidem a marginis 

 ipsius snperioris dimidio rainore exteriio oriundus. Initio simplex, 

 infra ramo transverse ossis Tformis tectus adscendit, mox in 

 stratum superficiale et profundum fissus. Profundum corpori 

 hyoidis affigitur, superticiale extrursum et antrorsum versum 

 maxillpo infeiioris faciei interiife, paulio ante ipsius extremum 

 posticum inseiitur. Quamvis musculus hie maxilla? iiiferiori 

 inseratnr, niinime haec ipsius pars pro mylohyoideo haberi debet, 

 quum praeter ipsum verus, mylohyoideus adsit, nee insertio, in 

 faciem externam facta, conveniat. Caput fortiter deprimere, et 

 OS aperire valet. 



" CI. Blainvillius, nulla omo-hyoidei adesse vestigia monens, hunc 

 musculura cum sterno-thyroideo atque hyoideo confudisse videtur." 



CuviER and Laurillabd, in PI. 266, fig. 2 (e), omohyoidien, 



Testut says — " Du reste, nous voyons dans quelques especes 

 animales le muscle omohyoidien Ini-meme envoyer quelques 

 f.iisceaux siu-dessus de ros hyoide ; chez rOrnithorhynqiie notam- 

 ment, d'apies Cuvier et Duvernoy, le muscle omohyoidien est un 

 double muscle qui s'attache an corps de To-s hyoide et a la fuce 

 interne et posteiieure de la machoire iuferieure." Testut further 

 says that Macalister has .seen a fasciculus of the omohyoid pass 

 into the mylohyoid, after having passed over (without becoming 

 attached to) the hyoid. Wood has noticed the union of the mylo- 

 hyoid with the stylohyoid. 



Nekvrs. 



Echidna. (Figs. 13, 14). 



N. acressorius (i). The spinal accessory is a large nerve, and 



after emerging from the jugular foramen it runs posteriorly and 



gives off a small branch (3) which joins a twig from the second 



