. La cyclopaedia d'anatomie et physiologie. Anatomie ; physiologie ; Zoologie. Bon os et os innominatum marsupial Wombat, non seulement s'étend vers l'extérieur. mais est incurvée pour. Dans la symphyse des Potoroos l'ischia, ou la partie inférieure de ce qui est communément appelé la symphyse pubienne, est produit ante- riorly. La longueur de cette symphyse pubienne, et la ligne droite formée par la marge la plus faible de l'ischia est une caractéristique de la structure du bassin chez la plupart des marsupiaux.. Le bassin et les os marsupial i,f le koala. allongé, aplati, et plus ou moins courbé, étendu à l'extrémité proximale

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. The cyclopædia of anatomy and physiology. Anatomy; Physiology; Zoology. Right os innominatum and marsupial bone, Wombat. not only extends outwards but is curved for- wards. In the Potoroos the symphysis of the ischia, or the lower part of what is commonly called the symphysis pubis, is produced ante- riorly. The length of this symphysis, and the straight line formed by the lower margin of the ischia is a characteristic structure of the pelvis in most of the Marsupials.. Pelvis and marsupial bones i, f the Koala. elongated, flattened, and more or less curved, expanded at the proximal extremity, which sometimes, as in the Wombat, is articulated to the pubis by two points; they are relatively straightest and most slender in the Perameles; shortest in the Myrmecobius, where they do not exceed half an inch in length; longest, flattest, broadest, and most curved in the Koala, where they nearly equal the iliac bones in size. They are always so long that the cremaster muscle winds round them in its passage to the testicle or mammary gland, and the uses of these bones will be described in treating of that muscle. With reference to the interesting question— What is the homology or essential nature of the ossa marsupialia? I entirely concur in the opinion first advanced by the able anatomist, M. Laurent, * viz. that they belong to the category of the trochlear ossicles, commonly called sesamoid, and are developed in the tendon of the external oblique which forms the mesial pillar of the abdominal ring, as the pa- tella is developed in the tendon of the rectus femoris. I had arrived at this conclusion from independent researches, and unaware of any prior announcement of this view when I dis- cussed the question before the Zoological So- ciety in 1835.f I cannot, however, participate in the opinion of M. Laurent and the celebrated De Blainville, that the marsupial bones are superadded to the abdominal muscles to aid in an unusually energetic compression required to expel the

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