. Bulletin of the Department of Geology. Geology. 1911] Merriam: Saurian Fauna of Spitzbergen. 321 the Italian specimens thus far described in possessing a sixth digit. The first three segments of the anterior limbs are prac- tically identical with those of Cymbospondylus(l) natans, a Mixosaurus-like species from the Middle Triassic of Nevada. The posterior limb (fig. 4) is almost identical in form with that of Mixosaurus cornalianus, even to the duplication of a peculiar arrangement of the proximal carpals found in the Italian Pig. 4. Mixosaurus (?) nordenskioldii (Hulke). Pelvic ar
. Bulletin of the Department of Geology. Geology. 1911] Merriam: Saurian Fauna of Spitzbergen. 321 the Italian specimens thus far described in possessing a sixth digit. The first three segments of the anterior limbs are prac- tically identical with those of Cymbospondylus(l) natans, a Mixosaurus-like species from the Middle Triassic of Nevada. The posterior limb (fig. 4) is almost identical in form with that of Mixosaurus cornalianus, even to the duplication of a peculiar arrangement of the proximal carpals found in the Italian Pig. 4. Mixosaurus (?) nordenskioldii (Hulke). Pelvic arch and pos- terior limb, X %. P, pubis; I, ischium. (After Wiman.) The pelvic arch (fig. 4) is almost identical with that in most specimens of the American Cymbospondylus, and differs from that of Mixosaurus in the absence of an obturator foramen in the pubis. The pectoral arch is like that of Mixosaurus excepting in the form of the interclaviele, which has a remarkably wide trian- gular form with a distinct reentrant angle on the anterior side. The complete vertebral column is not known, but fortunately considerable numbers of vertebrae, including the posterior dorsal region and a large part of the tail, were found in a continuous series (fig. 5). As in Mixosaurus cornalianus, the tail makes a gentle upward curve near the middle and droops slightly at the posterior end. In the Spitzbergen form as represented in the specimen figured by Wiman the upward curve is much nearer the dorsal region than in M. cornalianus; in contrast to Cymbos- pondylus, in which the curve is farther back than in the Italian Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original University of California, Berkeley. Dept. of Geology. Berkeley : The University Press
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