. Bulletin - United States National Museum. Science. 186 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. nent and deep ligament pit excises a portion of the fulcra* ridge Just beneath the large circular central canal. Bej'ond (distal to) the fulcral ridge the joint face is divided into two portions, an inner and an outer, of which the latter is somewhat broader than the former, by a narrow intermuscular ridge which does not reach quite to the distal edge of the joint face. The proximal half of the area beyond the fulcral ridge is raised into a broad platform nearly on a level with the summit of th
. Bulletin - United States National Museum. Science. 186 BULLETIN 82, UNITED STATES NATIONAL MUSEUM. nent and deep ligament pit excises a portion of the fulcra* ridge Just beneath the large circular central canal. Bej'ond (distal to) the fulcral ridge the joint face is divided into two portions, an inner and an outer, of which the latter is somewhat broader than the former, by a narrow intermuscular ridge which does not reach quite to the distal edge of the joint face. The proximal half of the area beyond the fulcral ridge is raised into a broad platform nearly on a level with the summit of the fulcral ridge; the distal half is rather deeply excavated. This excavation is especially prominent on the inner side, in the form of a right angled tri- angle, of which the right angle is over and just to the inner side of the middle of the central canal, the hypotenuse opposite is slightly convex, and the angle just inside the middle of the distal border of the joint face is produced in the form of a very narrow but deep groove along the distal border of the outer half of the joint face to the outer distal corner. This fossa, very large and triangular on the inner half of the joint face, but on the outer half reduced to a narrow band along the distal border, contains muscle fibers. On the outer portion of the joint face beyond the ful- cral ridge the excavation is not so deep. Here it takes the form of a right-angled triangle, of which the right angle, sharply rounded off, lies at the distal outer corner of the joint face, the two adjacent sides are about the same length, and the hypothenuse, running from above the central canal just beyond the mid- dle to the outer end of the fulcral ridge, is concave, but more or less indefinite. This fossa, less deep than that on the inner side of the joint face, lodges a large interarticular ligament. On the outer side this articula- tion resembles very closely that on the distal end of the radial, but on the inner side the dorsal ligame
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