1868.] Mr. J. Wood on Variations in Human Myology, 487 



by Verheyiieus, Haller, Douglass, and others to be that part of the 

 superior constrictor which is attached to the side of the tongue, and 

 which was at first called by Winslow the " mylo-ylossus " (Comp. Myo- 

 graph. Spec. p. 93). For the sake of distinction the author has given 

 the name of genio-glossus to this remarkable slip. 



On the same side of the subject was the bifurcation of the anterior belly 

 of the omohyoid before mentioned (A), and also of the sterno-thyroid (^). 

 A considerable portion of the posterior fibres of each of these muscles was 

 split 0^ ; and the two slips, uniting together, were partly inserted into the 

 tip of the greater horn of the hyoid bone, but chiefly blended with the 

 fibres of the hyo-glossus (J() and middle constrictor {I) muscles. 



5. Trapezius. — In 2 males the fibres of this muscle reached only so far 

 down the back as the eighth and ninth dorsal spines respectively. (This 

 deficiency has been found by the author in 4 males out of 70 subjects, viz. 

 40 males and 30 females.) In one (No. 11) the cervical and dorsal portions 

 were completely separate and distinct muscles, one connected with the 

 occipital bone and ligamentum nuchce, and the other with the dorsal spinous 

 processes, — the two joining only at their insertion into the acromion pro- 

 cess. Something like this is the normal condition in the Mole, Ornitho- 

 rhynchus, and Echidna, and to a less marked extent in ths iigouti, according 

 to Meckel (Anat. Comp.) and Mivart and Murie (Proceedings of the Zoolo- 

 gical Society, June 26, 1866). It has been recorded in the human 

 subject by Soemmerring (De Corp. Hum. Fabrica, t. iii. 1796), Fieischmann, 

 Zagorsky, andTheile. Macalister has also found it (" Notes on Anomalies 

 in Human Anatomy," in Proc. Roval Irish Academy, April 23rd, 1866, 

 p. 21). 



In the female (No. 31) the cervical border of the trapezius was attached 

 to the clavicle as far inwards as the origin of the sterno-cleido-raastoid, 

 and so covering the posterior triangle entirely. A foramen or tendinous 

 arch, placed about the middle of the clavicle, allowed the passage of the 

 supraclavicular nerves. This very pecuhar formation has been described 

 by Macwhinnie (London Med. Gazette, No. 948, January 30th, 1846, 

 p. 194), and more recently figured by Gruber, of St. Petersburg (Vier 

 Abhandlung. 1847, S. 16, 17), by Hallett (Edin. Med. and Surg. Journal, 

 1848, No. 174), and by Macalister. The author believes it to be a blend- 

 ing or fusion of the cleido-occipital or cephalo-humeral with the cervical 

 border of the trapezius, of the same kind as the more common blending 

 of the same muscle with the hinder border of the sterno'cleido-mastoid. 



This view is further supported by the arrangement found in another 

 female (No. 35), on the right side of whom the trapezius detached from 

 the upper part of its cervical border a considerable muscular slip to be 

 inserted into the clavicle, close to the cleido-mastoid. Through a ten- 

 dinous arch or opening left between this slip and the lower part of the 

 normal clavicular fibres of the trapezius the hinder belly of the omohyoid 

 passed, along with the supraclavicular nerves, as befoie alluded to with 



