127 



cephalus svineval (described in " Proceedings of the Zoological Society," 

 1867, p. 481). Its use in these animals is to assist in the forcible eleva- 

 tion of the glottis, into which its fibres are continued, into the gaping 

 aperture of the posterior nares. 



6. I have seen a single specimen of the muscle, described by Boch- 

 dalek as the triticeo-glossus passing from the corpus triticeum in the 

 posterior thyro-hyoid ligament, to enter the substance of the tongue, with 

 posterior fibres of the hyo-glossus. Although frequently looked for, I 

 have but once seen it ; but Bochdalek has found it much more frequently 

 present, as out of twenty-two subjects he has found it present in eight. 

 My specimen was on the right side, but he has described it on both. 

 It seems to me to be nothing but a fourth differentiated part of the 

 hyo-glossus muscle, to whose posterior border it is nearly parallel, and 

 from the kerato-glossal part of which it is little more separated than 

 is the chondro-glossus from the basio-glossus.* 



7. The Scalenus minimus has occurred several times* and once in 

 connexion with a large bi-laminar scalenus posticus and medius ; it dis- 

 played no peculiarities. 



8. In the subject before mentioned as possessing the cleido- 

 occipitalis and the clavicular origin of the omo-hyoid, there occurred a 

 small new muscle {cleido-fascialis), which sprang from the back of the 

 clavicle between the origins of the sterno-hyoid and omo-hyoid, by a 

 narrow fleshy origin, passed upwards and inwards between the sterno- 

 hyoid and sterno -thyroid muscles for about an inch, and ended in a flat 

 expanded tendon, which was inserted into the fascia of the neck. It 

 seemed to be a tensor of the cervical fascia, and differed from the 

 vertical tensor, or costo-fascialis cervicis which I described in my last 

 paper. 



9. Two other instances of the mento-hyoidean muscle, figured in my 

 former paper, have occurred, in both cases double, and separate from the 

 digastric. This muscle is always on a plane superficial to the digas- 

 tric ; and I would be inclined to regard it as a modified cutaneous 

 muscle — an inner part of the platysma myoides. 



10. A few instances are on record of muscular bands in connexion 

 with viscera, and two very curious instances were found last session. 

 The first of these was shown by Mr. Hewitt, junior — namely, a thin but 

 distinctly muscular band, arising from the outer surface of the front 

 wall of the fibrous layer of the pericardium, and extending upwards in 

 the centre of the anterior mediastinum, was inserted into the capsule of 

 the thyroid body at its lower border. This pericardio-thyroid fascicle 

 was seen when the sterno-hyoids and thyroids had been removed, and was 

 traced downwards by the removal of the sternum. That a slip of this 



* Since the above was written I have found a large example of tritieeo-glossus, 

 and in another subject, dissected January 20, 1868, a distinct new muscle existed in the 

 larynx ; it arose from the inferior cornu of the thyroid cartilage, and passed inward* and 

 upwards to the outer angle of the base of the arytenoid cartilage. This kerato-arytenoid 

 muscle may have acted as an accessory dilator of rima glottidis. 



