Syncyclonema operculiformis (Gabb, 1864)
GABB, W. M. 1864. Paleontology of California. Volume I. Description of the Cretaceous fossils. Geological Survey of California. Paleontology Vol I, Section IV: 57-217, pls. 9-32. [p. 201, pl. 26; fig. 188]
1864 Pecten operculiformis Gabb, 1864
W. M. Gabb, 1864, plate 26.
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«SHELL very much compressed, lenticular; basal half of the outline elongated, subsemicircular above; sides converging, straight. Left valve, auricles equal, outer margins converging, upper edges inclined upwards from the beak. Surface polished, showing under a glass minute, equal, concentric ribs. Eight valve unknown.
Figure, natural size.
Localities: Cottonwood and Huling Creeks, Shasta County; and Curry's, south of Mount Diablo (Division A.). This shell is allied to P. orbicularis, Sow. (P. laminosus, Mant.); but is proportionally longer, the ears are equal and narrower, and the concentric lamellae are very much smaller, being invisible to the naked eye.» WILLIAM MORE GABB, 1864
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