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Show 192 DR. R. W. SHUFELDT ON [Apr. I, that exactly corresponds to this. It occurs upon the flexor aspect of the leg, and arises from the end of the fibula, close to the origin of the flexor accessorius, and as a strong little bunch of fibres it passes directly across to the bone representing the proximal tarsal row, and is inserted thereupon, on its proximal surface. 115. Abductor hallucis.-A small muscle that arises, tendinous, from the distal surface of the consolidated bone of the first row, and passing forwards is inserted into the proximal phalanx of the hallux at its base. Mivart found this same muscle present in Iguana (P. Z. S. 1867, p. 797). 116. Flexor minimi digiti.--Decidedly more inconspicuous than the last, this muscle arises from the same bone upon the fibular side of the foot, and passing forwards it makes a similar insertion into the base of the proximal phalanx of the little or outer toe. 117. Adductores digitorum.-Deep to all the plantar muscles thus far described, this set consists of three flat, carneous, little strips which are superficial to the interossei. They have a common origin from the bone representing the first tarsal row, and, radiating forwards over the sole of the foot as three distinct fasciculi, they become inserted in their proper order into the bases of the proximal phalanges of the second, third, and fourth toes, on the fibular side in each case. 118. Lnterossei plantares pedis.-Differing from these muscles in the manus, the interossei of the plantar region are more numerous than those of the palm, while those of the dorsum are less so. Their origin and insertion, however, are essentially the same. There seem to be five of these fasciculi present in the sole of the foot of Heloderma- three central ones, and one each to the inner side of the outer toe and hallux. 119. Interossei dorsales pedis do not seem to exceed three in number, and they are devoted to the three middle digits. They are disposed much as we find them in the hand. Mivart found interossei muscles also present in the pes of Iguana tuberculata, but the additional layer of fasciculi that he there describes, I take to be m y Adductores digitorum (see P. Z. S. 1867, p. 797). I find no muscles present in the pelvic limb of Heloderma suspectum other than those I have described above. IV. ON AN EXAMINATION OF THE CONTAINED ORGANS OF THE COSLOM. Cutting open the body-cavity by a median, abdominal incision, we at once bring into view the various organs that it harbours. It will be seen that these are covered by the reflected layer of the peritoneum, which in Heloderma is almost perfectly colourless, and being very thin can hardly be said to obscure the viscera from our view at all. This peritoneal layer differs from that membrane as we find it in Iguana and Lacerta, in that it is not deeply pigmented posteriorly and colourless anteriorly, as may be inferred from what |
