. Bulletin - United States National Museum. Science. 54 BULLETIN 110, UNITED STATES NATIONAL MUSEUM. With specimen No. 836T, , are a considerable number of parts of the abdominal ribs, several of which are in a beautiful state of preservation, as shown in figure 38. While these were found disassociated, a study of them in conjunction with those of specimen No. 4734, , enables me to determine with some de- gree of certainty several points hitherto obscure. The more characteristic of these segments are shown in figure 38. The long slender bone shown in A, (fig. 38) is unquestiona
. Bulletin - United States National Museum. Science. 54 BULLETIN 110, UNITED STATES NATIONAL MUSEUM. With specimen No. 836T, , are a considerable number of parts of the abdominal ribs, several of which are in a beautiful state of preservation, as shown in figure 38. While these were found disassociated, a study of them in conjunction with those of specimen No. 4734, , enables me to determine with some de- gree of certainty several points hitherto obscure. The more characteristic of these segments are shown in figure 38. The long slender bone shown in A, (fig. 38) is unquestionably the outer or most lateral segment of an abdominal rib. Its outer half is rounded in section and sinu- ous in its curvature, with a tapering ex- tremity. The inner or proximal half is flattened on one side, probably the an- terior, along which a similar, though oppositely flattened side of the second segment laps (fig. 39 and pi. 15), where- they are shown articulated as found in place. The second segment (D and E, fig. 38) is a regularly curved bone deeper than wide, with a tapering outer extremity, and a slightly enlarged proximaj articu- lating end, the face of which is oblique to the longer axis of the bone. The posterior face of this end of the bone is flat, but gradually changes to a longi- tudinal groove as the outer end is ap- proached. The articular end articu- lates with the third segment as shown in E, figure 38. The third segment (B, and lower part of E, fig. 38) is short with a very V,,. o» Q^™ ..„ .. much expanded distal end having a cup- FiG. 38.—Segments of abdominal ribs of Anteodemus va- ^ '^ . LENS leidt. No. 8367, yi, Lateral segment; 5, pcd articular surfacc that is obliquc to THIRD SEGMENT WITH ARTICULAR PROXIMAL END; C, SHORT ^J^ J ^^^ ^f Jj^g ^ J(. Jg ^J^Jg SEGMENT POSITION undetermined; D, SECOND SEGMENT SHOW- "^ INO THE EXPANDED DISTAL ARTICULAR END; E, SECOND SEG- CXpaudcd, CUppcd Cud tliat artlCUlatCS MENT, SAME AS D. BUT COOS
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
