490 



Mr. J. Wood on Variations in Human Myology. [June 18, 



bral aponeurosis of the serratus posticus superior. In 1 male and the 2 

 females it was present on the left side only. One of them was subject 20 

 (given in fig. 3), where the abnormal muscle (e) is seen to pass under the 

 rhomboideus minor {d), to be inserted into the serratus tendon (/) under 

 the rhomboideus major (^), which is divided in order to show it. In 

 subjects 2, 3, and 23 its insertion was entirely into the serratus aponeurosis. 

 In Nos. 7 & 20 it was also connected with the spine of the seventh cer- 

 vical vertebra. It has been described by Mr. Macalister as the rhomho- 

 atloid (op. cit.Tp. 3, pi. 5. fig. I, a). In Haller*s * Disputationum Ana- 

 tomicarura Selectiorum,' vol. vi. (1733) p. 589, this muscle is described by 

 F. Walther under the name of the Museulus singularis splenii accesso- 

 riusy' or ^^Adjutor splenii.'^ 



8. Sundries. — In subject 3 the sterno-thyroid was double — the abnormal 

 part arising from the first rib-cartilage and costo-clavicular ligament, and 

 joining the normal origin halfway up the neck. This abnormal slip bore 

 much resemblance at its origin to the costo-fascialis described by the 

 author in his former papers, differing only in its upper termination in the 

 fibres of the sterno-thyroid, instead of the cervical fascia. The origin of 

 the sterno-hyoid was placed between the two heads. In No. 4 was a 

 muscular slip arising tendinous with the anterior scalenus, and inserted 

 fleshy with the medius. In the male (No. 7) and the female (No. 33) well- 

 marked specimens of the ^'^ museulus glandules thyroidecB^' of Soemmerring 

 were found. The microscope proved satisfactorily that the structure of 

 the formation was really muscular, and not median processes of the thyroid 

 gland, as sometimes is the case. The slips appeared to be offsets from the 

 inner fibres of the thyro-hyoid muscle, which had become attached to the 

 gland-capsule. In the female (No. 26) the thyro-hyoid was divided into 

 two distinct muscles, the inner one being the smaller, showing a tendency 

 to the formation of the levator thyroidese. In No. 9 the right sterno- 

 thyroid was joined by a clavicular slip, round which the tendon of the omo- 

 hyoid, as before described, played as through a pulley ; on the other side the 

 same muscle received a slip from the sterno-hyoid. The two sterno-thyroids 

 also decussated across the median line by a considerable portion of their inner 

 fibres. This arrangement is found in the Squirrel and some other Kodents. 

 In No. 8 was a cephalo-pharyngeus muscle having the somewhat unusual 

 origin from the spine of the sphenoid and spheno-maxillary ligament. At 

 its insertion it blended with the lower fibres of the middle constrictor. 



In the male (No. 1 1) and the female (No. 19) were found examples of the 

 sternalis hrutorum muscle. In both it was present on the right side only, 

 and well developed. In the male it arose tendinous from the tendon of 

 the sterno-mastoid, from the manubrium sterni 1 i inch below its upper 

 border, and from the fascia covering the pectorahs major muscle 2 inches 

 below the clavicle. Its whole length was 3^ inches, and it ended below 

 in a fleshy radiating way upon the fascia covering the sheath of the rectus 

 and external oblique. In the female it arose tendinous from the manu- 



