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Show 850 MR. ST. GEORGE MIVART ON THE [Dec. 6, final destiny might afford important information for helminthology and the investigation would be easy now we have learned this station and phase of the worm. Hence 1 have given the sketch (fig. 9, p. 848), and hope soon to examine more fully the anatomy of this entozoon in fresh specimens. The average length of each worm was ^ of an inch ; its shape oval with two projecting papillse ; the integument distinct and composed of two coats, the body filled with pale round corpuscles and many oval ones. There seemed to be a mouth with a feeble current setting into it; but neither booklets, spines, nor vibratile cilia were visible. The motions by contraction and expansion of the worm were very remarkable; and this evidence of its vitality continued two or three days after the death and putrefaction of its host. 11. O n the Myology of Chamceleon parsonii. By ST. G E O R G E M I V A R T , F.R.S. The singular modifications of the appendicular skeleton of the Chameleon, and the remarkable resemblances which exist between its pectoral and pelvic portions, naturally suggest that its myology cannot be other than interesting. An unusually good opportunity of investigating that myology having, through the kindness of my friend Professor Flower, presented itself, I beg to bring before the Society the results of the dissection of a magnificent specimen of the above-named large Chameleon of Madagascar. AXIAL MUSCLES. I. MUSCLES OF THE HEAD. Mylo-hyoideus anterior (figs. 1 and 3, M]). This muscle forms, as usual, a delicate layer which arises inside the ramus of the mandible, meeting and joining its fellow of the opposite side beneath the throat. Its fibres pass downward and backward; and its posterior portion overlaps and is superficial to the anteroinferior part of the posterior mylo-hyoid. Mylo-hyoideus posterior (figs. 1 and 3, M2). A considerable but delicate muscular lamella arises from the inner side of the suspensorium of the mandible, and, passing downwards beneath the throat, meets its fellow of the opposite side. It is immediately superficial to the genio-hyoid, but anteriorly it passes above the anterior mylo-hyoid, so that the fibres of the latter are superficial to it. Posteriorly this muscle gradually loses itself in the delicate fascia investing tbe muscles of the chest. Above, this muscle is closely connected with a thin muscular layer which springs from the dense fascia binding down the muscles of the occipital crest, and which ends in the fascia which encloses the levator claviculse. |