410 Proceedings of the Royal Irish Academy. 



searched for. From its peculiar action on the contour of the submen- 

 tal region, it has been called by German authors the doppelhinnmushel. 



Masseter. — The only anomaly I noticed in connexion with this 

 muscle was a coalescence of its deeper fibres with the lower fibres of 

 the temporal. This condition has been also observed by Professor 

 Macalister, and I have met with it three times. The bursa massete- 

 rica described by Monro between the two parts of this muscle I have 

 failed to find, although I have carefully examined the muscle for this 

 special purpose in thirty subjects. Of the bursa described by Hyrtl 

 between the deep part of the muscle and the capsule of the temporo- 

 maxillary articulation I have met several examples. 



Buccinator. — A few fibres of this muscle I have seen to arise from 

 Steno's duct in three instances. 



Pterygoideus proprius (Henle, Gruber, Theile, Macalister). — Of 

 this muscle I have met with three examples in one hundred and twelve 

 bodies, passing as usual from the crest on the great wing of sphenoid 

 to posterior edge of external pterygoid plate. 



Sterno-cleiclo-mastoideus. — Of this muscle I have met with many 

 anomalies, in some cases completely divided into sterno-mastoid and 

 cleido-mastoid : of this I have met with eleven examples. The cleido- 

 mastoid I have found in three cases divided into two completely sepa- 

 rate superimposed laminae, distinct to the mastoid attachment. In five 

 cases I have seen the upper sternal fibres of the pectoralis major taking 

 an accessory tendinous origin from the outer edge of the sternal head 

 of this muscle. 



Levator claviculae (Wood). — Of this muscle I have seen one very 

 well developed specimen attached at its upper end to anterior tuber- 

 cles of transverse processes of second, third, and fourth cervical 

 vertebrae, and below to the middle third of upper border of clavicle 

 outside the cleido-mastoid. 



Coraco-cervicalis (Krause, Hallett). — Of this muscle, which is no 

 other than the posterior belly of omo-hyoid terminating in the cervical 

 fascia — when the anterior belly is absent — I have met with two exam- 

 ples. I have in another case traced a small aponeurotic slip from the 

 upper edge of the tendon formed by posterior belly of omo-hyoid, along 

 the normal course of anterior belly to the body of the hyoid bone. 



Omo-hyoid. — Of the origin of the posterior belly of this muscle 

 from the coracoid process I have met with seven examples [coraco- 

 hyoid of Gruber). In one case the origin of this belly was from the 

 acromion process. (Origin from first rib as described by Wagner and 

 Gruber I have never seen.) Of the purely clavicular origin I have 

 met with two specimens; in each case the muscle was monogastric, and 

 presented at the level of the normal tendon merely a few longitudinal 

 tendinous fibres on its deep surface {cleido-hyoid of Schmidtmiiller). 

 In addition to the variations above described under the head of the 

 musculus coraco-cervicalis I have found in two other cases the anterior 

 belly represented by two distinct tendinous slips passing from the nor- 

 mal tendon up to body of hyoid bone. 



Crico-corniculatus (Tourtual) : herato-cricoid (Merkel) : crico-thy- 



