. Monographies du North American rodentia [microform]. Rongeurs ; paléontologie ; Rongeurs ; PALÉONTOLOGIE. I I'i.' li lii. noo MONOGRAPHIES DE NOBTO RODENTIA AMÉRICAIN. Le muscle temporal est d moilernte vrac, le Fossa d'être comparalively peu profonde. Le masseteric ptérygoïde et masses sont de grande taille. Le mas- seter forme une masse bombée à l'extérieur de la mâchoire, remplissant complètement le grand fossa formé par la torsion vers l'extérieur de l'angle de l'juw, et définies à l'avant par une crête oblique déjà décrit en parlant de l'os. Une stout tendon découle de l'apophyse zygomatique du maxi

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. Monographs of North American rodentia [microform]. Rodentia; Paleontology; Rongeurs; Paléontologie. I I'i.' li lii. noo MONOGRAPHS OF NOBTO AMERICAN RODENTIA. The temporal muscle is of moilernte bulk, the fossa being comparalively shallow. The masseteric and pterygoid masses are of great size. The mas- seter forms a bulging mass on the outside of the jaw, completely filling the great fossa formed by the outward twist of the angle of the juw, and defined in front by an oblique ridge already described in speaking of the bone. A special stout tendon arises from the zygomatic process of the maxillary, just below the anteorbital foramen, which latter opening, notwithstanding its small size and apparently inconvenient relations, transmits a small fascicle of the niasseter along with the superior maxillary nerve. The muscles acting upon the hyoid bone, both from the thorax and from the jaw, are well developed. A pair of stout fusiform muscles connect tiie liyoid with the back of the skull. I find no trace of direct muscular connec- tion between the hyoid and the scapula (omo-hyoid). Sterno-mastuid and cleido-mastoid are well developed, and distinct from each other for nearly, if not quite, all of their extent, though their thoracic insertions are very near together. The diaphragm is very thin, even its most muscular portions, and a large port of it is simply membranous. There is a large, well-defined, central "tendon", as broad as the muscular portion on either hand. This is of oval shape ill most of its extent, but with two posterior prolongations, one on each side, separated by the fleshy "pillars" which arise from the vert«brjB, and pro- ceed to embrace the oesophageal orifice. Muscular fibres are scarcely or not developed laterally behind, where simple membrane may be traced to the insertion of the organ along the floating rib. The radiating muscular portion of the diaphragm, then, is a single set of fibres arranged in fan-shape around the anter

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