. Bulletin - United States National Museum. Science. FORT U2^'I0X OF CRAZY MOUNTAIN FIELD, MONT. 189 CLAENODON VECORDENSIS Simpson Figure 42 Claenodon vecordensis Simpson', 1935d, p. 232. Type.—'NM. no. 13781, left AP-^. Collected by A. C. Silber- ling and G. G. Simpson, 1932. Horizon and locality.—Loc. 9, 300 feet above the base of Fort Union No. 1, Crazy Mountain Field, Mont. Diagnosis.—M^ similar to that of C. silberlingi in outline but 10-20 percent larger and somewhat more transverse; hypocone vestigial, strong crenulated internal cingulum. M^ relatively as large as in and sim
. Bulletin - United States National Museum. Science. FORT U2^'I0X OF CRAZY MOUNTAIN FIELD, MONT. 189 CLAENODON VECORDENSIS Simpson Figure 42 Claenodon vecordensis Simpson', 1935d, p. 232. Type.—'NM. no. 13781, left AP-^. Collected by A. C. Silber- ling and G. G. Simpson, 1932. Horizon and locality.—Loc. 9, 300 feet above the base of Fort Union No. 1, Crazy Mountain Field, Mont. Diagnosis.—M^ similar to that of C. silberlingi in outline but 10-20 percent larger and somewhat more transverse; hypocone vestigial, strong crenulated internal cingulum. M^ relatively as large as in and similar in structure except for smaller metacone and more evenly rounded external border; vestigial hypocone present. Discussion.—This species is smaller than the smallest IvQown variants of C. ferox, has a smaller hypocone on M^, and the contours of M^ and M^ are different and beyond the known range of variation of that species. C. silberlingi is somewhat smaller and has different tooth proportions. M^ is much larger and less transverse than in C. mon- tanensis and has the posterior part better developed. The small unnamed Torrej on species is much smaller and has less wrinkled enamel, and the internal cingulum is feebler or FrGURE i2.—Claenodon vecordensis Simpson, DO. 13781, left M2-3, crown view. Nat- ural size. Figure i3.—'!Claenodon sp., no. 6158, left Ml, crown view. Natural size. It is unfortunate that another poorly known species must be added to this genus, already burdened with several species of doubtful status, but the present specimen is identifiable and surely cannot enter into any species previously established so far as their range of variation is known or can be fauiy inferred. It is, furthermore, from a very dif- ferent geological horizon from the other Fort Union claenodonts and one from which little material has been obtained, so that its strati- graphic importance also necessitates some convenient designation for it. Mea
Size: 1702px × 1469px
Photo credit: © Book Worm / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
